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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CISM All-hands Meeting Boulder, CO Sept 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 Sept Outline A comparison of the response of the ionosphere to the initial phases of 3 storms (April 2004, Nov 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 Sept Solar Wind Conditions November, 2004December, 2006April, – 2200 UT 1000 – 2200 UT UT F10.7: 108 F10.7: 127 F10.7: 90

CISM All-hands Meeting Boulder, CO Sept. 2008

April, 2004

CISM All-hands Meeting Boulder, CO Sept. 2008

November, 2004

CISM All-hands Meeting Boulder, CO Sept. 2008

December, 2006

CISM All-hands Meeting Boulder, CO Sept (Lei, et al. 2008) December, 2006

CISM All-hands Meeting Boulder, CO Sept The ionosphere response to different storm onset times

CISM All-hands Meeting Boulder, CO 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 Sept. 2008