Compositional changes in thermosphere during a geomagnetic storm inferred using ground- based daytime OI 630.0nm optical airglow emissions

Details Compositional changes in thermosphere during a geomagnetic storm inferred using ground- based daytime OI 630.0nm optical airglow emissions Compositional changes in thermosphere during a geomagnetic storm inferred using ground- based daytime OI 630.0nm optical airglow emissions

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13a0264p&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA13A-0264

Physics

0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0350 Pressure, Density, And Temperature, 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition (3369)

Scientific paper

Redline (630.0nm) oxygen dayglow emissions were obtained in November 2001 from Carmen Alto, a low- latitude site in Chile, using the High Resolution Imaging Echelle spectrograph (HIRISE). On November 6, 2001 the DST reached values of about - 300 nT. HIRISE -measured daytime thermospheric (630.0nm) emissions showed large enhancement in morning hours of November 6. These emissions were similar in magnitudes to the typical daytime peak brightness. The measurements over a wide field-of-view indicate a steady propagation in emission brightness from high- to low- latitudes. Latitudinal TEC values along the western coast of South America on that day showed an inter-hemispheric asymmetry, which indicates a presence of strong neutral winds from high- to low-latitudes. Further, no change in electron densities is observed on this day. Hence, the enhancement in the daytime redline emissions are believed to be due to changes in neutral temperature and composition. Comparing HIRISE dayglow emissions with varying MSIS derived compositions as inputs to the GLOW model we obtain a 40% and 30% enhancements in O/N2 ratios and neutral temperatures for that time. These values compare reasonably well with physics based global TIMEGCM model outputs.

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