Equatorial electrojet in east Brazil longitudes |
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| Authors: | R G Rastogi H Chandra K Yumuto |
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| Institution: | 1.Physical Research Laboratory,Ahmedabad,India;2.Space Environment Research Center,Kyushu University,Fukuoka,Japan |
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| Abstract: | This paper describes the morphology of the equatorial electrojet (EEJ) along 45°W longitude in east Brazil, where the ground
magnetic (dip) equator is associated with the largest declination in the world. Daily range of the horizontal field (ΔH), as expected, was largest at the station in the chain closest to the dip equator, Sao Luiz (inclination −0.25°S). ΔZ was largest positive at Eusebio (inclination 9.34°S) and largest negative at Belem (inclination 7.06°N); both near the fringe
of EEJ belt. ΔZ at Sao Luiz during the daytime was unexpectedly large negative in-spite of a small dip and also located south of the dip
equator where ΔZ should be positive. Center of EEJ was found to be shifted southward of the dip equator by about 1° in latitude. During southern
summer, ΔY started decreasing from 00 h and reached a minimum value in the afternoon, an abnormal feature not discussed for any station
so far. The mid-day value of the direction of ΔH vector was 22°–24°W compared to the declination of 19°–21°W in the region. |
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