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Magnetic flux tubes as sources of wave generationThe structure of solar, and very likely stellar, surface magnetic fields is highly inhomogeneous: at the photospheric level, the fields are locally strong, and show concentration into a flux tube structure. In this case, the wave energy generated in stellar convection zones may be largely carried away by flux tube waves, which can then become important sources for the heating of the outer atmospheric layers. Such flux tube wave generation may help to explain the UV and X-ray fluxes observed by the IUE and Einstein observatories. The generation of longitudinal tube waves in magnetic flux tubes embedded in an otherwise magnetic field-free, turbulent, and stratified medium was considered. It is shown that compressible tube waves are generated by dipole emission and that the generation efficiency is a strong function of the magnetic field strength. Energy flux calculations are presented for different magnetic flux tubes, and show how the results depend on the magnetic field strength and the characteristics of the convective turbulence.
Document ID
19880003726
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Musielak, Z. E.
(NASA Marshall Space Flight Center Huntsville, AL., United States)
Rosner, R.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA., United States)
Ulmschneider, P.
(Heidelberg Univ. Germany)
Date Acquired
September 5, 2013
Publication Date
July 1, 1987
Publication Information
Publication: Colorado Univ., 5th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
Subject Category
Astrophysics
Accession Number
88N13108
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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