On the possibility of the development of longitudinal wave instabilities on the background of the small-scale Bernstein turbulence in preflare chromosphere of a solar active region

1Kryshtal, AN, 1Voitsekhovska, AD, 1Gerasimenko, SV, 2Sidorenko, MV
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2014, 30(5):39-55
Start Page: Solar Physics
Language: Russian

We investigate the process of rise and development for instabilities of the longitudinal waves of two types, namely, low-frequency ion-acoustic and high-frequency (“electronic”) Langmuir ones, for preflare solar atmosphere plasma in an active region. The area under investigation is located at the chromosphere part of the flare loop near its footpoint. The large-scale weak electric field of flare loop is the main driver of these instabilities. The velocity of the electronic flow in preflare plasma is supposed to be much less than electron thermal velocity. Instability development is considered on the background of the small-scale Bernstein wave turbulence which exists in preflare plasma and has an extremely low threshold of excitation. The necessary conditions of the instability rise and development as well as the boundary values of the main characteristics of plasma and wave perturbations are obtained.

Keywords: Bernshtein's turbulence, chromosphere, Sun

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