Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa31b..07w&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA31B-07
Physics
0310 Airglow And Aurora, 0342 Middle Atmosphere: Energy Deposition, 0358 Thermosphere: Energy Deposition
Scientific paper
The SABER instrument on TIMED is continuously measuring limb radiance profiles of CO2 ν 3 (4.3-μ m) and ν 2 (15-μ m) and NO (5.3-μ m) with unprecedented sensitivity. SABER provides limb radiances up to ˜130km for the 15-μ m channel and ˜140-150km (approaching 200km during strong auroral events) for the 4.3-μ m channel and over 200km (to 300km during storm conditions) for the 5.3-μ m channel. From the SABER infrared channels and the GUVI FUV we have a measure of the auroral energy input at high latitudes into the lower thermosphere and its transport southward and its radiative loss through NO emission. We have previously reported that during the April 2002 geomagnetic storm the 4.3-μ m band nighttime emission was enhanced dramatically in the high latitude regions. The NO 5.3-μ m band emission also dramatically increased but it was not limited to the auroral zone. We extend this analysis to the October 2002 and May 2003 geomagnetic storms and to more isolated (short time) but strong auroral events. We will compare the morphology and time dependence of the enhancement in the 4.3-μ m and 5.3-μ m channels. Examining different situations in terms of length and strength of energy input allows us to better determine the lifetime of the enhanced NO emission (and hence a clue to the NO cooling) and the contribution of excited NO from auroral chemistry versus temperature and composition changes.
Christensen A.
Gordley Larry L.,
Lopez-Puertas Manuel
Martin-Torres F.
Mertens Chris J.
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