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Variations of the magnetopause position versus the level of geomagnetic activity (according to data of the INTERBALL-1 Satellite for 1995–1997)

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Abstract

The variations in the deviation of the observed position of the magnetosphere boundary from its mean position predicted by the Shue at al., 1997 (Sh97) model [7] are studied as a function of the substorm activity level (the AE-index value) and magnetic storm intensity (the value of the corrected D * st index). The results obtained make it possible to state that the amplitude of motion of the magnetospheric boundary on the dayside and in the low-latitude tail is small. It is likely that the position of the boundary is either independent of the AE and D * st indices or this dependence is weak. At the same time, the boundary of the high-latitude tail shifts inward on the average by 1.5R E with an increase of the AE-index in the case of absence of magnetic storms (contraction of the magnetospheric tail). On the contrary, in the presence of magnetic storms, this boundary shifts outward by up to 3R E with an increase of the AE-index (inflation of the magnetospheric tail). It is also shown that the boundary of the high-latitude tail moves outward with an increase of the D * st index, both at low substorm activity and in periods of high substorm activity. The amplitude of the outward motion of the high-latitude tail of the magnetosphere is by a factor of two higher for moderate magnetic storms with strong substorms than for moderate magnetic storms with weak substorms.

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Authors and Affiliations

  1. Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117997, Russia

    N. S. Nikolaeva, Yu. I. Yermolaev & N. L. Borodkova

  2. Baikalsky State University of Economy and Law, Irkutsk, Russia

    V. A. Parkhomov

Authors
  1. N. S. Nikolaeva
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  2. Yu. I. Yermolaev
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  3. N. L. Borodkova
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  4. V. A. Parkhomov
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Original Russian Text © N.S. Nikolaeva, Yu.I. Yermolaev, N.L. Borodkova, V.A. Parkhomov, 2006, published in Kosmicheskie Issledovaniya, 2006, Vol. 44, No. 5, pp. 403–410.

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Nikolaeva, N.S., Yermolaev, Y.I., Borodkova, N.L. et al. Variations of the magnetopause position versus the level of geomagnetic activity (according to data of the INTERBALL-1 Satellite for 1995–1997). Cosmic Res 44, 385–392 (2006). https://doi.org/10.1134/S0010952506050017

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  • DOI: https://doi.org/10.1134/S0010952506050017

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