TITLE

The Electron Firehose and Ordinary-Mode Instabilities in Space Plasmas

AUTHOR(S)
Lazar, M.; Poedts, S.; Schlickeiser, R.; Ibscher, D.
PUB. DATE
January 2014
SOURCE
Solar Physics;Jan2014, Vol. 289 Issue 1, p369
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Self-generated wave fluctuations are particularly interesting in the solar wind and magnetospheric plasmas, where Coulomb collisions are rare and cannot explain the observed states of quasi-equilibrium. Linear theory predicts that firehose and ordinary-mode instabilities can develop under the same conditions, which makes it challenging to separate the role of these instabilities in conditioning the space-plasma properties. The hierarchy of these two instabilities is reconsidered here for nonstreaming plasmas with an electron-temperature anisotropy T∥> T⊥, where ∥ and ⊥ denote directions with respect to the local mean magnetic field. In addition to the previously reported comparative analysis, here the entire 3D wave-vector spectrum of the competing instabilities is investigated, with a focus on the oblique firehose instability and the relatively poorly known ordinary-mode instability. Results show a dominance of the oblique firehose instability with a threshold lower than the parallel firehose instability and lower than the ordinary-mode instability. For stronger anisotropies, the ordinary mode can grow faster, with maximum growth rates exceeding those of the oblique firehose instability. In contrast to previous studies that claimed a possible activity of the ordinary-mode in the low β [< 1] regimes, here it is rigorously shown that only the high β [> 1] regimes are susceptible to these instabilities.
ACCESSION #
91933447

 

Related Articles

  • Multi-point observations of intermittency in the cusp regions. Echim, M. M.; Lamy, H.; Chang, T. // Nonlinear Processes in Geophysics;2007, Vol. 14 Issue 4, p525 

    In this paper we investigate the statistical properties of magnetic field fluctuations measured by the four Cluster spacecraft in the cusp and close to the interface with the magnetospheric lobes, magnetopause and magnetosheath. At lower altitudes along the outbound orbit of 26 February 2001,...

  • Absorption of fast magnetosonic waves in the solar atmosphere in the limit of weak nonlinearity. Ballai, Istva´n; Erde´lyi, Ro´bert; Goossens, Marcel // AIP Conference Proceedings;2000, Vol. 537 Issue 1, p144 

    We study the resonant absorption of fast magnetoacoustic (FMA) waves in inhomogeneous weakly dissipative, isotropic and anisotropic plasmas. The equilibrium states on which the waves are superimposed is static or stationary and are assumed to be in a 1-D planar geometry. The equilibrium model...

  • Nonclassical Transport and Particle-Field Coupling: from Laboratory Plasmas to the Solar Wind. Perrone, D.; Dendy, R.; Furno, I.; Sanchez, R.; Zimbardo, G.; Bovet, A.; Fasoli, A.; Gustafson, K.; Perri, S.; Ricci, P.; Valentini, F. // Space Science Reviews;Oct2013, Vol. 178 Issue 2-4, p233 

    Understanding transport of thermal and suprathermal particles is a fundamental issue in laboratory, solar-terrestrial, and astrophysical plasmas. For laboratory fusion experiments, confinement of particles and energy is essential for sustaining the plasma long enough to reach burning conditions....

  • Impact of solar wind depression on the dayside magnetosphere under northward interplanetary magnetic field. Baraka, S.; Ben-Jaffel, L. // Annales Geophysicae (09927689);Jan2011, Vol. 29 Issue 1, p31 

    We present a follow up study of the sensitivity of the Earth's magnetosphere to solar wind activity using a particles-in-cell model (Baraka and Ben Jaffel, 2007), but here during northward Interplanetary Magnetic Field (IMF). The formation of the magnetospheric cavity and its elongation around...

  • Magnetosheath dynamic pressure enhancements: occurrence and typical properties. Archer, M. O.; Horbury, T. S. // Annales Geophysicae (09927689);2013, Vol. 31 Issue 2, p319 

    The first comprehensive statistical study of largeamplitude (>100 %) transient enhancements of the magnetosheath dynamic pressure reveals events of up to ~15 times the ambient dynamic pressure with durations up to 3 min and an average duration of around 30 s, predominantly downstream of the...

  • Fluctuations of energetic particle flux during solar cycle based on measurements in the solar wind, in the magnetosphere, and at Earth. Starodubtsev, S. A.; Usoskin, I. G. // Astronomy Letters;Jun2010, Vol. 36 Issue 6, p438 

    We present the results of our studies of the cosmic-ray fluctuations in the frequency range 10−4−1.67 × 10−3 Hz based on energetic particle flux measurements on spacecraft in the solar wind, in the magnetosphere, and at Earth in the 11-year solar cycle. The cosmic-ray...

  • Spatial dependence of magnetopause energy transfer: Cluster measurements verifying global simulations. Palmroth, M.; Laitinen, T. V.; Anekallu, C. R.; Pulkkinen, T. I.; Dunlop, M.; Lucek, E. A.; Dandouras, I. // Annales Geophysicae (09927689);May2011, Vol. 29 Issue 5, p823 

    We investigate the spatial variation of magnetopause energy conversion and transfer using Cluster spacecraft observations of two magnetopause crossing events as well as using a global magnetohydrodynamic (MHD) simulation GUMICS-4. These two events, (16 January 2001, and 26 January 2001) are...

  • Interplanetary shock transmitted into the Earth's magnetosheath: Cluster and Double Star observations. Pallocchia, G.; Samsonov, A. A.; Cattaneo, M. B. Bavassano; Marcucci, M. F.; Rème, H.; Carr, C. M.; Cao, J. B. // Annales Geophysicae (09927689);May2010, Vol. 28 Issue 5, p1141 

    On day 7 May 2005, the plasma instruments on board Double Star TC1 and Cluster SC3 spacecraft register inside the magnetosheath, at 19:15:12 and 19:16:20 UT, respectively, a strong pressure pulse due to the impact of an interplanetary shock wave (IS) on the terrestrial bow shock. The analysis of...

  • Velocity-Space Proton Diffusion in the Solar Wind Turbulence. Voitenko, Y.; Pierrard, V. // Solar Physics;Nov2013, Vol. 288 Issue 1, p369 

    We study the velocity-space quasi-linear diffusion of the solar wind protons driven by oblique Alfvén turbulence at proton kinetic scales. Turbulent fluctuations at these scales possess the properties of kinetic Alfvén waves (KAWs) that are efficient in Cherenkov-resonant interactions. The...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics