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Conference Papers/Abstracts/Posters/Talks/Presentations: Recent submissions

Now showing items 21-40 of 57

The low period atmospheric gravity waves observed using Very Low Frequency signals

Maurya, Ajeet K.; Cohen, Morris B.; Kumar, K. Niranjan; Phanikumar, D. V.; Singh, Rajesh (2019)

It has been known that the atmospheric gravity waves (AGWs) play a major role in shaping up the structure and dynamics of lower, middle and upper atmosphere [1, 2], and relates to various phenomena in the thermosphere. VLF ...
Holocene climate variability in the Himalayan region: preliminary results from lake sediments in the Spiti valley, India

Ambili, A.; Gaerber, S.; Prasad, S.; Brauer, A.; Basavaiah, N.; Kotlia, B. S. (2009)

The Himalayan region shows the presence of two rainfall regimes. During the winter months the mid-latitude westerlies provide more precipitation in the western Himalayas. During the monsoon months the ITCZ moves north ...
Vertical and latitudinal wave forcing observed with network of Radars over Indian region

Eswaraiah, S.; Venkat Ratnam, M.; Rao, S. Vijaya Bhaskara; Kosalendra, E.; Kumar, K. Kishore; Sathish Kumar, S.; Gurubaran, S. (2014)

It is well known that gravity waves and tides play an important role in delineating the middle atmospheric structure and dynamics. Significant advancement has been in recent days in understanding the role of gravity waves ...
Nonlinear electrostatic waves in a magnetized dusty plasma with two-temperature ions

Maharaj, S. K.; Bharuthram, R.; Pillay, S. R.; Singh, S. V.; Reddy, R. V.; Lakhina, G. S. (2008)

Nonlinear low frequency electrostatic waves which arise from the coupling between two linear modes, viz., the dust-acoustic and dust-cyclotron waves, are studied in a magnetized dusty plasma comprising Boltzmann electrons, ...
The effect of charge separation on nonlinear electrostatic waves in a magnetized dusty plasma with two-temperature ions

Maharaj, S. K.; Bharuthram, R.; Pillay, S. R.; Singh, S. V.; Reddy, R. V.; Lakhina, G. S. (2008)

In view of the observations of parallel (to Earth's magnetic field) spiky electric field structures by the FAST satellite, a theoretical study is conducted using a dusty plasma model comprising Boltzmann distributed hot ...
The Observation of Ionospheric Large-Scale Wave Structure In Southeast Asia

Yu-Yi, Liow; Buhari, Suhaila M; Abdullah, Mardina; Musa, Tajul Ariffin; Sundarsanam, Tulasiram (2019)

The occurrence of the equatorial plasma bubble (EPB) at nighttime always leads to the scintillation and fluctuation of radio wave signals from satellites. The observation in the seeding perturbation of EPB is important to ...
Waves-like signatures in the D-region ionosphere generated by solar flares

Maurya, Ajeet K; Singh, Rajesh; Kumar, Sushil; Kumar, D.V. Phani; Veenadhari, B. (2014)

The present study reports presence of periodic Wave-Like Signatures (WLS) in the D-region ionosphere detected using NWC, Australia, VLF navigational transmitter signal (19.8 kHz) observed at Allahabad, an Indian low latitude ...
Three-dimensional ionosphere tomography with GPS-TEC from GEONET in Japan

Yamamoto, Mamoru; Seemala, Gopi; Chen, Chia-Hung; Saito, Akinori (2014)

Measurement of ionospheric total electron content (TEC) by using the ground-based GPS receivers is now widely used. We can refer to it as GPS-TEC. As there are always several GPS satellites available for the measurement, ...
Cause and effect relationship between simultaneously observed geomagnetic pulsations and scintillations at low latitudes

Pavithran, Adhitya; Jayashree, B.; Seemala, Gopi; Sinha, Ashwini K; Vichare, Geeta; Kakad, Bharati (2019)

Ionospheric scintillations of radio waves at low latitudes are associated with electron density irregularities. It has been discussed earlier (Sinha et al., 2001) that these irregularities are field aligned and can drive ...
Ionospheric characteristics of low latitude anomaly zone over Indian region by ground based GPS, radio occultation and SPIM model predictions

Panda, Sampad Kumar; Gedam, Shirish S.; Rajaram, Girija (2013)

he present paper deals with investigation of ionospheric electron density over low latitude Indian region from seven ground based dual frequency global positioning system (GPS) stations across Indian region. The electron ...
Laminated sediments of the Garbyang palaeolake, Kumaun Tethys Himalaya -preliminary magnetic results

Kotlia, B.S.; Upreti, H.C.; Basavaiah, N. (2008)

The Quaternary history and geomorphology of the Himalaya is a result of the complex interaction between exceptionally active and accelerating Cenozoic tectonism sufficient to lift several massifs during the Quaternary ...
Characteristics of ElectroMagnetic Ion Cyclotron (EMIC) waves observed at Indian Antarctic station Maitri

Upadhyay, Aditi; Kakad, Bharati; Kakad, Amar; Omura, Yoshiharu; Sinha, Ashwini K. (2019)

The Electromagnetic Ion Cyclotron (EMIC) waves are the discreet electromagnetic emissions observed in the Earth's magnetosphere. The EMIC waves play an important role in the loss processes of highly energetic electrons ...
VLF perturbations associated earthquake precursors using subionospheric VLF signals

Maurya, Ajeet K.; Singh, Rajesh; Kumar, Sushil; Veenadhari, B. (2014-08)

Statistical results on the detection of lower ionospheric perturbations due to recent great earthquakes with M > 5.5 during the year 2009 in India, China, Bhutan and Indonesian regions, have been presented. The amplitude ...
Analysis and RF Test Drive of an Overhauser Sensor for Geomagnetic Field Measurements

Ramarao, B. V.; Pande, Manjiri; Joshi, Gopal; Dongre, Varun; Jacob, V. J.; Labade, Sachin (2019)

A co-axial cavity type overhauser sensor for geomagnetic field measurement has been analyzed. The cavity with free radical solution has inductance of 32 nH. A Radio Frequency (RF) matching network has been designed to ...
Sub-auroral characteristics of super-substorms as observed from Indian Antarctic station Maitri

Sinha, Shipra; Gokani, Sneha; Rawat, Rahul; Sinha, Ashwini K.; Vichare, Geeta (2019)

Super-substorms(SSS) are long duration events with SML <;-2500 nT, which are not so frequently observed. Characteristics of such sub-storms have not been studied in details so far. The case study of two shock induced ...
Seasonal and solar flux dependence of the growth and decay of intermediate scale ESF irregularities from VHF scintillation measurements

Bhattacharyya, A.; Kakad, B. (2014)

The ambient conditions required for the onset of equatorial spread F (ESF) irregularities have been the focus of numerous studies. However, for prediction of the strength and duration of scintillations on VHF and higher ...
Morphology of upward lightning discharges (the TLEs) from Indian Subcontinent

Singh, Rajesh (2019)

It is well known that terrestrial lightning discharge produce luminous emissions high above thunderstorms and these emissions electrically connect earth's troposphere to ionosphere. These high altitude luminous phenomena ...
Evaluation of groundwater potential and saline water intrusion using secondary geophysical parameters: A case study from western Maharashtra, India

Suneetha, N.; Gupta, Gautam (2018)

Aquifers along the coastal regions around the world are facing severe level of saline water intrusion problems. Rapid development and the associated increase in groundwater withdrawals intensify the problem. Extensive ...
Relativistic protons' (>20 MeV) observation deep into the inner magnetosphere

Pandya, Megha; Veenadhari, B. (2019)

Solar wind particles and the interaction of the Earth's magnetic field with the interplanetary drivers greatly affect the evolution of the inner magnetospheric particle. However, the relativistic protons are those uniquely ...
Implications of the Presence of Positrons in Earth’s Magnetosphere - Solitary Waves and Double Layers

Ghosh, S. S. (2019)

Recently, there has been a lot of interest in studying the linear and nonlinear waves in electron-positron (e-p) [ 1] and electron-positron-ion (e-p-i) plasmas [2]. Most of these works are focused on low frequency (ion ...

Now showing items 21-40 of 57

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