Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.207..109v&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 207, no. 1, p. 109-117
Astronomy and Astrophysics
Astrophysics
1
Ballooning Modes, Bubbles, Cosmic Rays, Dynamo Theory, Interstellar Magnetic Fields, Interstellar Matter, Magnetic Fields, Faraday Effect, Galactic Structure, Milky Way Galaxy, Shell Theory, Zeeman Effect
Scientific paper
Large (greater than 100 pc) interstellar magnetic bubbles are necessary in the cosmic-ray-driven fast galactic dynamo, as pioneered by Parker in 1992. In a first part, a look is made at the available data on nearby (less than 1000 pc) large interstellar magnetic bubbles. Here the magnetic field strength B in a large shell of density n around an OB association is found to be a few times greater than that outside in the general interstellar medium, varying typically like B approximately n, as expected for a shocked medium. In a second part, some tests are made of the predictions about interstellar magnetic bubbles made by the theory of a cosmic-ray driven fast galactic dynamo. The bubble tests generally support the idea of a cosmic-ray-driven fast galactic dynamo for the Milky Way.
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