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Relationships Between the Solar Wind and the Polar Cap Magnetic Activity

  • Annick Berthelier
Part of the NATO Advanced Study Institutes Series book series (ASIC, volume 64)

Abstract

The influence of solar wind conditions on magnetic activity is described in order to delineate the differences in the response of the magnetic activity to the arrival on the magnetopause of different typical solar wind variations. By determining a new index of local magnetic activity free from seasonal and diurnal effects we put in evidence the dependance of the various effects upon the invariant latitude. Most important results are: (1) the main increase of the magnetic activity does not occur at the same invariant latitude for different interplanetary variations, e.g. peaks of Bz tend to increase magnetic activity mainly in the auroral zones while peaks of B correspond to a uniform increase in magnetic activity over the polar cap and auroral zone; (2) there is a two steps response of magnetic activity to the high speed plasma streams; (3) an increase of magnetic activity is observed for large and northward Bz, which probably indicates that the solar wind — magneto-sphere coupling is efficient under these circumstances. The specific influences of the IMF polarity are also briefly reviewed.

Keywords

Solar Wind Interplanetary Magnetic Field Magnetic Activity Auroral Zone Solar Wind Parameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1980

Authors and Affiliations

  • Annick Berthelier
    • 1
  1. 1.LGE — CNRSSt-Maur-des-FossésFrance

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