The plasma line revisited as an aeronomical diagnostic: Suprathermal electrons, solar EUV, electron-gas thermal balance
Article first published online: 7 DEC 2012
Copyright 1977 by the American Geophysical Union.
Geophysical Research Letters
Volume 4, Issue 12, pages 565–567, December 1977
How to Cite
(1977), The plasma line revisited as an aeronomical diagnostic: Suprathermal electrons, solar EUV, electron-gas thermal balance. Geophysical Research Letters, 4: 565–567. doi: 10.1029/GL004i012p00565
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 4 OCT 1977
- Manuscript Received: 25 JUL 1977
Spectra of plasma wave intensities (kTp) in the ionosphere over Arecibo are calculated and compared with those from observations of the plasma line intensity. This approach involving directly observed quantities avoids the uncertainties that have plagued past comparisons with photoelectron theory. In addition, careful comparisons in physically relevant segments of the spectra show that any significant increase in the magnitude of the solar EUV flux would lead to a contradiction of the observed plasma wave intensities. Further, the comparisons indicate that resolution of the thermal electron-gas heat balance problem must be sought through better heat transfer rates (e.g., heating and cooling rates, etc.), rather than in the solar EUV. This approach utilizes more fully the potential of the plasma line experiment as a diagnostic tool for aeronomical studies, (e.g., photoelectrons, auroral secondaries, ionosphere-modification experiments, etc.).