Abstract
view Abstract Citations (169) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Coronal heating by stochastic magnetic pumping Sturrock, P. A. ; Uchida, Y. Abstract Recent observational data cast serious doubt on the widely held view that the sun's corona is heated by traveling waves (acoustic or magnetohydrodynamic). It is here proposed that the energy responsible for heating the corona is derived from the free energy of the coronal magnetic field derived from motion of the 'feet' of magnetic field lines in the photosphere. Stochastic motion of the feet of magnetic field lines leads, on the average, to a linear increase of magnetic free energy with time. This rate of energy input is calculated for a simple model of a single thin flux tube. The model appears to agree well with observational data if the magnetic flux originates in small regions of high magnetic field strength as proposed by Tarbell et al. (1979). On combining this energy input with estimates of energy loss by radiation and of energy redistribution by thermal conduction, scaling laws are obtained for density and temperature in terms of length and coronal magnetic field strength. Publication: The Astrophysical Journal Pub Date: May 1981 DOI: 10.1086/158926 Bibcode: 1981ApJ...246..331S Keywords: Atmospheric Heating; Magnetic Pumping; Photosphere; Solar Corona; Solar Magnetic Field; Stochastic Processes; Free Energy; Magnetic Flux; Solar Atmosphere; Solar Physics; Traveling Waves; Solar Physics full text sources ADS |
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