Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-06
Mon.Not.Roy.Astron.Soc. 314 (2000) 839-848
Astronomy and Astrophysics
Astrophysics
MNRAS, in press, 11 pages, 9 figures
Scientific paper
10.1046/j.1365-8711.2000.03408.x
The possibility of the magnetic flux expulsion from the Galaxy in the superbubble (SB) explosions, important for the Alpha-Omega dynamo, is considered. Special emphasis is put on the investigation of the downsliding of the matter from the top of the shell formed by the SB explosion which is able to influence the kinematics of the shell. It is shown that either Galactic gravity or the development of the Rayleigh-Taylor instabilities in the shell limit the SB expansion, thus, making impossible magnetic flux expulsion. The effect of the cosmic rays in the shell on the sliding is considered and it is shown that it is negligible compared to Galactic gravity. Thus, the question of possible mechanism of flux expulsion in the Alpha-Omega dynamo remains open.
Kulsrud Russell M.
Rafikov Roman R.
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