On one type of three-wave interaction of low-frequency waves in magnetoactive plasma of the solar atmosphere
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| 1Kryshtal, AN, 1Gerasimenko, SV, 1Voitsekhovska, AD, 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) 2014, 30(3):58-70 |
| Start Page: Solar Physics |
| Language: Russian |
Abstract: We investigated a process of the appearance of decay «quasi-mode» instability of kinetic Alfven waves (KAW) in the chromosphere of a solar active region before a flare, namely, in plasma of magnetic loops near their footpoints. The process of decay of initial KAW into kinetic ion-acoustic wave and secondary KAW was considered as the specific type of three-wave interaction. Necessary conditions for the instability rise and development were obtained for two semiempirical models of the solar atmosphere. A modified expression for the growth rate of instability in the case of nonlinear interaction was used in the calculations. It was shown that the main criterions for such instability rise and development essentially depend on the external magnetic field’s amplitude in the area under investigation as well as on a model of the solar atmosphere. |
| Keywords: atmosphere, plasma, Sun |
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