Direct observations of nitric oxide produced by energetic electron precipitation into the Antarctic middle atmosphere

Details Direct observations of nitric oxide produced by energetic electron precipitation into the Antarctic middle atmosphere Direct observations of nitric oxide produced by energetic electron precipitation into the Antarctic middle atmosphere

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3820104n&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 20, CiteID L20104

Physics

1

Atmospheric Composition And Structure: Ion Chemistry Of The Atmosphere (2419, 2427), Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Energy Deposition (3334), Ionosphere: Particle Precipitation, Atmospheric Processes: Remote Sensing (4337)

Scientific paper

We report the first ground-based passive microwave observations made from Troll station, Antarctica, which show enhanced mesospheric nitric oxide (NO) volume mixing ratio reaching levels of 1.2 ppmv, or 2-3 orders of magnitude above background, at 70-80 km during small, relatively isolated geomagnetic storms in 2008. The mesospheric NO peaked 2 days after enhanced NO at higher altitudes (110-150 km) measured by the SABER satellite, and 2 days after peaks in the >30 keV and >300 keV electron flux measured by POES, although the 300 keV electron flux remained high. High time resolution data shows that mesospheric NO was enhanced at night and decayed during the day and built up to high levels over a period of 3-4 days. The altitude profile of mesospheric NO suggests direct production by ˜300 keV electron precipitation. Simulations using the Sodankylä Ion and Neutral Chemistry model show that the delay between thermospheric and mesospheric NO enhancements was primarily a result of the weaker production rate at lower altitudes by ˜300 keV electrons competing against strong day-time losses.

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