Causes of Sub-Auroral Variability of Nitric Oxide in the Thermosphere

Details Causes of Sub-Auroral Variability of Nitric Oxide in the Thermosphere Causes of Sub-Auroral Variability of Nitric Oxide in the Thermosphere

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa34a..02t&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA34A-02

Physics

0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 3369 Thermospheric Dynamics (0358), 7519 Flares

Scientific paper

Nitric Oxide (NO) is an important variable radiative cooling agent in the thermosphere and it becomes even more important during geomagnetically disturbed periods. Understanding the global distribution of NO and its temporal and spatial evolution under extreme conditions is critical for understanding the energy balance in the thermosphere. The NO concentration is mainly controlled by its production through mechanisms related to solar EUV irradiance, solar soft x-rays, and auroral particle precipitation, and by its destruction through its reactions with oxygen. Depending on altitude, transport may also play a role in the redistribution of NO spatially, especially for the observed enhancement at low-latitudes after major geomagnetic storms. In this paper we will assess the significance of these potential causes of NO variability by interpreting satellite measurements of thermospheric densities, NO 5.3 micron radiance, and auroral particle precipitation characteristics, and by using a 3D general circulation model of the middle and upper atmosphere, the TIME-GCM.

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