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146-day signal in the geomagnetic field—a probable association with the periodicity of the solar flare index

  • D. R. K. Rao
  • B. D. Kadam
Article
  • 16 Downloads

Abstract

Results on the spectral analysis using geomagnetic field at three low latitude stations and the planetary magnetic activity index have shown peaks in the power densities in a broad band centred around 146-day period. This periodic behaviour appears to be close to that shown by the solar flare activity index for the same interval. It is suggested that the geoeffectiveness of the flare activity signal in different phases of the solar cycle can be better worked out using long series of ground-based geomagnetic data.

Keywords

Flare index 146-day period geomagnetic planetary index geomagnetic field 

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Copyright information

© Indian Academy of Sciences 1987

Authors and Affiliations

  • D. R. K. Rao
    • 1
  • B. D. Kadam
    • 1
  1. 1.Indian Institute of GeomagnetismBombayIndia

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