The Evershed flow as a steady-state homogeneous phenomenon

Details The Evershed flow as a steady-state homogeneous phenomenon The Evershed flow as a steady-state homogeneous phenomenon

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...147...93d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 147, no. 1, June 1985, p. 93-102. Research supported by the Ministry of Scienc

Astronomy and Astrophysics

Astrophysics

29

Chromosphere, Photosphere, Solar Magnetic Field, Steady Flow, Sunspots, Astronomical Maps, Line Of Sight, Velocity Distribution

Scientific paper

The present observations of photospheric and chromospheric line-of-sight velocity, as well as the photospheric magnetic field, facilitate the comprehensive study of the Evershed (1909) flow, with emphasis on large scale, quasi-stationary characteristics of the flow and its association with the topology of the magnetic field. A multichannel subtractive double pass spectrograph was used to obtain line-of-sight velocity maps in H-alpha, together with the Meudon magnetograph. Computations are made for the components of the velocity vector as a function of distance from the center of the spot, under the assumption of axial symmetry. The radial component is the dominant one in both chromosphere and magnetosphere. The present analysis of the magnetograms, using current-free and force-free models, indicates that the velocity maximum occurs in regions where the magnetic field is almost horizontal in both layers; the results are judged to appear consistent with subsonic flow in magnetic flux tubes.

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