Low-frequency kinetic waves in plasmas of magnetic loops at the early stage of flare process in active region
Heading:
| 1Kryshtal, AN, 1Voitsekhovska, AD, 1Gerasimenko, SV 1Space Research Institute of the National Academy of Sciences of Ukraine and State Space Agency of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2019, 35(3):3-33 |
| https://doi.org/10.15407/kfnt2019.03.003 |
| Start Page: Solar Physics |
| Language: Russian |
Abstract: Process of rise and development of low-frequency instability of kinetic Alfven waves and kinetic ion-acoustic waves in preflare solar plasma near the footpoints of magnetic loops, i. e. in the area, which corresponds to the height of low-middle chromospheres. The observational data obtained in the framework of international missions Hinode, SDO and IRIS demonstrate that magnetic field’s amplitude can vary in the interval from few tens up to few hundreds gausses. Existence of large-scale weak electric fields (“subdreicer” one, in generally accepted terminology) during enough long time (with respects to the time of instability development) can be considered in the framework of the waves’ generation in the investigated area. One more source of instability are slow drift motions of plasma which are the result of spatial inhomogeneties of temperature and density of medium. Our former investigations of the obtained solutions of dispersive relation for low-frequency kinetic waves, which are generated due to the development of correspond instabilities, have allowed to establish important: result for some semiempirical models of solar atmosphere the generated kinetic waves are the members of the only two families, namely “family of kinetic Alfven waves” and “family of kinetic ion-acoustic waves”. It has been proved, that considered wave generation can take place in plasma with pure Coulomb conductivity as well as in plasma with saturated small-scale Bernstein turbulence. This last one can appear in the investigated area as result of natural evolution of instability of the first harmonics of quasi-bernsteinian modes. This mode has much more low threshold with respect to the amplitude of subdreicer field than low-frequency kinetic waves. Except this fact the waves considered have enough low degree of plasma nonisothermality, which is needed for the appearance on instability. The principal possibility of existence of nondamped kinetic waves with small amplitudes in the area under investigation has been proved too. It is very important for the increase of probability of realization of the process of three-wave investigation and appearance of the spikes of microwave emission in preflare state of active region and, correspondently for making the combine short term prediction of a flare in it. |
| Keywords: flares, magnetic field, plasma instabilities, Sun, Sun activity |
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