Siphon flows in isolated magnetic flux tubes. V - Radiative flows with variable ionization

Details Siphon flows in isolated magnetic flux tubes. V - Radiative flows with variable ionization Siphon flows in isolated magnetic flux tubes. V - Radiative flows with variable ionization

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...402..314m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 1, p. 314-325.

Astronomy and Astrophysics

Astrophysics

30

Magnetic Flux, Magnetohydrodynamic Flow, Radiative Transfer, Solar Magnetic Field, Astronomical Models, Solar Atmosphere, Steady Flow

Scientific paper

Steady siphon flows in arched isolated magnetic flux tubes in the solar atmosphere are calculated here including radiative transfer between the flux tube and its surrounding and variable ionization of the flowing gas. It is shown that the behavior of a siphon flow is strongly determined by the degree of radiative coupling between the flux tube and its surroundings in the superadiabatic layer just below the solar surface. Critical siphon flows with adiabatic tube shocks in the downstream leg are calculated, illustrating the radiative relaxation of the temperature jump downstream of the shock. For flows in arched flux tubes reaching up to the temperature minimum, where the opacity is low, the gas inside the flux tube is much cooler than the surrounding atmosphere at the top of the arch. It is suggested that gas cooled by siphon flows contribute to the cool component of the solar atmosphere at the height of the temperature minimum implied by observations of the infrared CO bands at 4.6 and 2.3 microns.

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