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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 2
Ann. Geophys., 16, 134–139, 1998
https://doi.org/10.1007/s00585-998-0134-6
© European Geosciences Union 1998
Ann. Geophys., 16, 134–139, 1998
https://doi.org/10.1007/s00585-998-0134-6
© European Geosciences Union 1998

  28 Feb 1998

28 Feb 1998

Long-period geomagnetic pulsations caused by the solar wind negative pressure impulse on 22 March 1979 (CDAW-6)

V. A. Parkhomov1, V. V. Mishin2, and L. V. Borovik1 V. A. Parkhomov et al.
  • 1Irkutsk State Economy Academy, Lenin street 11, Irkutsk 3, 664003, Russia
  • 2Institute of Solar-Terrestrial Physics, Irkutsk 33, PO Box 4026, 664033, Russia

Abstract. An analysis is made of the long-period geomagnetic pulsations as recorded at seven Norilsk meridian stations (λ=162°, latitudinal range: 61°–71°N) following abrupt magnetospheric expansion during the storm of 22 March 1979 caused by a rapid decrease in solar wind density. As with the time interval following an abrupt contraction at the time of sudden storm commencement, there exist two types of pulsations in the pulsation spectra: latitude-independent 
(T>400 s) and latitude-dependent (T<200 s) pulsations. The first pulsation type is interpreted in terms of forced pulsations associated with magnetopause oscillations. The oscillation period is determined by plasma density in the boundary layer and by the radius of the magnetosphere (T ~ ρ1/2R4). The latitudinal dependence of the period, amplitude and polarization of the second-type pulsations is in agreement with the resonance mechanism of their origin.

Keywords. Geomagnetic pulsations · Solar wind · Magnetopause oscillations

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