Physics
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1557d&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 11, p. 1557-1560
Physics
25
Ionosphere: Active Experiments, Ionosphere: Midlatitude Ionosphere, Ionosphere: Wave/Particle Interactions
Scientific paper
In the past there has been great interest in monitoring enhanced 557.7 nm O(1S) emissions from the thermosphere in connection with high-power, high-frequency (HF) radio wave modification of the F region ionosphere. These emissions are considered to be evidence that the HF-modified electron distribution function is non-Maxwellian because a significant flux of ~5-6 eV electrons is required to produce the airglow. The suprathermal tail is believed to develop as a result of nonlinear plasma processes. Past F region observations of 557.7 nm airglow at Arecibo Observatory, Puerto Rico have yielded only a few Rayleighs of enhanced emissions. Recently, airglow enhancements were monitored in sporadic E above Arecibo. Surprisingly, these experiments yielded ~55 Rayleighs of enhanced 557.7 nm airglow and the first observations of emissions from the N2 first positive molecular bands. The observations imply that a large flux of energetic (5-10 eV) electrons is generated as part of the wave-plasma interaction in sporadic E.
Bernhardt Paul A.
Broadfoot Lyle A.
Brown Campbell
Carlson Herbert C.
Djuth Frank T.
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