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

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      https://www.ias.ac.in/article/fulltext/jess/096/02/0119-0122

    • Keywords

       

      Flare index; 146-day period; geomagnetic planetary index; geomagnetic field

    • 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.

    • Author Affiliations

       

      D R K Rao1 B D Kadam1

      1. Indian Institute of Geomagnetism, Bombay - 400005, India
    • Dates

       
  • Journal of Earth System Science | News

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