How magnetic is the solar chromosphere?

Details How magnetic is the solar chromosphere? How magnetic is the solar chromosphere?

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..519s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 519-529.

Astronomy and Astrophysics

Astrophysics

68

Chromosphere, Solar Magnetic Field, Stellar Magnetic Fields, Magnetic Flux, Magnetohydrostatics, Solar Atmosphere, Stellar Models

Scientific paper

The lower solar chromosphere is thought to have a very inhomogeneous temperature structure, with hot magnetic flux tubes surrounded by cool (T less than 4000 K) nonmagnetic gas (Ayres et al., 1986). The effect of such a thermally bifurcated atmosphere on the structure of the magnetic field in the chromosphere is considered. It is shown that magnetic flux tubes expand much more rapidly if the atmosphere is thermally bifurcated than if it is homogeneous. They merge and form a magnetic canopy with an almost horizontal base which does not exceed approximately 800-1000 km above tau = 1, irrespective of the magnetic filling factor. Hence the middle and upper chromosphere is filled with a magnetic field almost everywhere on the sun. The consequences of this result both for the sun and for other late type stars are discussed.

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