A. Hu, B. Carter, J. Currie, R. Norman, S. Wu, and K. Zhang. A Deep Neural Network Model of Global Topside Electron Temperature Using Incoherent Scatter Radars and Its Application to GNSS Radio Occultation. Journal of Geophysical Research: Space Physics, volume 125, issue 2,  2020 .

A. Hu, B. Carter, J. Currie, R. Norman, S. Wu, X. Wang, and K. Zhang. Modeling of Topside Ionospheric Vertical Scale Height Based on Ionospheric Radio Occultation Measurements. Journal of Geophysical Research: Space Physics, volume 124, issue 6,  2019 .