Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182..324v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 2, Aug. 1987, p. 324-328.
Astronomy and Astrophysics
Astrophysics
20
Coronal Loops, Magnetic Field Reconnection, Plasma Heating, Solar Corona, Solar Magnetic Field, Magnetohydrodynamic Flow, Photosphere
Scientific paper
Coronal heating connected with electric currents generated by cellular convective flows on the photosphere is discussed. These current systems represent a potential source of free energy which may be released by the complex reconnection processes. The latter may be treated phenomenologically (Heyvaerts and Priest, 1984) as the relaxation to the minimum energy state in a time scale τr. The relaxed state is determined by the constraint of global magnetic helicity conservation in highly conductive plasmas (Taylor, 1974). The model of an array of closely packed flux tubes (Parker, 1983; Browning et al., 1986) is considered, and such an approach allows to express the rate of coronal heating in terms of a photospheric driver.
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