Physics – Geophysics
Scientific paper
Dec 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972papge..95..131r&link_type=abstract
Pure and Applied Geophysics PAGEOPH, Volume 95, Issue 1, pp.131-140
Physics
Geophysics
2
Scientific paper
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 ( L 2), in the horizontal intensity ( H), undergo an equatorial enhancement. Phase difference of 2 hrs is noticed in L 2 (H) between nonelectrojet and electrojet stations. In the vertical intensity ( Z), L 2 is maximum in e and j-seasons at Trivandrum, close to the magnetic equator. In d-season, however, maximum L 2 (Z) occurs at Annamalainagar (dip 5°.4N). The phase difference between the electrojet and nonelectrojet stations observed in L 2 (H) is not noticed in L 2 (Z). The differential vertical upward drift motion of charged particles may explain the observed phase difference in L 2 (H). Seasonal variations in amplitudes and times of maxima are noticed at all the stations in L 2 (H) and L 2 (Z). Similar variation is also noticed at Alibag in L 2 of declination ( D).
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