Excitation of red and green lines during in the presence of aurora
Abstract
Natural auroral glow is an evident obstacle for observations of artificially excited airglow. On the other hand, diffuse precipitation of moderate fluxes of soft electrons can provide an opportunity of studying new aspects of HF wave-generated turbulence with slightly perturbed ionosphere plasma. There are, at least, two such aspects that can be explored specifically at sub-auroral latitudes. The first is interaction of the background electron population with plasma waves excited by HF pump . As a result, acceleration of secondary electrons in the energy range beginning from about 10 eV will yield a favorable excitation of the green line with respect to the red one. The second aspect stems from the possibility of generation of ULF/VLF waves and subsequent electron precipitation from the plasma sheet. The advantages/disadvantages of vertical and magnetic zenith injections regarding the above aspects are evaluated based on the existing theory of interaction of HF pump with the ionosphere plasma. Recent results of the observations of artificial airglow from HAARP in the presence of aurora are discussed.
- Publication:
-
34th COSPAR Scientific Assembly
- Pub Date:
- 2002
- Bibcode:
- 2002cosp...34E.541M