Geomagnetic solar and lunar daily variations at Alibag, India

Details Geomagnetic solar and lunar daily variations at Alibag, India Geomagnetic solar and lunar daily variations at Alibag, India

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984papge.122...89a&link_type=abstract

Pure and Applied Geophysics PAGEOPH, Volume 122, Issue 1, pp.89-109

Physics

Geophysics

Solar Daily Variation, Lunar Daily Variation, Solar-Cycle Modulation

Scientific paper

Geomagnetic solar and lunar daily variations S and L, at Alibag, India are derived, by the well-known Chapman-Miller method, from the series of homogeneous mean hourly magnetic data of the years 1932 to 1972. The data for all the three elements — declination D and horizontal and vertical intensities H and Z — are analysed, by dividing the data suitably for a study of the seasonal variations, the effect of the changes in the solar and magnetic activities on S and L, the oceanic dynamo contribution to L, and their interactions with each other. The main results are as follows.
(i)
For S the daily pattern and its seasonal progression conform to the type expected from a northern-hemisphere station. On the other hand, the amplitudes of all the four harmonics of L systematically have higher values in winter, and in D and Z the harmonics show large phase differences between summer and winter. The pattern of L in winter suggests that the lunar current system consists of a single set of vortices in the summer hemisphere rather than the conventional vortices, one set in each of the hemispheres.
(ii)
Solar-cycle modulation on the solar ranges as well as on the amplitudes of the first three harmonics of S is greater than that expected solely from the increase in E-region conductivity, whereas the corresponding modulation on L is comparable to that on the E-region conductivity.
(iii)
With increasing magnetic activity the first harmonic of S shows an increase, and the first three harmonics of L indicate a general decrease, in amplitude.
(iv)
Of the variability in S 96%, but in L only 32%, is found to be accounted for by the combined effect of the variations in the solar and magnetic activities.

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