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Effect of small-scale bernstein turbulence on low-frequency plasma waves in the preflare solar chromosphere

  • Solar Physics
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Abstract

The studied region is a part of the current circuit of a magnetic loop in a solar active region in the altitude range of 1400–2500 km above the photosphere. At the earliest stage of development of a flare process, the magnetic field of the loop was assumed to be stationary and uniform in the interval corresponding to weak fields (the so-called deca-hectogauss fields). The conditions for emergence and development of instability of the second harmonic of Bernstein modes in this previously unexamined region were determined. This instability (and low-frequency instabilities emerging later) was assumed to be caused by the sub-Dreicer electric field of the loop, while pair Coulomb collisions were considered to be the major factor hindering its development. The obtained extremely low instability thresholds point to the possibility of subsequent emergence of low-frequency instabilities (and plasma waves corresponding to them) with much higher threshold values against the background of saturated Bernstein turbulence. The frequency of electron scattering by turbulence pulsations in this scenario normally exceeds the frequency of pair Coulomb (primarily ion–electron) collisions. Both the quasistatic sub-Dreicer field in the loop and the weak spatial inhomogeneity of plasma temperature and density were taken into account in the process of derivation and analysis of the dispersion relation for low-frequency waves. It was demonstrated that the solutions of the obtained dispersion relation in the cases of prevalent pair Coulomb collisions and dominant electron momentum losses at pulsations of saturated Bernstein turbulence are morphologically similar and differ only in the boundary values of perturbation parameters. In both cases, these solutions correspond to the two wave families, namely, kinetic Alfven waves and kinetic ion acoustic waves. These waves have their own electric fields and may play the important role in the process of preflare acceleration of energetic electrons.

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Authors and Affiliations

  1. Space Research Institute, National Academy of Sciences of Ukraine and State Space Agency of Ukraine, Kyiv, 03680, Ukraine

    A. N. Kryshtal, A. D. Voitsekhovska, S. V. Gerasimenko & O. K. Cheremnykh

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  1. A. N. Kryshtal
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  2. A. D. Voitsekhovska
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  3. S. V. Gerasimenko
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  4. O. K. Cheremnykh
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Correspondence to A. N. Kryshtal.

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Original Russian Text © A.N. Kryshtal, A.D. Voitsekhovska, S.V. Gerasimenko, O.K. Cheremnykh, 2017, published in Kinematika i Fizika Nebesnykh Tel, 2017, Vol. 33, No. 4, pp. 3–28.

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Kryshtal, A.N., Voitsekhovska, A.D., Gerasimenko, S.V. et al. Effect of small-scale bernstein turbulence on low-frequency plasma waves in the preflare solar chromosphere. Kinemat. Phys. Celest. Bodies 33, 149–165 (2017). https://doi.org/10.3103/S0884591317040031

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