NDLI: Coronal heating by stochastic magnetic pumping

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Coronal heating by stochastic magnetic pumping

Content Provider	NASA Technical Reports Server (NTRS)
Author	Sturrock, P. A. Uchida, Y.
Copyright Year	1980
Description	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 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. On combining this energy input with estimates of energy loss by radiation and of energy redistribution by thermal conduction, we obtain scaling laws for density and temperature in terms of length and coronal magnetic field strength.
File Size	682861
Page Count	19
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19800019786
Archival Resource Key	ark:/13960/t2p60cp9g
Language	English
Publisher Date	1980-06-01
Access Restriction	Open
Subject Keyword	Solar Physics Magnetic Flux Photosphere Solar Corona Magnetohydrodynamics Solar Flares Theoretical Physics Magnetohydrodynamic Waves Stochastic Processes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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