M. R. Negale, M. J. Taylor, M. J. Nicolls, S. L. Vadas, K. Nielsen, and C. J. Heinselman. Seasonal propagation characteristics of MSTIDs observed at high latitudes over Central Alaska using the Poker Flat Incoherent Scatter Radar. Journal of Geophysical Research: Space Physics, American Geophysical Union, volume 123,  2018 .

M. M. J. Ruohoniemi, J. Baker, C. Clauer, M. Nicolls, and M. Hairston. RISR-N observations of the IMF By influence on reverse convection during extreme northward IMF. J. Geophys. Res. Space Physics, issue 122,  2017 .

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 .

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 .

Y. Shen, D. J. Knudsen, J. K. Burchill, A. Howarth, A. Yau, R. J. Redmon, D. M. Miles, R. H. Varney, and M. J. Nicolls. Strong ambipolar-driven ion upflow within the cleft ion fountain during low geomagnetic activity. J. Geophys. Res. Space Physics, issue 121,  2016 .

R. G. Gillies, A. van Eyken, E. Spanswick, M. Nicolls, J. Kelly, M. Greffen, D. Knudsen, M. Connors, M. Schutzer, T. Valentic, M. Malone, J. Buonocore, J.-P. St.-Maurice, and E. Donovan. First observations from the RISR-C incoherent scatter radar. Radio Science, American Geophysical Union, volume 51,  2016 .

C. R. Clauer, Z. Xu, M. Maimaiti, J. M. Ruohoniemi, W. Scales, M. D. Hartinger, M. J. Nicolls, S. Kaeppler, F. D. Wilder, and R. E. Lopez. Investigation of a rare event where the polar ionospheric reverse convection potential does not saturate during a period of extreme northward IMF solar wind driving. J. Geophys. Res. Space Physics, volume 121,  2016 .

S.-R. Zhang, J. M. Holt, P. J. Erickson, L. P. Goncharenko, M. J. Nicolls, M. McCready, and J. Kelly. Ionospheric ion temperature climate and upper atmospheric long-term cooling. J. Geophys. Res. Space Physics, American Geophysical Union, issue 121,  2016 .

C. Yue, W. Li, Y. Nishimura, Q. Zong, Q. Ma, J. Bortnik, R. M. Thorne, G. D. Reeves, H. E. Spence, C. A. Kletzing, J. R. Wygant, and M. J. Nicolls. Rapid enhancement of low-energy (<100  eV) ion flux in response to interplanetary shocks based on two Van Allen Probes case studies: Implications for source regions and heating mechanisms. J. Geophys. Res. Space Physics, issue 121,  2016 .

Y. Zou, Y. Nishimura, J. K. Burchill, D. J. Knudsen, L. R. Lyons, K. Shiokawa, S. Buchert, S. Chen, M. J. Nicolls, M. J. Ruohoniemi, K. A. McWilliams, and N. Nishitani. Localized field-aligned currents in the polar cap associated with airglow patches. J. Geophys. Res. Space Physics, American Geophysical Union, issue 121,  2016 .

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

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 .

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 .

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 .

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 .

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 .

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 .

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 .

L. R. Lyons, Y. Nishimura, B. Gallardo-Lacourt, Y. Zou, E. F. Donovan, S. Mende, V. Angelopoulos, J. M. Ruohoniemi, K. A. McWilliams, D. L. Hampton, and M. J. Nicolls. Dynamics Related to Plasmasheet Flow Bursts as Revealed from the Aurora. Auroral Dynamics and Space Weather (eds. Y. Zhang and L. J. Paxton), John Wiley & Sons,  2015 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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 .

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. 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 .

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 .

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 .

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 .

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 .

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 .

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 .

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. 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 .

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 .

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 .

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 .

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 .

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 .

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. 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 .

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 .

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. 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 .

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 .

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 .

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. 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 .

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, 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 .

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 .

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. 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 .

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 .

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. 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. 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 .

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 .

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 .

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 .

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 .

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 .

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 .

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, 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 .

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 .

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 .