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  The growth of ring current/SYM-H under northward IMF Bz conditions present during the 21-22 January 2005 geomagnetic storm

Rout, D., Patra, S., Kumar, S., Chakrabarty, D., Reeves, G., Stolle, C., Pandey, K., Chakraborty, S., Spencer, E. (2023): The growth of ring current/SYM-H under northward IMF Bz conditions present during the 21-22 January 2005 geomagnetic storm, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1219

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 Creators:
Rout, D1, 2, Author              
Patra, Swadesh1, Author
Kumar, Sandeep1, Author
Chakrabarty, Dibyendu1, Author
Reeves, Geoff1, Author
Stolle, Claudia1, Author
Pandey, Kuldeep1, Author
Chakraborty, Shibaji1, Author
Spencer, Edmund1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              
22.3 Geomagnetism, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146030              

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 Abstract: The Magnetosphere-Ionosphere (MI) system is primarily driven by solar wind dynamics. The energy transfer from the solar wind to the Earth’s magnetosphere is most efficient under southward IMF Bz conditions. Generally, the southward IMF Bz drives the ring current which is measured by the Dst/SYM-H index. The geomagnetic storm during 21-22 January 2005 is considered to be anomalous as growth of the ring current is found to be under northward IMF Bz conditions. The SYM-H continues to grow for more than six hours, reaching a minimum value of -101 nT. The WINDMI model is utilised to estimate the growth of the ring current by using several coupling functions. However, none of these coupling functions could predict this unusual growth of the ring current under the northward IMF Bz conditions. A highly dense plasma sheet was observed during the anomalous period and incorporating this in the WINDMI model led to the successful reproduction of the observed disturbance. This investigation clearly shows the important role of the state of the magnetosphere in energizing the ring current. Therefore, it is suggested that the space weather models need to include both the conditions of solar wind and magnetosphere in order to get a better prediction of the strength of the ring current.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-1219
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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