The generation of kinetic alfven waves in the loop's plasma in active region

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Space and Atmospheric Physics
1Kryshtal, AN, 2Gerasimenko, SV
1Main Astronomical Observatory of the NAS of Ukraine, Kyiv, Ukraine
2Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2004, 10 ;(4):081-091
https://doi.org/10.15407/knit2004.04.081
Publication Language: Russian
Abstract: 
In the framework of Heyvaerts–Priest–Rust model of flare process, the conditions of rise and development of the low-frequency plasma wave instabilities in the surface layer of a post-flare loop in a solar active region are investigated. The instability can rise at the definite height in a loop as a result of the collective action of several reasons, namely, the existence of large-scale magnetic field В in the loop as well as taking into account the limit value of the ion gyroradius, the influence of a weak ("subdreicer") electric field E, which is parallel to the magnetic field of the loop, and the drift plasma motions due to the existence of the spatial inhomogeneities of plasma density and temperature. The dispersion relation for quasi-perpendicular perturbations (with respect to Bo || Ео) is reduced to the polynomial of the 4-th order in reference to the reduced frequency. One of its roots, which corresponds to the kinetic Alfven wave, becomes unstable with respect to the small perturbations, and this instability has clearly expressed threshold.
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