PLR_Upper_Atmosphere_Reprints: Recent submissions

Now showing items 1-20 of 32

On the response of the mesopause region over an Indian Antarctic station Bharati to the geomagnetic storm of 23–24 March 2023

Parihar, Navin; Singh, Anand Kumar; Padincharapad, Saranya; Saini, Shailendra (2024-01)

We report, in this work, the changes in the thermal structure of the mesosphere-lower thermosphere (MLT) region over an Indian Antarctic station Bharati (69.4 ◦ S, 76.2 ◦ E, CGM coordinates 75 ◦ S, 97 ◦ E) brought about ...
Simultaneous observations of atmospheric vertical potential gradient from coastal Antarctic stations Bharati and Maitri

Jeeva, Krishnamoorthy; Vichare, Geeta; Seemala, Gopi K.; Kulkarni, Atul S.; Paramasivan, Elango; Moulik, Subrata; Soman, Anoop K.; Saikia, Pranjal (2023-12)

Simultaneous observations of the atmospheric electric potential gradient (PG) at Bharati and Maitri stations were studied from 2014 to 2016. A new regional diurnal pattern of fair-weather PG for the coastal Antarctic region, ...
Chemical and isotopic characterization of lakes in the Larsemann Hills, East Antarctica

Resmi, T.R.; Gopinath, Girish; Sunil, P.S.; Praveenbabu, M.; Arjun, P.; Rawat, Rahul (2022)

The ionic and isotopic ratios of some lakes in the Larsemann Hills in East Antarctica are determined to assess the lakes’ chemical and isotopic evolution. The lakes occupied the natural depressions carved by glacial abrasions ...
Isotope hydrochemistry of the lakes in Schirmacher Oasis, East Antarctica

Gopinath, G.; Resmi, T. R.; Praveenbabu, M.; Pragath, M.; P.S., Sunil; Rawat, R. (2020)

The study aims to find out the ionic and isotopic compositions of some lakes in the Schirmacher Oasis in east Antarctica. The water samples were collected from 12 lakes near the Indian Antarctic station, Maitri. The chemistry ...
Breaking Antarctica Icebergs: What Does It Mean For India?

Gawali, P.B. (2017)
Enhancement and modulation of cosmic noise absorption in the afternoon sector at subauroral location (L = 5) during the recovery phase of 17 March 2015 geomagnetic storm

Behera, Jayanta K.; Sinha, Ashwini K.; Vichare, Geeta; Bhaskar, Ankush; Honary, Farideh; Rawat, Rahul; Singh, Rajesh (2017)

The present study has focused on the intense production of cosmic noise absorption (CNA) at Maitri, Antarctica (L = 5; CGM −62∘S, 55∘E) during the early recovery phase of the largest storm of the current solar cycle ...
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 ...
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. ...
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 ...
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 ...
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 ...
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 ...
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 ...
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)
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 ...
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, ...
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 ...
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. ...

Now showing items 1-20 of 32

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