Infrared Radiation in the Thermosphere at the Onset of Solar Cycle 24

Details Infrared Radiation in the Thermosphere at the Onset of Solar Cycle 24 Infrared Radiation in the Thermosphere at the Onset of Solar Cycle 24

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1823h&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1823

Computer Science

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[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition

Scientific paper

The Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on the NASA Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics (TIMED) satellite measures the vertical distribution of infrared radiation emitted by various atmospheric gases, including nitric oxide and carbon dioxide, providing important information about the radiation budget in the upper atmosphere. From these measurements, the infrared power and energy radiated by nitric oxide (NO) and carbon dioxide (CO2) have been computed. The effects of Solar Cycle 24 are now clearly evident in the infrared radiative cooling of the thermosphere as observed by SABER. After reaching a minimum in 2009, infrared radiative cooling of the thermosphere by nitric oxide (NO) and carbon dioxide (CO2) has been steadily increasing. The global infrared power radiated by NO in mid-April 2011 is about four times the minimum value while the CO2 power is about 15% larger than at the minimum. In addition, the short-term variability of the NO emission has increased and is strongly correlated with increased geomagnetic variability as inferred from the Ap index. The increasing levels of infrared emission are indicative of a warming thermosphere and possibly increasing levels of atomic oxygen and nitric oxide. However the infrared power presently radiated by NO is only about 40% of the maximum value observed by the SABER instrument in late 2002 while the CO2 power is now about 80% of the maximum observed value. The SABER infrared time series, now approaching 10 years in length, is a unique climate data record for testing the radiative and chemical physics of upper atmosphere general circulation models.

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