CISM All-hands Meeting Boulder, CO 15-17 Sept. 2008 CMIT Simulations of the Initial Phase of Geomagnetic Storms Wenbin Wang, Jiuhou Lei, Alan Burns, Stan.

CISM All-hands Meeting • Boulder, CO • 15-17 Sept. 2008

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


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


Solar Wind Conditions

November, 2004 December, 2006April, 2004

1330 – 2200 UT 1000 – 2200 UT 1400 -2300 UTF10.7: 108 F10.7: 127 F10.7: 90



April, 2004



November, 2004



December, 2006


(Lei, et al. 2008)

December, 2006


The ionosphere response to different storm onset times



SummaryPositive 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 CMIT Simulations of the Initial Phase of Geomagnetic Storms Wenbin Wang, Jiuhou Lei, Alan Burns, Stan.

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