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Now showing items 1-20 of 32

HF communication between India-Antarctica during 1992, and its dependence on a) Geomagnetic activity, b) Season

Jeeva, K.; Hanchinal, A.N.; Dhar, Ajay; Daga, D.M.; Rajaram, G. (1995)

Observations made at the Indian station Maitri in East Antarctica during the period spanning between July 1992 and January 1993, reveal that the state of HF communication between India and Antarctica is greatly dependent ...
Changes in the auroral electrojet currents inferred from geomagnetic field variations at Maitri and northern conjugate station

Kalra, Rajesh; Dhar, Ajay; Nair, K.U.; Jeeva, K.; Daga, D.M.; Rajaram, G. (1995)

Behaviour of geomagnetic variations over Maitri station, Antarctica through a calm to moderately calm and finally into a highly disturbed day, has been recorded. The data has been synthesized against similar observations ...
Optical Auroral Forms over Maitri during Antarctic winter 1994 and Their relationship with simultaneous geomagnetic variations

Hanchinal, A.N.; Sridharan, M.; Rajaram, G. (1997)

During the Antarctic winter of 1994 (Apr-Oct), the Indian Institute of Geomagnetism carried out one man campaign of auroral photography over the Indian stations MAITRI(MAI) and DAKSHIN GANGOTRI(DG). The idea was to study ...
Three-station magnetometer experiment at Antarctica during Jan-1996 to determine the velocity of disturbed-time overload auroral current systems

Dhar, Ajay; Patil, A.; Sankaran, S.; Rajaram, G. (1999)

Three fluxgate magnetometers were operated simultaneously at the Antarctic locations Maitri (70°45' S lat., 11'45' E Dakshin Gangotri (70'08' S lat., 12°E long.) and Orvin Mountains (71'56.20' S lat., 08'45.79' E long.) ...
Study of total magnetic field intensity variation (F) at Maitri, Antarctica variations over 1922-1996

Patil, A.; Dhar, Ajay; Sankaran, S.; Rajaram, G. (1999)

The total geomagnetic field intensity (F) was recorded at the Indian Antarctic Station, Maitri (MAI), during Jan 1996, using a Proton Precession Magnetometer (PPM). The PPM data was compared with the variations in intensity ...
Velocity of small-scale auroral current systems over MAITRI, Antarctica in Jan 1997

Elango, P.; Gudade, A.L.; Sankaran, S.; Dhar, Ajay; Rajaram, G. (2000)

In continuation of our earlier experiments operated at MAITRI, Antarctica, in Jan 1992, Jan 1995 and Jan 1996, to determine the velocity of disturbed-time overhead current systems, a similar experiment was conducted again ...
Response of the 30MHz and the fluxgate magnetometer at Maitri to onset of geomagnetic disturbance

Elango, P.; Bist, S.S.; Meshram, D.K.; Rajaram, G. (2000)

An attempt has been made to understand the physical processes in the auroral ionosphere over MAITRI (geog. coord. 70.75o S, 52.8°E) and their response to geomagnetic disturbances. After observing the signatures of auroral ...
GPS determination of the velocity and strain-rate fields on Schirmacher Glacier, central Dronning Maud Land, Antarctica

Sunil, P.S.; Reddy, C.D.; Ponraj, M.; Dhar, Ajay; Jayapaul, D. (2007)

Global positioning system (GPS) campaigns were conducted during the 2003 and 2004 austral summer seasons to obtain insight into the velocity and strain-rate distribution on Schirmacher Glacier, central Dronning Maud Land, ...
Geomagnetic and RIOmeter observations at Maitri during 22nd Expedition

Hanchinal, A.N.; Dhar, Ajay; Singh, A.K.; Pathan, B.M. (2008)
Geomagnetic field variation during winter storm at localized southern and northern high latitude

Devi, Babita; Dubey, Smita; Saini, Shailendra; Devi, Rajni; Wahi, Rashmi; Dhar, Ajay; Vijay, S.K.; Gwal, A.K. (2008)

This paper presents the effect of geomagnetic storm on geomagnetic field components at Southern (Maitri) and Northern (Kiruna) Hemispheres. The Indian Antarctic Station Maitri is located at geom. long. 66.03° S; 53.21° E ...
Effect of interplanetary magnetic field and disturb storm time on H component

Devi, Rajni; Dubey, Smita; Saini, Shailendra; Devi, Babita; Dhar, Ajay; Vijay, S.K.; Gwal, A.K. (2008)

A fluxgate digital magnetometer is used to study the variation of magnitude of H component during geomagnetic storm events of April, July and November 2004 at southern subauroral localized region at “MAITRI” (geom. lat. ...
Magnetic anomaly map for Bharati promontory, Larsemann Hills, East Antarctica

Reddy, C.D.; Dhar, Ajay (2008)
Declining magnetic field at Maitri, Antarctica

Pathan, B.M.; Dhar, Ajay; Asinkar, R.L.; Selvamurugan, R.; Hanchinal, A.N. (2009)

The Earth's magnetic field is due to huge electric current circulating in the core of the Earth. Geomagnetic field is mostly dipolar in nature although multi poles also have some contribution. However, the main complication ...
GPS derived velocity field and strain rates of schirmacher glacier East Antarctica

Sunil, P.S.; Reddy, C.D.; Dhar, Ajay; Ponraj, M.; Selvaraj, C.; Jayapaul, D. (2010)

Monitoring of ice sheet velocity is one of the key issues to glacier dynamics understanding. Although the surface displacements of glaciers can be monitored Global Positioning System (GPS), this process is difficult in ...
Preliminary study on the measurement of background radiation dose at Antarctica during 32 nd expedition

Bakshi, A.K.; Pal, Rupali; Dhar, Ajay; Chougaonkar, M.P. (2013)

A significant proportion (10%) of the natural background radiation is of cosmic origin. Cosmic ray consists of gamma, protons, electrons, pions, muons, neutrons and low Z nuclei. Due to the geomagnetic effect, cosmic ...
First results from imaging riometer installed at Indian Antarctic station Maitri

Behera, Jayanta K.; Sinha, Ashwini K.; Singh, A.K.; Rawat, Rahul; Vichare, Geeta; Dhar, Ajay; Pathan, B.M.; Nair, K.U.; Selvaraj, C.; Elango, P. (2014)

Cosmic noise absorption (CNA) measurred by imaging riometer, is an excellent tool to passively study the high latitude D-region ionospheric conditions and dynamics. An imaging riometer has been installed at Indian Antarctic ...
Schumann resonances observed at Maitri, Antarctica: diurnal variation and its interpretation in terms of global thunderstorm activity

Manu, S.; Rawat, Rahul; Sinha, Ashwini K.; Gurubaran, S.; Jeeva, K. (Current Science, 109, 4, P. 784-790, 2015)

Schumann resonances (SRs) are the AC components of the global electric circuit and are excited by the lightning activity within the Earth–ionosphere waveguide. An induction magnetometer, which was operated from the ...
Variation of surface electric field during geomagnetic disturbed period at Maitri, Antarctica

Victor, N. Jeni; Panneerselvam, C.; Kumar, C.P. Anil (2015)

The paper discusses on the variations of the atmospheric vertical electric field measured at sub-auroral station Maitri (70◦75 S, 11◦75 E), and polar station Vostok (78.5◦S, 107◦E) during the geomagnetic disturbances ...
Study Of Mass Distribution Of Near Surface Aerosols At Maitri, Antarctica

Ranjan, Ritweej Rajeev; Ghadai, Narayan Chandra; Iyer, K.N.; Joshi, H.P.; Dhar, Ajay; Rawat, Rahul; Pathan, B.M. (International Journal of Scientific Research and Engineering Studies, V. 2, no. 6, 2015, 2015-06)
Anomalous diurnal variation of atmospheric potential gradient and air-Earth current density observed at Maitri, Antarctica

Jeeva, K.; Gurubaran, S.; Williams, E.R.; Kamara, A.K.; Sinha, Ashwini K.; Guha, A.; Selvaraj, C.; Nair, K.U.; Dhar, Ajay (2016)

The scope of this paper is to explore the mechanisms operating over Maitri (70.76°S, 11.74°E, 117m above mean sea level), a coastal Antarctic station, that produce an anomalous fair-weather diurnal pattern of the atmospheric ...

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