Anomalies in H at Indian equatorial stations and their effect on equatorial enhancements

Physics

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Equatorial Regions, Geomagnetism, Magnetic Anomalies, Magnetic Variations, Amplitude Distribution Analysis, Coasts, Ground Stations, India, Temporal Distribution

Scientific paper

The nature of anomalies at Indian equatorial stations has been studied through the use of transfer functions for anomalous horizontal and vertical fields. These functions are calculated for Annamalainagar (ANR) and Trivandrum (TRV) taking Kodaikanal (KOD) as a reference normal station. The period covered is 3-100 min. It is found that for periods below 10 min local induction starts playing a dominant role and anomalies are largely manifestations of a coastal effect. This effect causes a large suppression of H at TRV. At this station the source field effect is quite pronounced. Anomalies in the latitudinal profile of equatorial enhancement seen in the Indian sector are discussed in terms of source field geometry.

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