On the Relationship of Joule Heating and NO Radiative Cooling in the Thermosphere

Details On the Relationship of Joule Heating and NO Radiative Cooling in the Thermosphere On the Relationship of Joule Heating and NO Radiative Cooling in the Thermosphere

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsa24a..07l&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SA24A-07

Physics

0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369), 2427 Ionosphere/Atmosphere Interactions (0335)

Scientific paper

Nitric Oxide (NO) is an important trace constituent in the thermosphere, and it plays an important role in determining the composition and structure of the thermosphere above 100 km. Emissions from the NO molecule are one of the main radiative cooling mechanisms in the thermosphere. Observations from the TIMED SABER instrument have shown that NO emissions at 5.3 mm increase dramatically during geomagnetic storms. This paper examines the relationship between the Joule heating rate and the NO radiative cooling rate, with an aim to obtain an quantitative assessment of global energy balance in the thermosphere. More specifically, we compare in detail the magnetospheric energy input in terms of Joule heating and the thermospheric energy output through radiative cooling for a number of geomagnetic storms. The cross-correlation analysis is carried out to assess the effectiveness of NO "thermostat" effect in regulating the magnetospheric energy input into the thermosphere. Finally, we explore the possibility of using the polar cap index (PCI) as a proxy of thermospheric energetics.

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