The Parker Instability

Details The Parker Instability The Parker Instability

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004assl..315..315k&link_type=abstract

How Does the Galaxy Work? A Galactic Tertulia with Don Cox and Ron Reynolds. Edited by Emilio J. Alfaro, Instituto de Astrofica

Astronomy and Astrophysics

Astrophysics

Scientific paper

We first clarify confusing terms for three unstable modes of the Parker instability in a perfectly conducting compressible plasma in the horizontal magnetic field and the vertical gravitational field. We call them as interchange, undular, and mixed modes following Matsumoto et al. (1993). We then provide three counter evidences for the notion that the Parker instability can form giant molecular clouds (GMCs): a short lifetime of the GMCs based on a recent turbulent picture, a stabilizing role played by the random component of the magnetic field, and a low degree of density enhancement brought by the instability. Instead, the instability may be responsible for corrugations in spiral arms.

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