Implication of Z Variations During a Near-Moon Equatorial Counterelectrojet on 6 March 1967, in the Indian Zone

摘要

The daily variations of geomagnetic H, D, Z were studied for the average of five internationally quiet days of March 1967, as also for a particular day (March 6, 1967), when a spectacular near-noon counterelectrojet occurred, at Trivandrum (about 30 km south of the dip equator) and Kodaikanal and Annamalainagar (about 170 km and 290 km north of dip equator) in the Indian zone. For the average quiet days, the electrojet seemed to be centered near dip equator in the morning, but shifted steadily southward over Trivandrum and beyond by evening. For the near-noon counterelectrojet day, single current systems flowing more than hundred kilometers to the north of the dip equator and/or double current systems, one normal near the dip equator and another reverse, about hundred kilometers or more to the north were indicated.