Kink mode m = 1 in thin plasma flex with discontinuous vertical magnetic field
Heading:
| 1Cheremnykh, OK, 2Kryshtal, AN, 1Tkachenko, AA 1Space Research Institute under NAS and National Space Agency of Ukraine, Kyiv, Ukraine 2Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2017, 33(3):3-24 |
| https://doi.org/10.15407/kfnt2017.03.003 |
| Start Page: Solar Physics |
| Language: Russian |
Abstract: In this paper, we study conditions of realization and stability of kink modes with azimuthal wave numbers m=±1 in cylindrical plasma flex with twisted magnetic field and homogeneous current along its axis. We assume permanent vertical magnetic fields inside and outside the flex, which is surrounded by currentless plasma, and outside its boundary azimuthal magnetic field decreases inversely proportional to the distance from the flex’s border. We derive dispersion equations for stable and unstable modes in approximation of «thin» plasma flex. Analysis of equations for the case of discontinuous vertical magnetic field on flex’s boundary is provided. Conditions of propagation of wave modes have been defined. We have obtained that unstable modes with m=±1 can’t be realized. Results can be applied for interpretation of solar magnetic tubes behavior, using measurements provided by the spacecrafts. |
| Keywords: kink modes, magnetic field, thin plasma flex |
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