Astronomy and Astrophysics – Astronomy
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..685h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 195, May 1981, p. 685-696.
Astronomy and Astrophysics
Astronomy
7
Cosmic Plasma, Interstellar Space, Magnetohydrodynamic Stability, Plasma Oscillations, Beta Factor, Cosmic Rays, Larmor Radius, Plasma Density, Plasma Equilibrium, Plasma Frequencies, Plasma Temperature, Pulsars
Scientific paper
The linear and nonlinear behavior of the firehose instability in interstellar space is described. Finite ion Larmor radius effects are considered, and the variation of the instability growth rate with wavelength and direction of wavevector is found. The maximum amplitude of irregularities arising from this instability is estimated, and the effect upon this of breaking of the first adiabatic invariant of the ions is examined. The density fluctuations associated with this instability are then discussed, and compared with those arising from the mirror instability. The occurrence of the firehose instability in the interstellar medium may have an important effect upon the propagation of cosmic rays in the Galaxy, and may also contribute to the production of small-scale density irregularities, which cause long time-scale pulsar scintillations.
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