Atomic nitrogen densities near the polar cusp

Details Atomic nitrogen densities near the polar cusp Atomic nitrogen densities near the polar cusp

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.8407e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Sept. 1, 1985, p. 8407-8416.

Physics

5

Atmospheric Composition, Density Distribution, Neutral Atmospheres, Nitrogen Atoms, Polar Cusps, Solar Activity Effects, Extreme Ultraviolet Radiation, Solar Terrestrial Interactions

Scientific paper

The neutral atmospheric composition spectrometer on board the Dynamics Explorer 2 spacecraft sampled several major and minor thermospheric gases including atomic nitrogen. A selection of passes over the polar cusp that provide a quantitative measure of N densities in this region and provide evidence of localized density increases due to soft particle precipitation is presented. Increases in N densities are frequently observed but are smaller than accompanying increases in N2 densities. The observations support earlier studies suggesting that (1) N densities increase more rapidly than O densities during periods of high solar EUV flux and (2) N densities are larger in the summer hemisphere than in the winter hemisphere. A series of passes in February 1983, late in the lifetime of DE 2, indicated N densities at 200 km altitude were a factor of 2 larger near the southern cusp than near the northern cusp.

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