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

HR: 11:20h
AN: SA42A-05 [Abstracts]
TI: Composition Change in the Lower Thermosphere during the Great Magnetic Storm of November 20 2003 from TIMED Ground-Based and GUVI Observations
AU: * Hecht, J H
EM: james.hecht@aero.org
AF: Space Science Applications Laboratory,The Aerospace Corporation, Mail Stop M2-259, PO Box 92957, Los Angeles, CA 90009 United States
AU: Strickland, D J
EM: dstrick@cpi.com
AF: Computational Physics Inc., 8001 Braddock Rd Ste 210, Springfield, VA 22151 United States
AU: Conde, M G
EM: m.conde@latrobe.edu.au
AF: Physics Department, La Trobe University, Victoria, 3086 Australia
AU: Morrison, M D
EM: Danny.Morrison@jhuapl.edu
AF: Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723 United States
AB: 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]/[N$_2$] 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.
DE: 0310 Airglow and aurora
DE: 0355 Thermosphere--composition and chemistry
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting