X. Tian, Y. Yu, F. Gong, L. Ma, J. Cao, S. C. Solomon, P. R. Shreedevi, K. Shiokawa, Y. Otsuka, S.-i. Oyama, and Y. Miyoshi. Ionospheric Modulation by EMIC Wave-Driven Proton Precipitation: Observations and Simulations. Journal of Geophysical Research: Space Physics, volume 128, issue 1, 2023 . 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 .