Recently added

DSpace at IIG: Recent submissions

  • Interpretation of non-conventional coherent structures in magnetospheric plasma system 
    Steffy, S. V.; Ghosh, S. S. (2019)
    One of the natural laboratory for the study of solitary waves is the Earth's magnetosphere. The large gradient in particle properites at the magnetospheric boundary layers initiate the perturbation which leads to the ...
  • 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 ...
  • MAGSAT's contribution to geophysical surveys 
    Rajaram, Mita (1993)
    Magnetic Field Satellite (MAGSAT) data contains contribution from the earth's core, external currents and the crust; the data has been successfully utilised to derive information about each of these sources. Magsat provided ...
  • Distinctly Different responses of Equatorial F region during Undershielding and Overshielding Conditions 
    Hui, Debrup; Vichare, Geeta (2019)
    Disturbed time prompt penetration electric fields are observed to transmit instantaneously from high to low latitudes and are believed to effect the global ionosphere similarly. However, some new observations claim that ...
  • Quantitative Interpretation of Geomagnetic Induction Response Across the Thrust Zones of the Himalaya along the Ganga-Yamuna Valley 
    Reddy, C. D.; Arora, B. R. (1993)
    Geomagnetic variations, recorded through a two-phase magnetovariational study carried out along the Ganga-Yamuna valley of the Garhwal Himalaya, northwest India, are reduced to a set of induction arrows spanning a period ...
  • Linear macroscopic instabilities in space plasmas 
    Lakhina, G. S. (1994)
    Some of the linear macroinstabilities which can play important roles in space plasmas like the Earth's ionosphere and magnetosphere are discussed. Starting from the basic concept of plasma instabilities, we proceed to ...
  • Mesosphere/lower thermosphere prevailing wind model 
    Portnyagin, Yu.; Solovjova, T.; Merzlyakov, E.; Forbes, J.; Palo, S.; Ortland, D.; Hocking, W.; MacDougall, J.; Thayaparan, T.; Manson, A.; Meek, C.; Hoffmann, P.; Singer, W.; Mitchell, N.; Pancheva, D.; Igarashi, K.; Murayama, Y.; Jacobi, Ch.; Kuerschner, D.; Fahrutdinova, A.; Korotyshkin, D.; Clark, R.; Taylor, M.; Franke, S.; Fritts, D.; Tsuda, T.; Nakamura, T.; Gurubaran, S.; Rajaram, R.; Vincent, R.; Kovalam, S.; Batista, P.; Poole, G.; Malinga, S.; Fraser, G.; Murphy, D.; Riggin, D.; Aso, T.; Tsutsumi, M. (2004)
    The mesosphere/lower thermosphere (MLT) wind data from the 46 ground-based (GB) MF and meteor radar (MR) stations, located at the different latitudes over the globe, and the space-based (SB) HRDI data were used for ...
  • 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 ...
  • Solitary waves observed in the auroral zone: the Cluster multi-spacecraft perspective 
    Pickett, J. S.; Kahler, S. W.; Chen, L.-J.; Huff, R. L.; Santolik, O.; Khotyaintsev, Y.; Décréau, P. M. E.; Winningham, D.; Frahm, R.; Goldstein, M. L.; Lakhina, G. S.; Tsurutani, B. T.; Lavraud, B.; Gurnett, D. A.; André, M.; Fazakerley, A.; Balogh, A.; Rème, H. (2004)
    We report on recent measurements of solitary waves made by the Wideband Plasma Wave Receiver located on each of the four Cluster spacecraft at 4.5-6.5RE (well above the auroral acceleration region) as they cross field lines ...
  • 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), ...
  • An observation-driven model of the equatorial ionosphere - DEOS rocket campaign study 
    Sojka, J.J.; Eccles, J.V.; Thiemann, H.; Sridharan, R.; Lakhina, G. S.; Rao, P. B.; Schunk, R.W. (2002)
    An ionosphere model for a single, low-latitude, magnetic meridion is driven with observation-determined drivers to produce electron density specifications containing day to day ionospheric weather. The drivers are vertical ...
  • 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 ...
  • Proterozoic Mafic Dykes from the Southern Margin of Cuddapah Basin, India: Part 1 – Geochemistry and Petrogenesis 
    Goutham, M.R.; Subbarao, K.V.; Prasad, C.V.R.K.; Walsh, J.N.; Reddy, V. Damodara (2011)
    A palaeomagnetic and 40Ar/39Ar study is reported from a suiteof 41 mafic dykes comprising a dense E-W trending swarm intruding Archaean granitic basement near the southern margin of the Proterozoic Cuddapah basin in southern ...
  • 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 ...
  • Geomagnetic phenomena in the South Atlantic anomaly region in Brazil 
    Trivedi, N.B.; Pathan, B.M.; Schuch, Nelson J.; Barreto, M.; Dutra, L.G. (2005)
    The secular variation in the total geomagnetic field F and the westward drift of South Atlantic magnetic anomaly (SAMA) observed in Brazil during the 20th century are presented. According to the International Geomagnetic ...
  • Electrical Imaging of the Intracratonic Parnaíba Basin, North-Northeast Brazil 
    Arora, B. R.; Rigoti, A.; Vitorello, I.; Padilha, A. L.; Trivedi, N. B.; Chamalaun, F. H. (1997)
    Nighttime transient geomagnetic variations recorded by an array of 29 magnetometers in the equatorial region of north-northeast Brazil have been subjected to robust regression analysis in order to derive transfer functions ...
  • Variations of ULF and VLF During Moderate Geomagnetic Storm At Equatorial Region 
    Ahmad, S. N. A.; Jusoh, M. H.; Kasran, F. A. M.; Abdullah, M.; Veenadhari, B.; Uozumi, T.; Abe, S.; Yoshikawa, A.; Cardinal, M. G. (2015)
    This paper presents variations of Ultra Low Frequency (ULF) and Very Low Frequency (VLF) during moderate geomagnetic storm using ground based observatories, Magnetic Data Acquisition System (MAGDAS)/Circum-Pan ...