Large-Scale Structures in the Interstellar Medium

Details Large-Scale Structures in the Interstellar Medium Large-Scale Structures in the Interstellar Medium

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483..274k&link_type=abstract

Astrophysical Journal v.483, p.274

Astronomy and Astrophysics

Astronomy

Hydrodynamics, Ism: Structure, Turbulence, Magnetohydrodynamics: Mhd

Scientific paper

Large-scale ordered structures in the interstellar medium (ISM) are commonly explained as a manifestation of the various instabilities inherent to the motion of partially ionized, magnetized interstellar gas. We examined the process of creation of large-scale coherent eddy structures in the ISM characterized by the existence of fully developed small-scale turbulence with nonzero values of the hydrodynamic and magnetic helicities. The instability analysis shows that in such media large-scale ordered structures with characteristic scale l ~ 1--100 pc are generated. The generation coefficient of large-scale structures is determined by both the value of the hydrodynamic helicity and the combined influence of the drag force and magnetic helicity.

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