G. W. Perry and J.-P. St.-Maurice. A Polar-Cap Patch Detection Algorithm for the Advanced Modular Incoherent Scatter Radar System. Radio Science, volume 53, issue 10,  2018 .

S. Zou, A. Ridley, X. Jia, E. Boyd, M. Nicolls, A. Coster, E. Thomas, and J. M. Ruohoniemi. PFISR observation of intense ion upflow fluxes associated with an SED during the 1 June 2013 geomagnetic storm. J. Geophys. Res. Space Physics, American Geophysical Union, issue 122,  2017 .

R. B. Cosgrove. Does a localized plasma disturbance in the ionosphere evolve to electrostatic equilibrium? Evidence to the contrary. J. Geophys. Res. Space Physics, American Geophysical Union, issue 121,  2016 .

P. A. Fernandes, K. A. Lynch, M. Zettergren, D. L. Hampton, T. A. Bekkeng, I. J. Cohen, M. Conde, L. E. Fisher, P. Horak, M. R. Lessard, R. J. Miceli, R. G. Michell, J. I. Moen, and S. P. Powell. Measuring the seeds of ion outflow: Auroral sounding rocket observations of low-altitude ion heating and circulation. J. Geophys. Res., volume 121, pages 1587-1607,  2016 .

T. E. Moore, K. S. Brenneman, C. R. Chappell, J. H. Clemmons, G. A. Collinson, C. Cully, E. Donovan, G. D. Earle, D. J. Gershman, R. A. Heelis, L. M. Kistler, L. Kepko, G. Khazanov, D. J. Knudsen, M. Lessard, E. A. MacDonald, M. J. Nicolls, C. J. Pollock, R. Pfaff, D. E. Rowland, E. Sanchez, R. W. Schunk, J. Semeter, R. J. Stangeway, and J. Thayer. Future Atmosphere-Ionosphere-Magnetosphere Coupling Study Requirements. Magnetosphere-Ionosphere Coupling in the Solar System, American Geophysical Union, October  2016 .

H. Akbari, J. L. Semeter, M. A. Hirsch, P. Guio, and M. J. Nicolls. Evidence for generation of unstable suprathermal electron population in the auroral F-region. Geophys. Res. Lett., Geophys. Res. Lett., volume 42, pages 185-192,  2015 .

S. Datta-Barua, Y. Su, K. Deshpande, D. Miladinovich, G. S. Bust, D. Hampton, and G. Crowley. First light from a kilometer-baseline Scintillation Auroral GPS Array. Geophys. Res. Lett., volume 42, pages 3639-3646,  2015 .

D. A. Hickey, C. R. Martinis, F. S. Rodrigues, R. H. Varney, M. A. Milla, M. J. Nicolls, A. Strømme, and J. F. Arratia. Concurrent observations at the magnetic equator of small-scale irregularities and large-scale depletions associated with equatorial spread F. J. Geophys. Res., volume 120, pages 10883-10896,  2015 .

S. R. Kaeppler, D. L. Hampton, M. J. Nicolls, A. Strømme, S. C. Solomon, J. H. Hecht, and M. G. Conde. An investigation comparing ground-based techniques that quantify auroral electron flux and conductance. J. Geophys. Res. Space Physics, volume 120, pages 9038-9056,  2015 .

L. J. Lamarche and R. A. Makarevich. Solar control of F region radar backscatter: Further insights from observations in the southern polar cap. J. Geophys. Res., volume 120,  2015 .

J. Liu, T. Nakamura, L. Liu, W. Wang, N. Balan, T. Nishiyama, M. R. Hairston, and E. G. Thomas. Formation of polar ionospheric tongue of ionization during minor geomagnetic disturbed conditions. J. Geophys. Res., volume 120, issue 8, pages 6860-6873,  2015 .

L. R. Liuzzo, A. J. Ridley, N. J. Perlongo, E. J. Mitchell, M. Conde, D. L. Hampton, W. A. Bristow, and M. J. Nicolls. High-latitude ionospheric drivers and their effects on wind patterns in the thermosphere. J. Geophys. Res., volume 120, pages 715-735,  2015 .

K. A. Lynch, D. L. Hampton, M. Zettergren, T. A. Bekkeng, M. Conde, P. A. Fernandes, P. Horak, M. Lessard, R. Miceli, R. Michell, J. Moen, M. Nicolls, S. P. Powell, and M. Samara. MICA sounding rocket observations of conductivity-gradient-generated auroral ionospheric responses: Small-scale structure with large-scale drivers. J. Geophys. Res. Space Physics, volume 120, pages 9661-9682,  2015 .

L. R. Lyons, Y. Nishimura, B. Gallardo-Lacourt, M. J. Nicolls, S. Chen, D. L. Hampton, W. A. Bristow, J. M. Ruohoniemi, N. Nishitani, E. F. Donovan, and V. Angelopoulos. Azimuthal flow bursts in the Inner Plasma Sheet and Possible Connection with SAPS and Plasma Sheet Earthward Flow Bursts. J. Geophys. Res., volume 120, pages 5009-5021,  2015 .

R. A. Makarevich, L. J. Lamarche, and M. J. Nicolls. Resolute Bay Incoherent Scatter Radar observations of plasma structures in the vicinity of polar holes. J. Geophys. Res., volume 120, issue 9, pages 7970-7986,  2015 .

R. A. Makarevich and W. A. Bristow. Coordinated radar observations of plasma wave characteristics in the auroral F region. Ann. Geophys., volume 32, issue 7, pages 875-888,  2015 .

M. J. Nicolls.  Space Debris Measurements using the Advanced Modular Incoherent Scatter Radar. AMOS,  2015 .

G. W. Perry, H. Dahlgren, M. J. Nicolls, M. Zettergren, J.-P. St.-Maurice, J. L. Semeter, T. Sundberg, K. Hosokawa, K. Shiokawa, and S. Chen. Spatiotemporally resolved electrodynamic properties of a Sun-aligned arc over Resolute Bay. J. Geophys. Res., volume 120, pages 9977-9987,  2015 .

G. Perry. Large scale plasma density perturbations in the polar F-region ionosphere. Ph.D. Thesis, University of Saskatchewan,  2015 .

F. S. Rodrigues., M. J. Nicolls, M. A. Milla, J. M. Smith, R. H. Varney, A. Strømme, C. Martinis, and J. F. Arratia. AMISR-14: Observations of equatorial spread F. Geophys. Res. Lett., volume 42, pages 5100-5108,  2015 .

D. R. Themens, P. T. Jayachandran, and R. B. Langley. The nature of GPS differential receiver bias variability: An examination in the polar cap region. J. Geophys. Res., volume 120, pages 8155-8175,  2015 .

H. Akbari and J. L. Semeter. Aspect angle dependence of naturally enhanced ion acoustic lines. J. Geophys. Res., volume 119,  2014 .

H. Bahcivan, J. W. Cutler, J. C. Springmann, R. Doe, and M. J. Nicolls. Magnetic aspect sensitivity of high-latitude E region irregularities measured by the RAX CubeSat. J. Geophys. Res., volume 119, pages 1233-1249,  2014 .

M. Broughton. Ground and Space Observations of Auroral Medium Frequency Radio Emissions. Ph.D. Thesis, Dartmouth College,  2014 .

H. Dahlgren, G. Perry, J.-P. St.-Maurice, T. Sundberg, K. Hosokawa, J. L. Semeter, M. J. Nicolls, and K. Shiokawa. 3D imaging reveals electrodynamics of polar cap aurora. Astronomy & Geophysics, volume 55,  2014 .

L. Goodwin, J.-P. St.-Maurice, P. Richards, M. Hairston, and M. Nicolls. F region dusk ion temperature spikes at the equatorward edge of the high latitude convection pattern. Geophys. Res. Lett., volume 41, pages 300-307,  2014 .

K. Gudivada. Detection of F-region electron density irregularities using incoherent-scatter radar. Master's Thesis, University of Alaska Fairbanks,  2014 .

K. Hosokawa, S. Taguchi, K. Shiokawa, Y. Otsuka, Y. Ogawa, and M. Nicolls. Global imaging of polar cap patches with dual airglow imagers. Geophys. Res. Lett., volume 41, pages 1-6,  2014 .

D. Janches, N. Swarnalingam, J. Plane, D. Nesvorny, W. Feng, D. Vokrouhlicky, and M. Nicolls. Radar detectability studies of slow and small Zodiacal Dust Cloud Particles: II. A study of three radars with dierent sensitivity. The Astrophysical Journal, volume 796, issue 41,  2014 .

S. R. Kaeppler, M. J. Nicolls, A. Strømme, C. A. Kletzing, and S. R. Bounds. Observations in the E-region ionosphere of kappa distribution functions associated with precipitating auroral electrons and discrete aurorae. J. Geophys. Res., volume 119, pages 10164-10183,  2014 .

M. J. Nicolls, H. Bahcivan, I. Haggstrom, and M. Rietveld. Direct Measurement of Lower-Thermospheric Neutral Density using Multi-Frequency Incoherent Scattering. Geophys. Res. Lett., volume 41, issue 2, pages 8147-8154,  2014 .

M. J. Nicolls, R. Cosgrove, and H. Bahcivan. Estimating the vector electric field using monostatic, multibeam incoherent scatter radar measurements. Radio Sci., volume 49, pages 1124-1139,  2014 .

Y. Nishimura, L. R. Lyons, M. J. Nicolls, D. L. Hampton, R. G. Michell, M. Samara, W. A. Bristow, E. F. Donovan, E. Spanswick, V. Angelopoulos, and S. B. Mende. Coordinated ionospheric observations indicating coupling between pre-onset flow bursts and waves that leads to substorm onset. J. Geophys. Res., volume 119, pages 3333-3344,  2014 .

D. L. Oltrogge, P. North, and M. J. Nicolls. MULTI-PHENOMENOLOGY OBSERVATION NETWORK EVALUATION TOOL (MONET). AMOS,  2014 .

P. G. Richards, M. J. Nicolls, J.-P. St.-Maurice, L. Goodwin, and J. M. Ruohoniemi. Investigation of sudden electron density depletions observed in the dusk sector by the Poker Flat, Alaska incoherent scatter radar in summer. J. Geophys. Res., volume 119, pages 10608-10620,  2014 .

J. J. Sojka, R. W. Schunk, and M. J. Nicolls. Ionospheric Ion Temperature Forecasting in Multiples of 27 Days. Space Weather, volume 12, pages 148-160,  2014 .

D. Themens, P. Jayachandran, M. J. Nicolls, and J. W. MacDougall. A Top to Bottom Evaluation of IRI-2007 within the Polar Cap. J. Geophys. Res., volume 119,  2014 .

R. H. Varney, S. C. Solomon, and M. J. Nicolls. Heating of the sunlit polar cap ionosphere by reflected photoelectrons. J. Geophys. Res., volume 119, pages 8660-8684,  2014 .

R. L. Whittier. Poker Flat Incoherent Scatter Radar investigations of the nighttime E-region. Master's Thesis, Univ. of Alaska Fairbanks, Fairbanks, Alaska, USA,  2014 .

M. Zettergren, K. Lynch, D. Hampton, M. Nicolls, B. Wright, M. Conde, J. Moen, M. Lessard, R. Miceli, and S. Powell. Auroral ionospheric F region density cavity formation and evolution: MICA campaign results. J. Geophys. Res., volume 119, pages 3162-3178,  2014 .

S. Zou, M. B. Moldwin, A. J. Ridley, M. J. Nicolls, A. J. Coster, E. G. Thomas, and J. M. Ruohoniemi. On the generation/decay of the storm-enhanced density plumes: Role of the convection flow and field-aligned ion flow. J. Geophys. Res.,  2014 .

H. Akbari, J. L. Semeter, M. J. Nicolls, M. Broughton, and J. W. LaBelle. On the localization of auroral Langmuir turbulence in thin layers. J. Geophys. Res., volume 118, pages 3576-3583,  2013 .

C. Anderson, M. J. Kosch, M. J. Nicolls, and M. Conde. Ion-neutral coupling in Earth's thermosphere, estimated from concurrent radar and optical observations over Alaska. J. Atmos. Solar-Terr. Phys., pages 313-324,  2013 .

H. Bahcivan, M. J. Nicolls, and G. Perry. Comparison of SuperDARN irregularity drift measurements and F-region ion velocities from the Resolute Bay ISR. J. Atmos. Solar-Terr. Phys., pages 325-331,  2013 .

H. Bahcivan, S. Chen, and R. Cosgrove. Comparison of ionospheric drift and magnetic deflections on the ground. J. Atmos. Solar-Terr. Phys., pages 332-335,  2013 .

T. W. Butler. SPATIAL STATISTICS AND ANALYSIS OF EARTH'S IONOSPHERE. Ph.D. Thesis, Boston University,  2013 .

C. T. Fallen and B. J. Watkins. Diurnal and seasonal variation of electron heat flux measured with the Poker Flat Incoherent-Scatter Radar. J. Geophys. Res., volume 118, issue 8, pages 5327-5332,  2013 .

R. A. Makarevich, A. V. Koustov, and M. J. Nicolls. Poker Flat Incoherent Scatter Radar observations of anomalous electron heating in the E-region. Ann. Geophys., volume 31, pages 1163-1176,  2013 .

R. A. Makarevich and M. J. Nicolls. Statistical comparison of TEC derived from GPS and ISR observations at high latitudes. Radio Sci., volume 48, pages 441-452,  2013 .

R. Michell and M. Samara. Observability of NEIALs with the Sondrestrom and Poker Flat incoherent scatter radars. J. Atmos. Solar-Terr. Phys., pages 299-307,  2013 .

L. A. Rooker, M. C. Lee, R. Pradipta, and B. J. Watkins. Generation and detection of whistler wave induced space plasma turbulence at Gakona, Alaska. Physica Scripta, volume 155,  2013 .

M. Samara and R. Michell. Optical and radar observations of small-scale polar cap auroral structures. J. Atmos. Solar-Terr. Phys., pages 308-312,  2013 .

E. Sergeev, S. Grach, A. Shindin, E. Mishin, P. Bernhardt, S. Briczinski, B. Isham, M. Broughton, J. LaBelle, and B. Watkins. Artificial Ionospheric Layers during Pump Frequency Stepping Near the 4th Gyroharmonic at HAARP. Phys. Rev. Lett., volume 110, issue 6,  2013 .

T. Valentic, J. Buonocore, M. Cousins, C. Heinselman, J. Jorgensen, J. Kelly, M. Malone, M. Nicolls, and A. van Eyken. AMISR: The Advanced Modular Incoherent Scatter Radar. 2013 IEEE International Symposium on Phased Array Systems and Technology,  2013 .

J. Yee and S. Close. Plasma turbulence of nonspecular trail plasmas as measured by a high-power large-aperture radar. J. Geophys. Res., volume 118, issue 24, pages 13449-13462,  2013 .

S. Zou, A. Ridley, M. Moldwin, M. Nicolls, A. Coster, and M. Ruohoniemi. Multi-instrument Observations of Storm Enhanced Density (SED) during Oct. 24-25 2011 Storm: Implications for SED Formation Processes. J. Geophys. Res., volume 118, pages 7798-7809,  2013 .

S. Zou, M. B. Moldwin, M. J. Nicolls, A. J. Ridley, A. J. Coster, E. Yizengaw, L. R. Lyons, and E. F. Donovan. Electrodynamics of the high-latitude trough: its relationship with convection flows and field-aligned currents. J. Geophys. Res., volume 118, pages 2565-2572,  2013 .

H. Akbari, J. L. Semeter, H. Dahlgren, M. Diaz, M. Zettergren, A. Strømme, M. J. Nicolls, and C. Heinselman. Anomalous ISR echoes preceding auroral breakup: Evidence for strong Langmuir turbulence. Geophys. Res. Lett., volume 39,  2012 .

H. Bahcivan and J. W. Cutler. Radio Aurora Explorer: Mission science and radar system. Radio Sci., volume 47,  2012 .

H. Bahcivan, J. W. Cutler, M. Bennett, B. Kempke, J. C. Springmann, J. Buonocore, M. Nicolls, and R. Doe. First measurements of radar coherent scatter by the Radio Aurora Explorer CubeSat. Geophys. Res. Lett., volume 39,  2012 .

J. K. Burchill, J. H. Clemmons, D. J. Knudsen, M. Larsen, M. J. Nicolls, R. F. Pfaff, D. Rowland, and L. Sangalli. High-latitude E region ionosphere-thermosphere coupling: A comparative study using in situ and incoherent scatter radar observations. J. Geophys. Res., volume 117,  2012 .

H. Dahlgren, G. W. Perry, J. L. Semeter, J.-P. St.-Maurice, K. Hosokawa, M. J. Nicolls, M. Greffen, K. Shiokawa, and C. Heinselman. Space-time variability of polar cap patches: Direct evidence for internal plasma structuring. J. Geophys. Res., volume 117,  2012 .

H. Dahlgren, J. L. Semeter, K. Hosokawa, M. J. Nicolls, T. W. Butler, M. G. Johnsen, K. Shiokawa, and C. Heinselman. Direct three-dimensional imaging of polar ionospheric structures with the Resolute Bay Incoherent Scatter Radar. Geophys. Res. Lett., volume 39,  2012 .

J. T. Fentzke, V. Hsu, C. G. M. Brum, I. Strelnikova, M. Rapp, and M. Nicolls. D region meteoric smoke and neutral temperature retrieval using the poker flat incoherent scatter radar. Geophys. Res. Lett., volume 39, issue 21,  2012 .

D. Hysell, R. Miceli, J. Munk, D. Hampton, C. Heinselman, M. Nicolls, S. Powell, K. Lynch, and M. Lessard. Comparing VHF coherent scatter from the radar aurora with incoherent scatter and all-sky auroral imagery. J. Geophys. Res., volume 117,  2012 .

T. B. Leyser, F. Waldemarsson, and S. C. Buchert. Plasma angular momentum effects and twisted incoherent scatter radar beams. Radio Sci., volume 47, issue 5,  2012 .

K. A. Lynch, D. Hampton, M. Mella, B. Zhang, H. Dahlgren, M. Disbrow, P. M. Kintner, M. Lessard, E. Lundberg, and H. C. Stenbaek-Nielsen. Structure and dynamics of the nightside poleward boundary: Sounding rocket and ground-based observations of auroral electron precipitation in a rayed curtain. J. Geophys. Res., volume 117,  2012 .

M. J. Nicolls, S. L. Vadas, J. W. Meriwether, M. G. Conde, and D. Hampton. The phases and amplitudes of gravity waves propagating and dissipating in the thermosphere: Application to measurements over Alaska. J. Geophys. Res., volume 117,  2012 .

M. J. Nicolls, D. C. Fritts, D. Janches, and C. J. Heinselman. Momentum flux determination using the multi-beam Poker Flat Incoherent Scatter Radar. Ann. Geophys., volume 30, issue 6, pages 945-962,  2012 .

T. Nishiyama, T. Sakanoi, Y. Miyoshi, R. Kataoka, D. L. Hampton, Y. Katoh, K. Asamura, and S. Okano. Fine scale structures of pulsating auroras in the early recovery phase of substorm using ground-based EMCCD camera. J. Geophys. Res., volume 117,  2012 .

D. R. Themens, P. T. Jayachandran, R. B. Langley, J. W. Macdougall, and M. J. Nicolls. Determining receiver biases in GPS-derived total electron content in the auroral oval and polar cap region using ionosonde measurements. GPS Solutions,  2012 .

S. L. Vadas and M. J. Nicolls. The phases and amplitudes of gravity waves propagating and dissipating in the thermosphere: Theory. J. Geophys. Res., volume 117,  2012 .

R. Volz and S. Close. Inverse filtering of radar signals using compressed sensing with application to meteors. Radio Sci., volume 47,  2012 .

T. W. Garner, R. B. Harris, J. A. York, C. S. Herbster, C. F. I. Minter, and D. L. Hampton. An auroral scintillation observation using precise, collocated GPS receivers. Radio Sci., volume 46, issue 1,  2011 .

J. Liang, E. Spanswick, M. J. Nicolls, E. F. Donovan, D. Lummerzheim, and W. W. Liu. Multi-instrument observations of soft electron precipitation and its association with magnetospheric flows. J. Geophys. Res., volume 116,  2011 .

L. R. Lyons, Y. Nishimura, H.-J. Kim, E. Donovan, V. Angelopoulos, G. Sofko, M. Nicolls, C. Heinselman, J. M. Ruohoniemi, and N. Nishitani. Possible connection of polar cap flows to pre- and post-substorm onset PBIs and streamers. J. Geophys. Res., volume 116,  2011 .

M. R. Mella, K. A. Lynch, D. L. Hampton, H. Dahlgren, P. M. Kintner, M. Lessard, D. Lummerzheim, E. T. Lundberg, M. J. Nicolls, and H. C. Stenbaek-Nielsen. Sounding rocket study of two sequential auroral poleward boundary intensifications. J. Geophys. Res., volume 116,  2011 .

T. Pedersen, M. McCarrick, B. Reinisch, B. Watkins, R. Hamel, and V. Paznukhov. Production of artificial ionospheric layers by frequency sweeping near the 2nd gyroharmonic. Ann. Geophys., volume 29, issue 1, pages 47-51,  2011 .

J. J. Sojka, M. Nicolls, A. van Eyken, C. Heinselman, and D. Bilitza. 24/7 Solar minimum polar cap and auroral ion temperature observations. Advances in Space Research, volume 48,  2011 .

R. H. Varney, M. C. Kelley, M. J. Nicolls, C. J. Heinselman, and R. L. Collins. The electron density dependence of polar mesospheric summer echoes. J Atmos Sol-Terr Phy, volume 73,  2011 .

S. Zou, M. B. Moldwin, A. Coster, L. R. Lyons, and M. J. Nicolls. GPS TEC observations of dynamics of the mid-latitude trough during substorms. Geophys. Res. Lett., volume 38,  2011 .

H. Bahcivan, R. Tsunoda, M. J. Nicolls, and C. J. Heinselman. Initial ionospheric observations made by the new Resolute incoherent scatter radar and comparison to solar wind IMF. Geophys. Res. Lett., volume 37,  2010 .

T. W. Butler, J. Semeter, C. J. Heinselman, and M. J. Nicolls. Imaging F region drifts using monostatic phased-array incoherent scatter radar. Radio Sci., volume 45,  2010 .

J. A. Cohen, R. Pradipta, L. M. Burton, A. Labno, M. C. Lee, B. J. Watkins, C. Fallen, S. P. Kuo, W. J. Burke, D. Mabius, and B. Z. See. Generation of ionospheric ducts by the HAARP HF heater. Physica Scripta, volume 142,  2010 .

M. G. Conde and M. J. Nicolls. Thermospheric temperatures above Poker Flat, Alaska, during the stratospheric warming event of January and February 2009. J. Geophys. Res., volume 115,  2010 .

R. Cosgrove, M. Nicolls, H. Dahlgren, S. Ranjan, E. Sanchez, and R. Doe. Radar detection of a localized 1.4 Hz pulsation in auroral plasma, simultaneous with pulsating optical emissions, during a substorm. Ann Geophys, volume 28,  2010 .

M. C. Kelley, M. J. Nicolls, R. H. Varney, R. L. Collins, R. Doe, J. M. C. Plane, J. Thayer, M. Taylor, B. Thurairajah, and K. Mizutani. Radar, lidar, and optical observations in the polar summer mesosphere shortly after a space shuttle launch. J. Geophys. Res., volume 115,  2010 .

L. R. Lyons, Y. Nishimura, Y. Shi, S. Zou, H.-J. Kim, V. Angelopoulos, C. Heinselman, M. J. Nicolls, and K.-H. Fornacon. Substorm triggering by new plasma intrusion: Incoherent-scatter radar observations. J. Geophys. Res., volume 115,  2010 .

R. G. Michell and M. Samara. High-resolution observations of naturally enhanced ion acoustic lines and accompanying auroral fine structures. J. Geophys. Res., volume 115,  2010 .

R. G. Michell. Simultaneous optical and radar measurements of meteors using the Poker Flat Incoherent Scatter Radar. J Atmos Sol-Terr Phy, volume 72,  2010 .

M. J. Nicolls, R. H. Varney, S. L. Vadas, P. A. Stamus, C. J. Heinselman, R. B. Cosgrove, and M. C. Kelley. Influence of an inertia-gravity wave on mesospheric dynamics: A case study with the Poker Flat Incoherent Scatter Radar. J. Geophys. Res., volume 115,  2010 .

Y. Nishimura, L. R. Lyons, S. Zou, X. Xing, V. Angelopoulos, S. B. Mende, J. W. Bonnell, D. Larson, U. Auster, T. Hori, N. Nishitani, K. Hosokawa, G. Sofko, M. Nicolls, and C. Heinselman. Preonset time sequence of auroral substorms: Coordinated observations by all-sky imagers, satellites, and radars. J. Geophys. Res., volume 115,  2010 .

M. Samara and R. G. Michell. Ground-based observations of diffuse auroral frequencies in the context of whistler mode chorus. J. Geophys. Res., volume 115,  2010 .

J. Semeter, T. W. Butler, M. Zettergren, C. J. Heinselman, and M. J. Nicolls. Composite imaging of auroral forms and convective flows during a substorm cycle. J. Geophys. Res., volume 115,  2010 .

J. J. Sparks, D. Janches, M. J. Nicolls, and C. Heinselman. Determination of physical and radiant meteor properties using PFISR interferometry measurements of head echoes. J Atmos Sol-Terr Phy, volume 72,  2010 .

S.-R. Zhang, J. M. Holt, A. P. van Eyken, C. Heinselman, and M. McCready. IPY observations of ionospheric yearly variations from high- to middle-latitude incoherent scatter radars. J. Geophys. Res., volume 115,  2010 .

S. Zou, M. B. Moldwin, L. R. Lyons, Y. Nishimura, M. Hirahara, T. Sakanoi, K. Asamura, M. J. Nicolls, Y. Miyashita, S. B. Mende, and C. J. Heinselman. Identification of substorm onset location and preonset sequence using Reimei, THEMIS GBO, PFISR, and Geotail. J. Geophys. Res., volume 115,  2010 .

H. Bahcivan, M. C. Kelley, and J. W. Cutler. Radar and rocket comparison of UHF radar scattering from auroral electrojet irregularities: Implications for a nanosatellite radar. J. Geophys. Res., volume 114,  2009 .

J. L. Chau, F. R. Galindo, C. J. Heinselman, and M. J. Nicolls. Meteor-head echo observations using an antenna compression approach with the 450 MHz Poker Flat Incoherent Scatter Radar. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 636-643,  2009 .

J. T. Fentzke, D. Janches, and J. J. Sparks. Latitudinal and seasonal variability of the micrometeor input function: A study using model predictions and observations from Arecibo and PFISR. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 653-661,  2009 .

B. Gustavsson, R. Newsome, T. B. Leyser, M. J. Kosch, L. Norin, M. McCarrick, T. Pedersen, and B. J. Watkins. First observations of X-mode suppression of O-mode HF enhancements at 6300 A . Geophys. Res. Lett., volume 36,  2009 .

D. L. Hysell, G. Michhue, M. J. Nicolls, C. J. Heinselman, and M. F. Larsen. Assessing auroral electric field variance with coherent and incoherent scatter radar. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 697-707,  2009 .

D. Janches, D. C. Fritts, M. J. Nicolls, and C. J. Heinselman. Observations of D-region structure and atmospheric tides with PFISR during active aurora. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 688-696,  2009 .

S. L. Jones, M. R. Lessard, P. A. Fernandes, D. Lummerzheim, J. L. Semeter, C. J. Heinselman, K. A. Lynch, R. G. Michell, P. M. Kintner, H. C. Stenbaek-Nielsen, and K. Asamura. PFISR and ROPA observations of pulsating aurora. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 708-716,  2009 .

J. D. Kelly and C. J. Heinselman. Initial results from Poker Flat Incoherent Scatter Radar (PFISR). J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 635,  2009 .

M. J. Kosch, B. Gustavsson, C. Heinselman, T. Pedersen, M. T. Rietveld, J. Spaleta, A. Wong, W. Wang, C. Mutiso, B. Bristow, and J. Hughes. First incoherent scatter radar observations of ionospheric heating on the second electron gyro-harmonic. J. Atmos Solar-Terr. Phys., volume 71, issue 1, pages 1959-1966,  2009 .

D. J. Livneh, I. Seker, F. T. Djuth, and J. D. Mathews. Omnipresent vertically coherent fluctuations in the ionosphere with a possible worldwide-midlatitude extent. J. Geophys. Res., volume 114,  2009 .

L. R. Lyons, S. Zou, C. J. Heinselman, M. J. Nicolls, and P. C. Anderson. Poker flat radar observations of the magnetosphere-ionosphere coupling electrodynamics of the earthward penetrating plasma sheet following convection enhancements. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 717-728,  2009 .

L. R. Lyons, H.-J. Kim, X. Xing, S. Zou, D.-Y. Lee, C. Heinselman, M. J. Nicolls, V. Angelopoulos, D. Larson, J. McFadden, A. Runov, and K.-H. Fornacon. Evidence that solar wind fluctuations substantially affect global convection and substorm occurrence. J. Geophys. Res., volume 114,  2009 .

R. G. Michell, K. A. Lynch, C. J. Heinselman, and H. C. Stenbaek-Nielsen. High time resolution PFISR and optical observations of naturally enhanced ion acoustic lines. Ann. Geophys., volume 27, issue 4, pages 1457-1467,  2009 .

M. J. Nicolls, M. C. Kelley, R. H. Varney, and C. J. Heinselman. Spectral observations of polar mesospheric summer echoes at 33 cm (450 MHz) with the Poker Flat Incoherent Scatter Radar. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 662-674,  2009 .

E. Nossa, D. L. Hysell, C. T. Fallen, and B. J. Watkins. Radar observations of artificial E-region field-aligned irregularities. Ann. Geophys., volume 27, issue 7, pages 2699-2710,  2009 .

P. G. Richards, M. J. Nicolls, C. J. Heinselman, J. J. Sojka, J. M. Holt, and R. R. Meier. Measured and modeled ionospheric densities, temperatures, and winds during the international polar year. J. Geophys. Res., volume 114,  2009 .

A. Roy, S. J. Briczinski, J. F. Doherty, and J. D. Mathews. Genetic-Algorithm-Based Parameter Estimation Technique for Fragmenting Radar Meteor Head Echoes. IEEE Geoscience and Remote Sensing Letters, volume 6, pages 363-367,  2009 .

L. Sangalli. SOUNDING ROCKET PROBING OF THE IONOSPHERIC COLLISIONAL TRANSITION REGION. Ph.D. Thesis, University of Calgary,  2009 .

L. Sangalli, D. J. Knudsen, M. F. Larsen, T. Zhan, R. F. Pfaff, and D. Rowland. Rocket-based measurements of ion velocity, neutral wind, and electric field in the collisional transition region of the auroral ionosphere. J. Geophys. Res., volume 114,  2009 .

J. Semeter, T. Butler, C. Heinselman, M. Nicolls, J. Kelly, and D. Hampton. Volumetric imaging of the auroral ionosphere: Initial results from PFISR. J. Atmos Solar-Terr. Phys., volume 71, issue 6, pages 738-743,  2009 .

J. J. Sojka, M. J. Nicolls, C. J. Heinselman, and J. D. Kelly. The PFISR IPY observations of ionospheric climate and weather. J. Atmos. Solar-Terr. Phys., volume 71, issue 6, pages 771-785,  2009 .

J. J. Sojka, R. L. McPherron, A. P. van Eyken, M. J. Nicolls, C. J. Heinselman, and J. D. Kelly. Observations of ionospheric heating during the passage of solar coronal hole fast streams. Geophys. Res. Lett., volume 36, issue 1,  2009 .

J. J. Sparks, D. Janches, M. J. Nicolls, and C. J. Heinselman. Seasonal and diurnal variability of the meteor flux at high latitudes observed using PFISR. J. Atmos. Solar-Terr. Phys., volume 71, issue 6, pages 644-652,  2009 .

J. J. Sparks and D. Janches. Correction to “Latitudinal dependence of the variability of the micrometeor altitude distribution”. Geophys. Res. Lett., volume 36, issue 1,  2009 .

J. J. Sparks and D. Janches. Latitudinal dependence of the variability of the micrometeor altitude distribution. Geophys. Res. Lett., volume 36,  2009 .

M. J. Taylor, Y. Zhao, P.-D. Pautet, M. J. Nicolls, R. L. Collins, J. Barker-Tvedtnes, C. D. Burton, B. Thurairajah, J. Reimuller, R. H. Varney, C. J. Heinselman, and K. Mizutani. Coordinated optical and radar image measurements of noctilucent clouds and polar mesospheric summer echoes. J. Atmos. Solar-Terr. Phys., volume 71, issue 6, pages 675-687,  2009 .

S. L. Vadas and M. J. Nicolls. Temporal evolution of neutral, thermospheric winds and plasma response using PFISR measurements of gravity waves. J. Atmos. Solar-Terr. Phys., volume 71, issue 6, pages 744-770,  2009 .

R. H. Varney, M. J. Nicolls, C. J. Heinselman, and M. C. Kelley. Observations of polar mesospheric summer echoes using PFISR during the summer of 2007. J. Atmos. Solar-Terr. Phys., volume 71, issue 3, pages 470-476,  2009 .

S. Zou, L. R. Lyons, M. J. Nicolls, C. J. Heinselman, and S. B. Mende. Nightside ionospheric electrodynamics associated with substorms: PFISR and THEMIS ASI observations. J. Geophys. Res., volume 114,  2009 .

S. Zou, L. R. Lyons, M. J. Nicolls, and C. J. Heinselman. PFISR observations of strong azimuthal flow bursts in the ionosphere and their relation to nightside aurora. J. Atmos. Solar-Terr. Phys., volume 71, issue 6, pages 729-737,  2009 .

L. M. Burton, J. A. Cohen, R. Pradipta, A. Labno, M. C. Lee, O. Batishchev, D. L. Rokusek, S. P. Kuo, B. J. Watkins, and S. Oyama. Excitation and diagnosis of cascading Langmuir waves in ionospheric plasmas at Gakona, Alaska. Physica Scripta, volume 132,  2008 .

B. Gustavsson, M. Kosch, A. Wong, T. Pedersen, C. Heinselman, C. Mutiso, B. Bristow, J. Hughes, and W. Wang. First estimates of volume distribution of HF-pump enhanced emissions at 6300 and 5577 Å: a comparison between observations and theory. Ann. Geophys., volume 26, issue 1, pages 3999-4012,  2008 .

C. J. Heinselman and M. J. Nicolls. A Bayesian approach to electric field and E-region neutral wind estimation with the Poker Flat Advanced Modular Incoherent Scatter Radar. Radio Sci., volume 43, issue 5,  2008 .

D. L. Hysell, G. Michhue, M. F. Larsen, R. Pfaff, M. Nicolls, C. Heinselman, and H. Bahcivan. Imaging radar observations of Farley Buneman waves during the JOULE II experiment. Ann. Geophys., volume 26, issue 7, pages 1837-1850,  2008 .

L. M. Kagan, R. S. Kissack, M. C. Kelley, and R. Cuevas. Unexpected rapid decrease in phase velocity of submeter Farley-Buneman waves with altitude. Geophys. Res. Lett., volume 35, issue 3,  2008 .

M. C. Kelley, R. A. Cuevas, and D. L. Hysell. Radar scatter from equatorial electrojet waves: An explanation for the constancy of the Type I Doppler shift with zenith angle. Geophys. Res. Lett., volume 35,  2008 .

J. D. Mathews, S. J. Briczinski, D. D. Meisel, and C. J. Heinselman. Radio and Meteor Science Outcomes From Comparisons of Meteor Radar Observations at AMISR Poker Flat, Sondrestrom, and Arecibo. Earth Moon Planet, volume 102, pages 365-372,  2008 .

R. G. Michell, K. A. Lynch, C. J. Heinselman, and H. C. Stenbaek-Nielsen. PFISR nightside observations of naturally enhanced ion acoustic lines, and their relation to boundary auroral features. Ann. Geophys., volume 26, issue 1, pages 3623-3639,  2008 .

I. Sandahl, T. Sergienko, and U. Brändström. Fine structure of optical aurora. J. Atmos. Solar-Terr. Phys., volume 70, issue 1, pages 2275-2292,  2008 .

S. L. Vadas and M. J. Nicolls. Using PFISR measurements and gravity wave dissipative theory to determine the neutral, background thermospheric winds. Geophys. Res. Lett., volume 35, issue 2,  2008 .

D. L. Hysell, J. Drexler, E. B. Shume, J. L. Chau, D. E. Scipion, M. Vlasov, R. Cuevas, and C. Heinselman. Combined radar observations of equatorial electrojet irregularities at Jicamarca. Ann. Geophys., volume 25, issue 2, pages 457-473,  2007 .

M. J. Kosch, T. Pedersen, E. Mishin, S. Oyama, J. Hughes, A. Senior, B. Watkins, and B. Bristow. Coordinated optical and radar observations of ionospheric pumping for a frequency pass through the second electron gyroharmonic at HAARP. J. Geophys. Res., volume 112,  2007 .

M. J. Kosch, T. Pedersen, E. Mishin, M. Starks, E. Gerken-Kendall, D. Sentman, S. Oyama, and B. Watkins. Temporal evolution of pump beam self-focusing at the High-Frequency Active Auroral Research Program. J. Geophys. Res., volume 112,  2007 .

M. J. Nicolls and C. J. Heinselman. Three-dimensional measurements of traveling ionospheric disturbances with the Poker Flat Incoherent Scatter Radar. Geophys. Res. Lett., volume 34, issue 2,  2007 .

M. J. Nicolls, C. J. Heinselman, E. A. Hope, S. Ranjan, M. C. Kelley, and J. D. Kelly. Imaging of Polar Mesosphere Summer Echoes with the 450 MHz Poker Flat Advanced Modular Incoherent Scatter Radar. Geophys. Res. Lett., volume 34, issue 2,  2007 .

M. N. Vlasov, M. C. Kelley, and D. L. Hysell. Eddy turbulence parameters inferred from radar observations at Jicamarca. Ann. Geophys., volume 25, issue 2, pages 475-481,  2007 .

S. Oyama, B. J. Watkins, F. T. Djuth, M. J. Kosch, P. A. Bernhardt, and C. J. Heinselman. Persistent enhancement of the HF pump-induced plasma line measured with a UHF diagnostic radar at HAARP. J. Geophys. Res., volume 111,  2006 .