Abstract
Lunar and luni-solar geomagnetic components have been computed upto four harmonics for low latitude station Alibag, outside equatorial electrojet belt, and the equatorial electrojet stations Annamalainagar, Kodaikanal and Trivandrum in the south Indian region. The computations are confined to data of very high solar activity period 1958–61. Amplitudes of lunar semidiurnal component (L2), in the horizontal intensity (H), undergo an equatorial enhancement. Phase difference of 2 hrs is noticed inL2(H) between nonelectrojet and electrojet stations. In the vertical intensity (Z), L2 is maximum ine andj-seasons at Trivandrum, close to the magnetic equator. Ind-season, however, maximumL2(Z) occurs at Annamalainagar (dip 5°.4N). The phase difference between the electrojet and nonelectrojet stations observed inL2(H) is not noticed inL2(Z). The differential vertical upward drift motion of charged particles may explain the observed phase difference inL2(H). Seasonal variations in amplitudes and times of maxima are noticed at all the stations inL2(H) andL2(Z). Similar variation is also noticed at Alibag inL2 of declination (D).
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