Movement of Indian Antarctic station Maitri into auroral oval during geomagnetic disturbance

• Main Authors: Banola, S., Dhar, Ajay, Rajaram, G.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 1997
• Subjects: Auroral oval; Indian Antarctic station; Electrojet; Auroral field; Maitri; Antarctic; Dakshin Gangotri; Indian; Antarc*
• Online Access: http://14.139.123.141:8080/jspui/handle/123456789/422

During the 13th Summer Indian Antarctic Expedition (Dec 1993 - March 1994), fluxgate magnetometers were operated at the Indian Antarctic locations MAITRI (MAI) and DAKSHIN GANGOTRI (DG). The variations of the X, Y, Z geomagnetic components when compared between magnetically Quiet days, moderately Disturbed days, and clearly Disturbed days, indicate that during quiet times, the Indian stations occupy a sub-auroral position; with increasing disturbance, they come into the auroral oval, and then the geomagnetic variations bear the signature of the auroral electrojet (AE) and field-aligned currents (FAC). Ionospheric horizontal current densities in the north-south and east-west directions are estimated from the variations in the geomagnetic components using the Biot-Savart law. They indicate that the current densities over MAI and DG increase with increasing electromagnetic disturbance in geospace, more sharply in the Dawn sector than in the Dusk sector.