Computer Science – Sound
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.4311p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A4, April 1, 1992, p. 4311-4316.
Computer Science
Sound
21
Coronal Holes, Heliosphere, Magnetohydrodynamic Waves, Solar X-Rays, Current Sheets, Solar Radiation, Solar Wind
Scientific paper
The question of why the sun heats the corona in active regions with an energy input of 10 exp 7 erg sq cm/s is addressed. It is argued that the trapped gas is heated by the intermittent dissipation of magnetic energy (nanoflares) at the current sheets that arise spontaneously in any magnetic field subject to continuous deformation. Most of the heat input is close to the sun, in the first 1-2 RS, raising the gas slowly out through the gravitational field and gradually accelerating it through the speed of sound at a distance of about 3-5 RS. The only source for the principle heat input close to the sun appears to be the network activity; thus the mass loss and the formation of the heliosphere are primarily a consequence of the smallest-scale activity supplemented by occasional flares and coronal mass ejections. The X-ray emission is largely a consequence of the smallest flares, the nanoflares, supplemented by occasional X-ray bursts from large flares.
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