Computer Science – Sound
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9249m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 9249-9254.
Computer Science
Sound
3
Electron Energy, Energy Spectra, Ionospheric Sounding, Photoelectrons, Thermosphere, Error Analysis, Rocket Sounding
Scientific paper
The existence of marked structure in the 2- to 5-eV energy spectra of near-earth ionospheric photoelectrons has been predicted by theory and observed by experiment. This structure, arising from resonant vibrational excitation of N2, is seen as a valleylike dip in the spectra near 2.5 eV and is predicted to be most prominent at low altitudes (110 km), then to diminish with increasing altitude until it disappears in the 200- to 250-km region. All measurements to date indicate that the overall magnitude of this valley or dip is significantly less than that predicted by theory, but confirm a trend toward diminishing prominence with increasing altitude above about 150 km. Below 140-150 km, however, the valley is observed in the present data to also diminish with decreasing altitude, a reversal of the predicted trend. The present measurements include the only observations of this spectral structure below 140 km, and these indicate that its maximum prominence occurs in the 140- to 150-km altitude region, below which it is consistently observed to decline rapidly in magnitude. Recent refinement of theory may lead, in part, to an explanation of these discrepancies. The experimental results are summarized and the dificulties peculiar to space vehicle measurements of very low energy ambient electrons are examined.
Heroux L. J.
McMahon Jay W.
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