Geomagnetic Activity Indices

  • Walter Dieminger
  • Gerd K. Hartmann
  • Reinhart Leitinger

Abstract

The predominant part of the geomagnetic field, as observed at the Earth’s surface, originates from sources in the Earth’s core and, to a lesser degree, in the Earth’s crust. Spatial distribution and secular variation of this internal part were described, e.g., by Schmucker (1985). Superimposed, there is a small external part due to large-scale current systems in the ionosphere and magnetosphere finally resulting from the motion of charged particles in the Earth’s magnetic field. Short-term time variations of the external part are governed by solar wave (W) and particle (P) radiation and thus may serve to yield information on solar-terrestrial relationships that otherwise cannot so easily and continuously be achieved.

Keywords

Flare Assimilation Resi Boulder 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  • Walter Dieminger
    • 1
  • Gerd K. Hartmann
    • 1
  • Reinhart Leitinger
    • 2
  1. 1.Max-Planck-Institut für AeronomieKatlenburg-LindauGermany
  2. 2.Institut für Meteorologie und GeophysikUniversität GrazGrazAustria

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