Nighttime plasma lines are measured at Arecibo (Vierinen et al. [2017]).

Vierinen, J., B. Gustavsson,
D. L. Hysell, M. P. Sulzer,
P. Perillat, and E. Kudeki


Some ISR facilities observe day time plasma lines (produced by suprathermal electrons energized by the sun). Vierinen et al. [2017] implemented some techniques, using the high sensitivity of the Arecibo ISR system, to observe the night time plasma line. The nighttime plasma line is produced by suprathermal electrons energized by sources different than the sun. No other radar has the sensitivity to implement this technique.

Title: Nighttime plasma lines are measured at Arecibo (Vierinen et al. [2017]).
Citation: Vierinen, J., B. Gustavsson,
D. L. Hysell, M. P. Sulzer,
P. Perillat, and E. Kudeki (2017), Radar observations of thermal plasma oscillations in the ionosphere, Geophys. Res. Lett., 44, 5301–5307, doi:10.1002/ 2017GL073141. 

Web Link: http://onlinelibrary.wiley.com/doi/10.1002/2017GL073141/full
Keywords: isr, plasma lines, vierinen, arecibo, suprathermal electrons, gustavsson, hysell, sulzer, perillat, kudeki