Composition Change in the Lower Thermosphere during the Great Magnetic Storm of November 20 2003 from TIMED Ground-Based and GUVI Observations

Details Composition Change in the Lower Thermosphere during the Great Magnetic Storm of November 20 2003 from TIMED Ground-Based and GUVI Observations Composition Change in the Lower Thermosphere during the Great Magnetic Storm of November 20 2003 from TIMED Ground-Based and GUVI Observations

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa42a..05h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA42A-05

Physics

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry

Scientific paper

While much attention has been given to the 2003 Halloween period geomagnetic storms, during the a following solar rotation a very large geomagnetic storm occurred on November 20th 2003. This storm was isolated rather than the muliple storm events which occurred during the previous month. The Ap on 11/20/03 was 150 with the Kp index reaching 9-. In contrast on the day before, 11/19/03, the Ap was 12, one of the quietest days of the month. Auroral activity continued after 11/20/03 although by 11/24/03 the Ap returned to a quiet level of 13. Here we will use dayglow and auroral measurements derived from the GUVI instrument on TIMED to study the evolution of the thermospheric [O]/[N2] ratio before (Nov 19), during (Nov 20), and after (Nov 21-24) this storm.While the GUVI data will provide the global response (at similar local times) we will also use ground-based photometer and Fabry-Perot OI(5577) temperature data from instruments located at Poker Flat and Fort Yukon, Alaska to study the evolution of the composition changes as a function of local time at fixed geographic locations. This will allow a comparison of the local and global responses to a large isolated auroral event.

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