Astronomy and Astrophysics – Astronomy
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...42..135t&link_type=abstract
Solar Physics, vol. 42, May 1975, p. 135-156.
Astronomy and Astrophysics
Astronomy
145
Astronomical Models, Magnetic Field Configurations, Solar Corona, Solar Magnetic Field, Solar Rotation, Solar X-Rays, High Resolution, Lines Of Force, Skylab Program, Solar Physics, Spaceborne Astronomy, Synoptic Measurement
Scientific paper
Soft X-ray observations of coronal holes are analyzed to determine the structure, temporal evolution, and rotational properties of those features as well as possible mechanisms which may account for their almost rigid rotational characteristics. It is shown that coronal holes are open features with a divergent magnetic-field configuration resulting from a particular large-scale magnetic-field topology. They are apparently formed when the successive emergence and dispersion of active-region fields produce a swath of unipolar field founded by fields of opposite polarity, and they die when large-scale field patterns emerge which significantly distort the original field configuration. Two types of holes are described (compact and elongated), and three possible rotation mechanisms are considered: a rigidly rotating subphotospheric phenomenon, a linking of high and low latitudes by closed field lines, and an interaction between moving coronal material and open field lines.
Krieger Allen S.
Timothy A. F.
Vaiana Giuseppe S.
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