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Ionospheric Response to Geomagnetic Storms: CMIT Simulations & Observations

This study compares ionospheric responses to geomagnetic storms in 2004 and 2006, analyzing TEC maps and O/N2 ratios. Positive and negative effects are observed, with CMIT simulations showing good agreement with observations. Storm onset times influence ionospheric behavior.

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Ionospheric Response to Geomagnetic Storms: CMIT Simulations & Observations

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  1. 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

  2. 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

  3. Solar Wind Conditions April, 2004 November, 2004 December, 2006 1330 – 2200 UT 1000 – 2200 UT 1400 -2300 UT F10.7: 108 F10.7: 127 F10.7: 90

  4. April, 2004

  5. November, 2004

  6. December, 2006

  7. December, 2006 (Lei, et al. 2008)

  8. The ionosphere response to different storm onset times

  9. 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.

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