Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa51a1111p&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA51A-1111
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
Ground-based optical emissions from Carmen Alto, a low-latitude site, were obtained using HIRISE during November 2001. During November 6, 2001 geomagnetic storm the DST reached values of about 300 nT. HIRISE -measured daytime thermospheric (630.0nm) emissions showed large enhancement in morning hours of November 6, which were similar in magnitudes to the typical daytime peak brightness. These measurements over a wide field-of-view indicated a steady propagation of 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 the presence of strong neutral winds. 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. Comparison of the HIRISE measured emissions with GLOW model 630.0nm emissions for varying inputs of neutrals reveal a factor of 3 - 4 increase in oxygen to molecular nitrogen ratio on that day along with a few percent variations in the neutral temperatures. These results will be compared with physics based global models such as TIMEGCM on quiet and disturbed periods.
Chakrabarti Sangeeta
Pallamraju Duggirala
Solomon Stanley C.
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