Velocities in solar magnetic fluxtubes

Details Velocities in solar magnetic fluxtubes Velocities in solar magnetic fluxtubes

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...168..311s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 168, no. 1-2, Nov. 1986, p. 311-329.

Astronomy and Astrophysics

Astrophysics

139

Flow Velocity, Magnetic Flux, Magnetohydrodynamic Flow, Solar Flux, Iron, Photosphere, Spectral Line Width, Turbulence Effects, Wavelengths

Scientific paper

Stokes V zero-crossing wavelengths and I(V) profiles of a large number of unblended Fe I and II lines are used to study the velocities in solar magnetic flux tubes. No net flows are seen in the photospheric layers of flux tubes at disk center in both active region plages and the quiet network. Stokes V zero-crossing wavelength shifts relative to the wavelengths of the Stokes I profiles do not support the presence of downflows inside flux tubes. One dimensional LTE model calculations are used to show that the observed line profiles formed inside a flux tube can only be reproduced if the model profiles are broadened by velocity. The dependence of the total turbulent velocity on line strength in the flux tube is found to differ strongly from its dependence in the quiet photosphere.

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