The response of the thermospheric nitric oxide to an auroral storm. I - Low and middle latitudes

Details The response of the thermospheric nitric oxide to an auroral storm. I - Low and middle latitudes The response of the thermospheric nitric oxide to an auroral storm. I - Low and middle latitudes

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9416885s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 16885-16898.

Physics

46

Atmospheric General Circulation Models, Atmospheric Heating, Auroras, Magnetic Storms, Nitric Oxide, Thermosphere, Tropical Regions, Ohmic Dissipation, Photochemical Reactions, Resistance Heating, Solar Mesosphere Explorer, Temperature Distribution

Scientific paper

The response of low- and mid-latitude NO to the September 19, 1984 magnetic storm is studied. In particular, the effect of variations in the temperature and composition of the lower thermosphere on NO is investigated. Much of the observed NO response is adequately explained by including these variations in a photochemical model. In particular, Joule heating at auroral latitudes can cause temperature enhancements at nonauroral latitudes, which in turn can lead directly to an increase in the NO. The NO is most directly sensitive to heating at altitude above 120 km. Below 120 km, NO increased through downward diffusion from above. Sensitivity studies were performed to investigate the effect that uncertainties in the NO chemical scheme and in the state of the neutral atmosphere can have on the comparison of the model to the data. It is shown that the best fit to the midlatitude American orbit data is for O/O2 ratio twice that in the original TGCM simulation and for an N(2D) quenching value of 5 x 10 to the -13th.

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