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 . 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 . 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 . 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. 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 . 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 . 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 . 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 . 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 . 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 .