Open AccessSeparation of Lunar Daily Geomagnetic Variations into Parts of Oceanic and Ionospheric Origin in the Indian Region
Author(s) -
Sastri N. S.,
Rao D. R. K.
Publication year - 1971
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1971.tb01820.x
Subject(s) - ionosphere , equatorial electrojet , earth's magnetic field , geology , dynamo , electrojet , geophysics , variation (astronomy) , climatology , geodesy , physics , astronomy , magnetic field , quantum mechanics
Summary Seasonal changes and variation in the equatorial region of the lunar semi‐diurnal component in H and Z , separated into parts of oceanic and ionospheric origin by Malin's method, are examined for four Indian observatories, three in the equatorial electrojet region and one outside it. The results suggest that the amplitudes of both the oceanic and ionospheric parts in H and Z are in general smallest in the j ‐season. The ionospheric part in H shows equatorial enhancement. The ocean dynamo contribution is smaller than that of the ionospheric part. At Kodaikanal, an inland station about 130 km from the nearest coast, the magnitude of the oceanic part is still considerable.