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Now showing items 1-20 of 57

Dust‐acoustic Waves with a Non‐thermal Ion Velocity Distribution

Singh, S. V.; Lakhina, G. S.; Bharuthram, R.; Pillay, S. R. (2002)

The effect of a non-thermal ion velocity distribution is studied on linear and nonlinear dust-acoustic waves in an unmagnetized three component dusty plasma. For the linear theory, electrons are Boltzmann distributed, ions ...
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 ...
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 ...
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, ...
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 ...
Development of intermediate-scale structure in the nighttime equatorial ionosphere

Bhattacharyya, A. (2010)

Equatorial plasma bubbles (EPBs), a phenomenon observed in the nighttime equatorial ionosphere, are an important component of space weather. EPBs are associated with irregularities of the ionospheric plasma that span a ...
Mirror Modes in the Heliosheath

Tsurutani, B. T.; Guarnieri, F. L.; Echer, E. E.; Lakhina, G. S.; Verkhoglyadova, O. P. (2010)

Mirror mode (MM) structures are identified in the Voyager 1 heliosheath magnetic field data. Their characteristics are: (1) quasiperiodic structures with a typical scale size of {approx}57 {rho}{sub p}(proton gyroradii), ...
Estimation of D‐region Electron Density using Tweeks Measurements at Nainital and Allahabad

Pant, P.; Maurya, A. K.; Singh, Rajesh; Veenadhari, B.; Singh, A. K. (2010)

Lightning generated radio atmospheric that propagates over long distances via multiple reflections through the boundaries of the Earth‐ionosphere waveguide (EIWG), shows sharp dispersion near the cut‐off frequency ∼1.8 kHz ...
On The Propagation And Modulation Of Electrostatic Solitary Waves Observed Near The Magnetopause On Cluster

Pickett, J. S.; Christopher, I. W.; Grison, B.; Grimald, S.; Santolík, O.; Décréau, P. M. E.; Lefebvre, B.; Engebretson, M. J.; Kistler, L. M.; Constantinescu, D.; Chen, L.‐J.; Omura, Y.; Lakhina, G. S.; Gurnett, D. A.; Cornilleau‐Wehrlin, N.; Fazakerley, A. N.; Dandouras, I.; Lucek, E. (2011)

We present the results of a study of Electrostatic Solitary Waves (ESWs) in which propagation of a series of noncyclical ESWs is observed from one Cluster spacecraft to another over distances as great as tens of km and ...
Space weather effects on the performance of satellite-based communication systems: Space weather and radio communication

Bhattacharyya, Archana (2012)

Effects of space weather on the performance of satellite-based communication/ navigation systems have been studied for several decades. A major concern is the predictability of these effects. Apart from the effects produced ...
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 ...
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 ...
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, ...
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 ...
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 ...
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 ...
22 July 2009 Total Solar Eclipse induced Wave-like-signatures (WLS) in the Lower Ionosphere: inferred using VLF observations

Maurya, Ajeet Kumar; Venkateshm, K.; Singh, Rajesh (2015)

In the present work, we have focused on the generation and detection of solar eclipse caused wave-like-signature (WLS) in the lower ionosphere using VLF navigation signal form NWC (19.2 kHz) VLF transmitter recorded at ...
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 ...
A nonlinear fluid model for weak double layers and electrostatic waves in the solar wind

Lakhina, G.S.; Singh, S.V. (2019)

Weak double layers (WDLs) and coherent electrostatic waves in the range of frequencies above the proton plasma frequency, f pi , and smaller than or of the order of the electron plasma frequency, f pe , have been observed ...
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 ...

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