Nitric Oxide Emissions in the Thermosphere during the January 2005 Solar Storm

Details Nitric Oxide Emissions in the Thermosphere during the January 2005 Solar Storm Nitric Oxide Emissions in the Thermosphere during the January 2005 Solar Storm

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa51a1211p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA51A-1211

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0317] Atmospheric Composition And Structure / Chemical Kinetic And Photochemical Properties, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition

Scientific paper

An investigation of 5.3 micron nitric oxide (NO) emissions in the thermosphere measured by the MIPAS spectrometer and the SABER radiometer satellite instruments during the solar storm on January 21, 2005 was conducted. The MIPAS and SABER data were inverted to retrieve NO volume emission rates as a function of altitude. The high spectral resolution of the MIPAS instrument allowed a detailed study of the rotational and spin-orbit distributions of NO. Spectral fitting of the MIPAS data was used to determine the NO(v = 1) rotational and spin-orbit temperatures over the course of the storm. The two primary sources of NO(v = 1) in the thermosphere are the collisional excitation of NO(v = 0) by O atoms and the chemical reactions of N atoms with O2. Auroral activity leads to Joule heating and increased production of N atoms, resulting in enhanced formation of NO(v = 1) by collisional excitation and chemical reactions. Strong NO 5.3 micron signal levels and increased rotational and spin-orbit temperatures were detected during the storm. These results are being compared with non-LTE model calculations to investigate the relative contributions of the different NO(v = 1) production mechanisms.

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