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

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3815802h&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 15, CiteID L15802

Physics

Global Change: Remote Sensing (1855, 4337), Global Change: Solar Variability (7537), Atmospheric Processes: Radiative Processes

Scientific paper

The effects of solar cycle 24 are now clearly evident in the infrared radiative cooling of the thermosphere as observed by the SABER instrument on the NASA TIMED satellite. 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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