Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Thermospheric Wind Observation and Simulation during the Nov 4, 2021 Geomagnetic Storm Event

  • Wu, Qian (High Altitude Observatory, National Center for Atmospheric Research) ;
  • Lin, Dong (High Altitude Observatory, National Center for Atmospheric Research) ;
  • Wang, Wenbin (High Altitude Observatory, National Center for Atmospheric Research) ;
  • Ward, William (Department of Physics, University of New Brunswick)
  • Received : 2022.06.10
  • Accepted : 2022.07.14
  • Published : 2022.09.15
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Abstract

Thermospheric wind observations from high to mid latitudes are compared with the newly developed Multiscale Atmosphere Geospace Environment (MAGE) model for the Nov 3-4 geomagnetic storm. The observation and simulation comparison shows a very good agreement and is better at high latitudes in general. We were able to identify a thermospheric poleward wind reduction possibly linked to a northward turning of the Interplanetary Magnetic Field (IMF) at ~22 UT on Nov 3 and an enhancement of the poleward wind to a southward turning near 10 UT on Nov 4 at high latitudes. An IMF southward turning may have led to an enhancement of equatorward winds at Boulder, Colorado near midnight. Simultaneous occurrence of aurora may be associated with an IMF By turning negative. The MAGE model wind simulations are consistent with observations in these cases. The results show the model can be a very useful tool to further study the magnetosphere and ionosphere coupling on short time scales.

Keywords

Acknowledgement

This work is supported by NSF grant AGS-2120511, NASA grants 80NSSC20K0199, 80NAAC21K0014, 80NSSC22K0170. NCAR is supported by the National Science Foundation. The Boulder, Eureka, and Resolute data can be found at NCAR HAO data portal https://www.hao.ucar.edu. We would like to thank a reviewer for thoughtful suggestions and comments.

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