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Detailed Reference Information |
Djuth, F.T., Bernhardt, P.A., Tepley, C.A., Gardner, J.A., Kelley, M.C., Broadfoot, A.L., Kagan, L.M., Sulzer, M.P., Elder, J.H., Selcher, C., Isham, B., Brown, C. and Carlson, H.C. (1999). Large airglow enhancements produced via wave-plasma interactions in sporadic E. Geophysical Research Letters 26: doi: 10.1029/1999GL900296. issn: 0094-8276. |
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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. ¿ 1999 American Geophysical Union |
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BACKGROUND DATA FILES |
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Abstract |
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Keywords
Ionosphere, Active experiments, Ionosphere, Midlatitude ionosphere, Ionosphere, Wave/particle interactions |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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