Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233..207d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 207-219.
Astronomy and Astrophysics
Astrophysics
35
Chromosphere, H Alpha Line, Photosphere, Sunspots, Transition Layers, Flow Distribution, Solar Activity, Solar Magnetic Field, Spacelab, Spectroheliographs, Ultraviolet Spectroscopy
Scientific paper
The flow patterns around a sunspot at photospheric, chromospheric, and transition zone temperatures is examined. The spiral fibril pattern observed in H-alpha is consistent with a constant alpha force-free field extrapolation of the photospheric magnetic field. Evidence is found for the first time that C IV fibrils near spots follow the field lines parallel to the chromospheric H-alpha fibrils. The observed large-scale pattern of redshifts and blueshifts in the vicinity of the sunspot is stable and conforms to the typical Evershed flow patterns of radial outflow at the photospheric levels and radial inflows at the chromospheric and transition region levels. The three-dimensional velocity vectors associated with this flow are derived assuming an axially symmetric Evershed flow.
Alissandrakis Constantine E.
Dere Ken P.
Schmieder Brigitte
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