Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2483...89p&link_type=abstract
In NASA-Goddard Space Flight Center, Theoretical Problems in High Resolution Solar Physics, 2 p 89-99 (SEE N88-11609 02-92)
Physics
5
Solar Limb, Solar Magnetic Field, Solar X-Rays, Stellar Coronas, Limb Brightening, Magnetic Field Reconnection, Magnetohydrodynamic Waves
Scientific paper
It has yet to be established why ordinary stars possess X-ray coronas. Detailed observations of the Sun make it doubtful that the X-ray corona is produced by the dissipation of Alfven waves. The uniform X-ray brightness over all scales from 10,000 to 100,000 km simply does not look like a resonance phenomenon. It is demonstrated that the arbitrary winding patterns introduced into the bipolar magnetic fields of X-ray corona produce discontinuities within the field. It is suggested that the random motions of the footprints of the field cause the accumulation of internal strains in the field, which dissipate through neutral reconnection across the associated discontinuities to provide the primary heat source for the X-ray corona. It is emphasized, however, that the essential high resolution observations of the Sun have yet to be carried out, and until the theory is firmly established for the Sun, it cannot be known how to interpret the X-ray emission of the Sun or of the other stars.
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