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    • Keywords


      Quiet intervals; geomagnetic activity; solar activity

    • Abstract


      Long period variations in the occurrence of prolonged intervals of calm magnetic field conditions are studied using index Ap of magnetic activity. The solar-cycle variation in occurrence is compared with the sunspot number. Anomalous behaviour for solar cycle 20, observed in other solar parameters, are shown to be manifested in the occurrence frequency of quiet intervals. Spectral characteristics of occurrence indicates a dominant long period variation of about 30 years and a more feeble 11-year oscillation

    • Author Affiliations


      K G Sontakke1 N K Thakur1 G K Rangarajan1

      1. Indian Institute of Geomagnetism, Bombay - 400 005, India
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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