Geomagnetism and Aeronomy

, Volume 58, Issue 1, pp 9–15 | Cite as

Effects in the Geomagnetic Field and Absorption of Cosmic Radio Emission Caused by the Negative Pressure Discontinuity of the Solar Wind: Analysis of a Particular Event

  • O. I. Shumilov
  • E. A. Kasatkina
  • N. G. Kleimenova


An abrupt decrease in the solar wind pressure and its effect on the magnetosphere and ionosphere during the event occurring on April 4, 1971, are studied. This event differs fundamentally from a typical sudden commencement (SC) of a geomagnetic storm or from a positive sudden impulse (SI+) and is determined as a negative sudden impulse (SI). The geomagnetic variations at different latitudes and the cosmic radio emission in the auroral zone are analyzed. From the data of low-latitude geomagnetic observatories, several subsequent negative impulses observed with a periodicity of ~45 min were found. At the same time, a sudden decrease in the absorption of cosmic radio emission in the auroral zone was revealed. Possible physical explanations of the observed changes are discussed.


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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • O. I. Shumilov
    • 1
  • E. A. Kasatkina
    • 1
  • N. G. Kleimenova
    • 2
    • 3
  1. 1.Polar Geophysical Institute of the Russian Academy of SciencesApatity, Murmansk oblastRussia
  2. 2.Schmidt Institute of Physics of the Earth of the Russian Academy of SciencesMoscowRussia
  3. 3.Institute of Cosmic Research of the Russian Academy of SciencesMoscowRussia

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