Geomagnetic calm intervals and anomalous solar cycle 20 |
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Authors: | K G Sontakke N K Thakur G K Rangarajan |
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Institution: | (1) Indian Institute of Geomagnetism, 400 005 Bombay, India |
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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 |
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Keywords: | Quiet intervals geomagnetic activity solar activity |
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