Radiative Relaxation of Space Plasma Anisotropies

Details Radiative Relaxation of Space Plasma Anisotropies Radiative Relaxation of Space Plasma Anisotropies

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.71l&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

Anisotropic charge particle distributions are ubiquitous in space plasma. The solar wind originates in the near-Sun region where corona is heated and the plasma is accelerated to supersonic speeds in both a quasistatic form and the episodic events of coronal mass ejection (CME). Energetic flows of charge particles penetrate the space plasma leading to complex formations of counterstreaming plasmas. In such plasma systems the particle velocity distributions are anisotropic, and, therefore, unstable against the excitation of the electromagnetic instabilities of Weibel (or filamentation) type. Here it is shown that, for counterstreaming plasmas with non-thermal populations of Lorentzian type, typically encountered in magnetized interplanetary plasmas, these instabilities become the primary relaxation mechanism of the plasma system. In this case, the electromagnetic fields measured by the space probes can be used to determine space plasma parameters and the magnetic field.

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