A note on the Weibel instability and thermal fluctuations

Details A note on the Weibel instability and thermal fluctuations A note on the Weibel instability and thermal fluctuations

2012-02-24

arxiv.org/abs/1202.5424v1

Ann. Geophys., 30, 427--431, 2012

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 2 figures, accepted by Ann Geophys

Scientific paper

10.5194/angeo-30-427-2012

The thermal fluctuation level of the Weibel instability is recalculated. It is shown that the divergence of the fluctuations at long wavelengths, i.e. the Weibel infrared catastrophe, never occurs. At large wavelengths the thermal fluctuation level is terminated by the presence of even the smallest available stable thermal anisotropy. Weibel fields penetrate only one skin depth into the plasma. When excited inside, they cause layers of antiparallel fields of skin depth width and vortices which may be subject to reconnection.

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