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EP: Fachverband Extraterrestrische Physik

EP 7: Poster Erdnaher Weltraum

EP 7.1: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.IV

Decoding solar wind turbulence with kinetic instability theory of Kappa-distributed plasmas — •Marian Lazar — Theoretische Physik IV, Ruhr-Universität Bochum, 44780 Bochum, Deutschland

Understanding and predicting the transport of matter and radiation in the solar wind and terrestrial magnetosphere is one of the most challenging tasks facing space plasma scientists today. Space plasmas are poor-collisional and contain ample free energy. Kinetic effects prevail leading to wave fluctuations, whichtransfer the energy to small scales: wave-particle interactions replace Coulomb collisions and enhance dispersive effects heating particles and producing suprathermal (non-Maxwellian) populations observed at any distance in the heliosphere. The existing theories for the weak plasma turbulence almost limited to a Maxwellian approach are presently reconciled with the observations by modeling the dynamics of suprathermal populations with distribution functions of Kappa-type. The generalized Kappa distribution functions represent not only a convenient mathematical tool, but a natural and quite general state of space plasmas.