Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985azh....62..965s&link_type=abstract
(Astronomicheskii Zhurnal, vol. 62, Sept.-Oct. 1985, p. 965-972) Soviet Astronomy (ISSN 0038-5301), vol. 29, Sept.-Oct. 1985, p.
Astronomy and Astrophysics
Astronomy
5
Current Sheets, Magnetic Field Reconnection, Magnetohydrodynamics, Solar Magnetic Field, Differential Equations, Lines Of Force, Ohmic Dissipation, Plasma Heating, Resistance Heating
Scientific paper
The process of magnetic reconnection in current sheets on the sun always occurs in the presence of a longitudinal magnetic field. Compression of the plasma inside a current sheet is accompanied by buildup of the longitudinal field. This leads to the appearance in a cross section of the sheet of an electric current circulating around it. Under the conditions of finite conductivity, the latter creates strong (if the compression is great) Joule heating of the plasma in the sheet. However, such heating is accomplished, in the final analysis, through annihilation of the primary or reconnecting components rather than the longitudinal magnetic field; the total flux of the longitudinal field is conserved, despite dissipation of the circulating current. This effect is small for high-temperature turbulent current sheets in the solar atmosphere, but it may be very important for cool and dense preflare sheets. The conclusions of the theoretical model of the phenomenon under consideration are compared with the results of numerical calculations of the evolution and structure of current sheets with longitudinal magnetic fields.
Somov Boris V.
Titov Viacheslav S.
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