Equatorial electrojet in the Indian region during the geomagnetic storm of 13–14 November 1998

被引：0
作者：
Chandra H. [1 ]
Rastogi R.G. [1 ]
Choudhary R.K. [2 ]
Sharma S. [1 ]
机构：
[1] Physical Research Laboratory, Ahmedabad
[2] Space Physics Laboratory, Vikram Sarabhai Space Centre, Thiruvananthapuram
来源：
Journal of Earth System Science | 2016年 / 125卷 / 3期
关键词：
Equatorial electrojet; Equatorial ionosphere; Geomagnetic storms;
D O I：
10.1007/s12040-016-0683-0
中图分类号：
学科分类号：
摘要：
The geomagnetic storm of November 1998 is a unique event where IMF-Bz remained southward with values exceeding –15 nT for more than a day. The SYM/H index decreased from about 07 hr on 13 November 1998 reaching a minimum of about –120 nT around midnight of 13–14 November 1998. Features of the equatorial electrojet in the Indian region are studied during the geomagnetic storm event of 13–14 November 1998, based on the geomagnetic data from the chain of observatories in India. Sudden northward turning of IMF-Bz for a very short duration around 08 hr on 13 November 1998 resulted in a small and very short duration counter electrojet. A strong (–50 nT) and a long duration counter electrojet, right from 08 to 13 hr on 14 November 1998 was observed resulting in the absence of equatorial Es at Thumba. Absence of the equatorial ionization anomaly was also observed as seen from the ionograms over Thumba and ionspheric data from Ahmedabad. The delayed effect on 14 November 1998 is due to the disturbance dynamo effect. © Indian Academy of Sciences.
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页码：669 / 675
页数：6
相关论文
共 15 条
  • [1] Abdu M.A., Batista I.S., Takahashi H., MacDougall J., Sobral J.H., Medeiros A.F., Trivedi N.B., Magnetospheric disturbance induced equatorial plasma bubble development and dynamics, J. Geophys. Res, 108, (2003)
  • [2] Abdu M.A., Maruyama T., Batista I.S., Saito S., Nakamura M., Ionospheric response to the October 2003 superstorm: Longitude/local time effects over the equatorial, low and middle latitudes, J. Geophys. Res, 112, (2007)
  • [3] Bagia M.S., Iyer K.N., Joshi H.P., Thampi S.V., Tsugawa T., Ravindran S., Sridharan R., Pathan B.M., Lowlatitude ionospheric-thermospheric response to storm time electrodynamical coupling between high and low latitudes, J. Geophys. Res, 116, (2011)
  • [4] Basu S., Su B., Groves K.M., Yeh H.C., Su S.-Y., Rich F.J., Sultan P.J., Keskinen M.J., Response of the equatorial ionosphere in the South Atlantic region to the great magnetic storm of July 15, 2000, Geophys. Res. Lett, 28, pp. 3577-3580, (2001)
  • [5] Su B., Basu S., Valladares C.E., Yeh H.C., Su S.Y., Mackenzie E., Sultan P.J., Aarons J., Rich F.J., Doherty J.P., Groves R.M., Bullet T.W., Ionospheric effects of major magnetic storms during the International Space Weather Period of September and October 1999: GPS observations VHF/UHF installations and in situ density structures at middle and equatorial latitudes, J. Geophys. Res, 106, (2001)
  • [6] Blanc M., Richmond A.D., The ionospheric disturbance dynamo, J. Geophys. Res, 85, pp. 1669-1688, (1980)
  • [7] Kelley M.C., Fejer B.G., Gonzales C.A., An explanation for anomalous ionospheric electric field associated with a northward turning of the interplanetary magnetic field, Geophys. Res. Lett, 6, pp. 301-304, (1979)
  • [8] Maruyama T., Extreme enhancement in total electron content after sunset on 8 November 2004 and its connection with storm enhanced density, Geophys. Res. Lett, 33, (2006)
  • [9] Rastogi R.G., Chandra H., Interplanetary magnetic field and the equatorial ionosphere, J. Atmos. Terr. Phys, 36, 2, pp. 377-379, (1974)
  • [10] Rastogi R.G., Patel V.L., Effect of interplanetary magnetic field on the ionosphere over the magnetic equator, Proc. Indian Acad. Sci. A, 82, pp. 121-141, (1975)
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