Influence of small-scale Bernstein turbulence on the low-frequency plasma waves in the solar chromosphere
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| 1Kryshtal, AN, 1Voitsekhovska, AD, 1Gerasimenko, SV, 2Cheremnykh, OK 1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine 2Space Research Institute under NAS and National Space Agency of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2017, 33(4):3-28 |
| https://doi.org/10.15407/kfnt2017.04.003 |
| Start Page: Solar Physics |
| Language: Russian |
Abstract: The region of investigation in this problem is the part of current circuit of magnetic loop in solar active region in the range of the heights from 1400 up to the 2500 kilometers above the photosphere. At the earliest phase of the development of a flare process the loop's magnetic field was supposed to be stationary and uniform in the interval, which correspond to the «weak» fields (so called «Deca-hectogauss» fields). The conditions of appearance and development of instability of second harmonics of the Bernstein modes have been obtained. The main reason of this instability's development as well as low-frequency instabilities, which appear later, the subdreicer electric field in a loop has been assumed. At the same time the pair Coulomb collisions were supposed to be the main reason of all the instabilities damping. The obtained extremely low values of this instability's threshold point to the principal possibility of the next appearance of the low-frequency instabilities (and plasma waves, which correspond to them) with much more high threshold values on the background of saturated Bernstein turbulence. In the framework of such scenario the scattering frequency of electrons on the pulsations of this Bernstein turbulence exceeds, as a rule, the frequency of pair Coulomb (basically the ion-electron one) collisions. In the process of obtaining and investigation of the dispersion relation for low-frequency waves the weak spatial inhomogeneity of plasma temperature and density together with existence of large-scale quasi-static subdreicer field have been taken into account. It has been shown that solutions of obtained dispersion relation in case, when pair Coulomb collisions dominate in plasma as well as in the case, when electron momentum losses on the pulsations of Bernstein saturated turbulence dominate, are the «morphologically» similar and differ only by the values of the perturbation parameters. In both these cases all the solutions correspond to the only two «families» of the waves, namely to the kinetic Alfven waves (KAW) and to the kinetic ion-acoustic waves (KIAW). These waves have their own electric fields and they can play very important role in the process of preflare acceleration of energetic electrons. |
| Keywords: Alfven waves, Bernstein turbulence, chromosphere, the Sun |
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