Hydraulic concentration of magnetic fields in the solar photosphere. III - Fields of one or two kilogauss

Details Hydraulic concentration of magnetic fields in the solar photosphere. III - Fields of one or two kilogauss Hydraulic concentration of magnetic fields in the solar photosphere. III - Fields of one or two kilogauss

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..259p&link_type=abstract

Astrophysical Journal, vol. 204, Feb. 15, 1976, pt. 1, p. 259-267.

Astronomy and Astrophysics

Astrophysics

37

Magnetic Field Configurations, Magnetohydrodynamics, Solar Atmosphere, Solar Granulation, Solar Magnetic Field, Dynamo Theory, Field Strength, Force-Free Magnetic Fields, Heat Transfer, Magnetic Effects, Magnetic Flux, Magnetohydrodynamic Waves, Photosphere, Self Consistent Fields

Scientific paper

Detailed analysis of weak and strong lines suggests that the magnetic fields in isolated intense flux tubes in supergranule boundaries in the solar photosphere may be as large as 2000 gauss. This paper is a concise systematic review of hydrodynamic effects that might compress a magnetic field to great intensity. The properties of force-free fields are reviewed to show that they do not contribute to concentration of magnetic fields, in spite of the popular notion to the contrary. Of the seven effects considered, it is concluded that only cooling of the gas within the field can produce the high field densities inferred from observation. It is shown that inhibition of convection appears not to possess the necessary qualitative cooling features and that overstability, generating transverse hydromagnetic waves - essentially Alfven waves - is the only way to account for the cooling and field intensification.

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