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Siphon flows in isolated magnetic flux tubes. V - Radiative flows with variable ionizationSteady 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.
Document ID
19930037556
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Montesinos, Benjamin
(Oxford Univ. United Kingdom; Rochester Univ., NY, United States)
Thomas, John H.
(Rochester Univ.; C.E.K. Mees Observatory, NY; Sydney Univ., Australia)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 402
Issue: 1
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
93A21553
Funding Number(s)
CONTRACT_GRANT: NAGW-2123
CONTRACT_GRANT: NAGW-2444
Distribution Limits
Public
Copyright
Other

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