Three Station Magnetometer Experiment at Antarctica During Jan-1996 to Determine the Velocity of Disturbed-time Overhead Auroral Current Systems.

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Brief Description (Abstract):

Three fluxgate magnetometers were operated simultaneously at the Antarctic locations Maitri and Orvin Mountains (71o 56.20' S lat., 08?45.79' E long.) in Jan 1996. The three stations form the vertices of a triangle with sides ranging from 76 km to 233 km. Using appropriate electronic filters to retain pulsation's with periods between 30 sec (f = 33 MHz) and 3000 sec (f = 0.33 MHz), pulsations in X, Y and Z components of the geomagnetic field were recorded. Pulsations during disturbed conditions are interpreted in terms of the mobile auroral current systems which drift over the stations and leave signatures in ground based magnetometers. From the time-lags in similar pulsations at the three stations, the drift velocities of the overhead small-scale ionospheric current systems are estimated. The values during Jan 1996 are found to lie between 0.94 km/sec and 3.44 km/sec, and these tally well with observations of 0.6 to 2 km/sec made for the northern auroral hemisphere.

Status: Completed

Purpose: India operates a permanent station Maitri (MAI) at Antarctica in the Schirmacher Oasis, round the year. In addition, two summer stations were operated at Dakshin Gangotri (DG) and Orvin Mountains (OR). The geomagnetic co-ordinates calculated from the IGRF 1995model for these three stations are MAI (66?53 S, 56?42 E), AE (66?22 S, 57?36 E) and OR (67? 42 S, 52?65 E). DG Station is on the Queen Maud Land ice-shelf at a distance of 76 km from MAI, whereas OR is situated to the west of the Wohlthat mountain range at a distance of 233 km from MAI. The three stations were operated simultaneously from 16 Jan1996, and were expected to run for about a month. OR camp recording however had to be stopped on 31 Jan, when following a very severe blizzard with wind.

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Supplemental Information:

TableDigital

Keyword(s): Earth Science-Solid Earth,

Place/Location(s): Maitri, Antarctic,

Project: Three Station Magnetometer Experiment at Antarctica During Jan-1996 to Determine the Velocity of Disturbed-time Overhead Auroral Current Systems,

Topic Category(s): GeoScientific Information,

Date(s): 2020-09-17 (Creation),

Resource Contact(s):
1. Name : Dr. Ajay Dhar
    Role : PrincipalInvestigator
    Phone : 8322525515
    E-Mail : ictd [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Distributor Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : Distributor
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Metadata Contact(s):
1. Name : Mr. Sakthivel Samy V
    Role : PointOfContact
    Phone : +91-832-2525515
    E-Mail : vssamy [ at ] ncpor.res.in
    Organization Name : National Centre for Polar and Ocean Research (NCPOR)
    Address : Headland Sada, Vasco da Gama, Goa 403804
    City : Vasco-da-Gama
    State : Goa
    Postal Code : 403804
    Country : IND

Extent:
Start Date : 1995-01-01
End Date   : 1996-12-31