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Browsing Polar Research by Author "Dhar, Ajay"

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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 ...
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 ...
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 ...
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. ...
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 ...
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 ...
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 ...
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, ...
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 ...
India’s Contribution to Geomagnetism and Allied Studies in Antarctica – A Review

Sinha, Ashwini K.; Dhar, Ajay; Singh, Anand K.; Behera, Jayanta K.; Gurubaran, S. (2017)

In this paper, we review the progress in Geomagnetism and allied areas based on the past thirty five Indian Antarctic expeditions and summarize the scientific results obtained in the last decade. Various dynamic processes ...
Magnetic anomaly map for Bharati promontory, Larsemann Hills, East Antarctica

Reddy, C.D.; Dhar, Ajay (2008)
Measurements of background radiation levels around Indian station Bharati, during 33rd Indian Scientific Expedition to Antarctica

Bakshi, A.K.; Prajith, Rama; Chinnaesakki, S.; Pal, Rupali; Sathian, Deepa; Dhar, Ajay; Selvam, T. Palani; Sapra, B.K.; Datta, D. (2017)

A comprehensive measurement of radioactivity concentrations of the primordial radionuclides 238U, 232Th and 40K and their decay products in the soil samples collected from the sites of Indian research stations, Bharati ...
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 ...
Sawtooth Variation of Horizontal Component with Solar Wind Conditions at High-Latitude

Devi, Rajni; Saini, Shailendra; Dhar, Ajay; Gwal, A.K. (2017)

We have examined three well-defined events of sawtooth oscillations in solar wind and magnetic field at high-latitude. For this study we have taken data of H component collected from digital fluxgate magnetometer at ...
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)
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 ...
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.) ...
Variability of the Horizontal Geomagnetic Field at High-Latitude during Sunspot Maximum

Devi, Rajni; Shailendra, Saini; Dhar, Ajay; Gwal, A.K. (2017)

In this paper we study the horizontal component of the Earth’s magnetic field and the effect of solar features on geospheric conditions is carried out and carried out at the Indian Antarctic Station “MAITRI”(geom. Lat. ...
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 ...

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