Observation of winter enhancement of twilight lambda 3914 by Isis 2

Details Observation of winter enhancement of twilight lambda 3914 by Isis 2 Observation of winter enhancement of twilight lambda 3914 by Isis 2

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4351w&link_type=abstract

Journal of Geophysical Research, vol. 80, Nov. 1, 1975, p. 4351-4358. Research supported by the National Research Council of Ca

Physics

Annual Variations, Auroral Zones, Nitrogen Ions, Satellite Observation, Twilight Glow, Upper Ionosphere, Conjugate Points, Isis Satellites, Limb Darkening, Molecular Ions, Northern Hemisphere, Optical Scanners, Photometers, Polar Orbits, Southern Hemisphere, Winter

Scientific paper

Topside N2(+) content and scale height from Isis 2 auroral scanning photometer data at 3914 A for three evening twilights are found to be about 3 times as great in winter as in summer over the Pacific sector. The observed intensity distributions are compared with a photochemical model that underestimates the summer intensities by about a factor of 2, and that offers no possibility of explaining the winter enhancement. Estimates of enhancement by conjugate photoelectrons, neutral winds, and Penning ionization by metastable helium indicate that none of these are sufficient to explain the seasonal variation.

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