CMIT Simulations of the Initial Phase of Geomagnetic Storms Wenbin Wang, Jiuhou Lei, Alan Burns, Stan Solomon, and Mike Wiltberger High Altitude Observatory National Center.
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CMIT Simulations of the Initial Phase of Geomagnetic Storms
Wenbin Wang, Jiuhou Lei, Alan Burns, Stan Solomon, and Mike Wiltberger High Altitude Observatory National Center for Atmospheric Research
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
Outline
A comparison of the response of the ionosphere to the initial phases of 3 storms (April 2004, Nov. 2004 and Dec. 2006): TEC (Total Electron Content) maps from observations and CMIT O/N2 ratio from GUVI and CMIT Mechanisms The effects of shock arrival time on the response of the ionosphere to storms
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
April, 2004 Solar Wind Conditions November, 2004 December, 2006 1330 – 2200 UT F10.7: 108 1000 – 2200 UT F10.7: 127 1400 -2300 UT F10.7: 90
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
April, 2004
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
November, 2004
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
December, 2006
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
December, 2006
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
(Lei, et al. 2008)
The ionosphere response to different storm onset times
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
Summary
Positive ionospheric response in daytime for all three storms at low and middle latitudes, had similar morphology, although solar radiation, season and IMF conditions were different. The CMIT simulations agrees well with the observations.
The CMIT results show that these positive responses were caused primarily by penetration electric fields Negative storm effects occurred in the morning and night-side, related to changes in O/N2 ratio. CMIT did a good job in simulating both the negative storm effects and O/N2 changes.
The responses of the ionosphere were different if the storm onset times were different, even with same solar wind conditions.
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008
CISM All hands Meeting • Boulder, CO • 15-17 Sept. 2008