49 Result(s)

Article

Nonlinear electrostatic structures and stopbands in a three-component magnetosheath plasma

Large amplitude parallel propagating electric field structures of nonlinear electron-acoustic waves are examined in an unmagnetized magnetosheath plasma. Based on the observations and simulations by Ergun et a...

O. R. Rufai, S. V. Singh, G. S. Lakhina in Astrophysics and Space Science (2023)

Reference Work Entry In depth

Electromagnetic Pulsations and Magnetic Storms

G. S. Lakhina, B. T. Tsurutani in Encyclopedia of Solid Earth Geophysics (2021)

Reference Work Entry In depth

Geomagnetically Induced Currents

G. S. Lakhina, R. Hajra, B. T. Tsurutani in Encyclopedia of Solid Earth Geophysics (2021)

Living Reference Work Entry In depth

Geomagnetically Induced Currents

G. S. Lakhina, R. Hajra, B. T. Tsurutani in Encyclopedia of Solid Earth Geophysics

Living Reference Work Entry In depth

Electromagnetic Pulsations and Magnetic Storms

G. S. Lakhina, B. T. Tsurutani in Encyclopedia of Solid Earth Geophysics

Article

Higher harmonic instability of electrostatic ion cyclotron waves

Electrostatic ion cyclotron instability pertaining to the higher harmonics of proton and helium cyclotron modes is investigated in three-component magnetised plasma consisting of beam electrons, protons and do...

T Sreeraj, S V Singh, G S Lakhina in Pramana (2019)

Article

Generation of Weak Double Layers and Low-Frequency Electrostatic Waves in the Solar Wind

We propose that the mechanism for the generation of weak double layers (WDLs) and low-frequency coherent electrostatic waves, observed by Wind in the solar wind at 1 AU, might be slow and fast ion-acoustic solito...

G. S. Lakhina, S. V. Singh in Solar Physics (2015)

Chapter and Conference Paper

An Overview of the Magnetosphere, Substorms and Geomagnetic Storms

The magnetosphere is the region of space to which the Earth’s magnetic field is confined by the solar wind plasma which is continuously being blown outward from the Sun. The magnetosphere of the Earth extends...

G. S. Lakhina, S. Alex, R. Rawat in Turbulence, Dynamos, Accretion Disks, Puls… (2008)

Reference Work Entry In depth

Humboldt, Alexander Von And Magnetic Storms

G.S. Lakhina, B.T. Tsurutani, W.D. Gonzalez… in Encyclopedia of Geomagnetism and Paleomagn… (2007)

Article

Critical Issues on Magnetic Reconnection in Space Plasmas

The idea of expedient energy transformation by magnetic reconnection (MR) has generated much enthusiasm in the space plasma community. The early concept of MR, which was envisioned for the solar flare phenomen...

A. T. Y. Lui, C. Jacquey, G. S. Lakhina, R. Lundin, T. Nagai… in Space Science Reviews (2005)

Article

Non-linear high-frequency waves in the magnetosphere

Using fluid theory, a set of equations is derived for non-linear high-frequency waves propagating oblique to an external magnetic field in a three-component plasma consisting of hot electrons, cold electrons a...

S. Moolla, R. Bharuthram, S. V. Singh, G. S. Lakhina in Pramana (2003)

Article

Interplanetary Shocks, Magnetopause Boundary Layers and Dayside Auroras: The Importance of a Very Small Magnetospheric Region

Dayside near-polar auroral brightenings occur when interplanetary shocks im**e upon the Earth's magnetosphere. The aurora first brightens near local noon and then propagates toward dawn and dusk along the au...

B.T. Tsurutani, X.-Y. Zhou, V.M. Vasyliunas, G. Haerendel… in Surveys in Geophysics (2001)

Article

Dromion solutions for an electron acoustic wave and its application to space observations

The nonlinear evolution of an electron acoustic wave is shown to obey the Davey-Stewartson I equation which admits so called dromion solutions. The importance of these two dimensional localized solutions for rece...

S S Ghosh, A Sen, G S Lakhina in Pramana (2000)

Article

Sun-Earth connection: Boundary layer waves and auroras

Boundary layers are the sites where energy and momentum are exchanged between two distinct plasmas. Boundary layers occurring in space plasmas can support a wide spectrum of plasma waves spanning a frequency r...

G S Lakhina, B T Tsurutani, J K Arballo, C Galvan in Pramana (2000)

Article

Broadband Plasma Waves In The MagnetopauseAnd Polar Cap Boundary Layers

Boundary layers occurring in the magnetosphere can support a wide spectrumof plasma waves spanning a frequency range of a few mHz to tens of kHz andbeyond. This review describes the main characteristics of the...

G. S. Lakhina, B. T. Tsurutani in Surveys in Geophysics (1999)

Article

Jeans-Buneman instability in a dusty plasma

A self consistent formulation of the Jeans instability of a dusty plasma with proper inclusion of charge dynamics is described. It is shown that charge fluctuations significantly affect the Jeans as well as th...

B P Pandey, G S Lakhina in Pramana (1998)

Article

Mhd Study of Coronal Waves: A Numerical Approach

The solar corona, modelled by a low β, resistive plasma slab sustains MHD wave propagations due to footpoint motions in the photosphere. The density, magnetic profile and driver are considered to be neither ve...

S. Parhi, B.P. Pandey, M. Goossens, G.S. Lakhina… in Astrophysics and Space Science (1997)

Article

Oblique solitary Alfvén modes in relativistic electron-positron plasmas

In electron-positron plasmas the charge-to-mass ratio is the same for both species. This leads for different waves to the vanishing of certain coefficients in the dispersion laws and nonlinear evolution equati...

Frank Verheest, G. S. Lakhina in Astrophysics and Space Science (1996)

Article

Shear flow instabilities in the Earth’s magnetotail

Shear flow instability is studied in the Earth’s magnetotail by treating plasma as compressible. A dispersion relation is derived from the linearized MHD equations using the oscillating boundary conditions at ...

R. V. Reddy, G. S. Lakhina in Annales Geophysicae (1996)