Physics – Plasma Physics
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10510519h&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A5, p. 10519-10526
Physics
Plasma Physics
18
Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Numerical Simulation Studies, Space Plasma Physics: Wave/Wave Interactions, Space Plasma Physics: Waves And Instabilities
Scientific paper
Two instabilities could take place in plasma with a bi-Maxwellian proton distribution function with Tp∥>Tp⊥, where Tp∥ and Tp⊥ are proton temperatures, parallel and perpendicular, respectively, to the background magnetic field. The first instability is the fire hose (or whistler fire hose), generating low-frequency whistler waves at parallel propagation. We found a new, second instability, the Alfvén fire hose, that generates zero-frequency waves of the Alfvén branch at strongly oblique propagation. The Alfvén fire hose has a linear growth rate comparable to or even greater than that of the whistler fire hose. The two instabilities with the same initial plasma parameters are examined via one-dimensional hybrid simulations and turn out to have behavior very different from each other. The whistler fire hose has an overall quasi-linear evolution, while the evolution of the Alfvén fire hose is more complicated: Initially, unstable zero-frequency waves are gradually transformed into propagating Alfvén waves; during this process the waves are strongly damped and heat protons in a perpendicular direction. Consequently, the Alfvén fire hose is very efficient at destroying proton anisotropy.
Hellinger Petr
Matsumoto Haru
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