146-day signal in the geomagnetic field—a probable association with the periodicity of the solar flare index |
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| Authors: | D R K Rao B D Kadam |
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| Institution: | (1) Indian Institute of Geomagnetism, 400005 Bombay, India |
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| 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. |
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| Keywords: | Flare index 146-day period geomagnetic planetary index geomagnetic field |
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