Variation of lunar and solar geomagnetic tides with sunspot and geomagnetic activity

Details Variation of lunar and solar geomagnetic tides with sunspot and geomagnetic activity Variation of lunar and solar geomagnetic tides with sunspot and geomagnetic activity

Dec 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973papge.111.2291r&link_type=abstract

Pure and Applied Geophysics PAGEOPH, Volume 111, Issue 1, pp.2291-2299

Physics

Geophysics

2

Scientific paper

Solar and lunar geomagnetic tides in H at Alibag have been determined by spectral analysis of discrete Fourier transforms following the method of Black and the well-known Chapman-Miller method. The seasonal variation in L 2(H) is opposite to that in L 2(D) with maximum in the d season and minimum in the j season. In both H and D the enhancement due to sunspot activity is larger in lunar tide than in solar tide. Surprisingly, the enhancement due to magnetic activity is greater in L 2(H) than in S 1(H), while the contrary is true for declination. It is inferred that there is a local time component of the storm time variation contrary to the view expressed by Green and Malin. The enhancements in amplitudes L 2 and S 1 in H and D, due to sunspot activity and due to magnetic activity, have been separated. The results show that the amplitude at zero sunspot number increases with magnetic activity in all the four parameters, while the enhancement due to sunspot activity at different levels of magnetic activity decreases with increase of K p. But if both K p and R are increasing, when K p increases enhancement due to R decreases and when R increases enhancement due to K p decreases.

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