Physics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...76....3s&link_type=abstract
Solar Physics, vol. 76, Feb. 1982, p. 3-20.
Physics
34
Centrifuges, Impact Tests, Meteorite Craters, Projectile Cratering, Scaling Laws, Energy Of Formation, Geomorphology, Prototypes, Stratigraphy
Scientific paper
A model is described for the penetration into the corona of a new magnetic field of a developing bipolar region and for its interaction with an old large-scale coronal field. An important feature is a reconnection of the old and new fields inside the current sheet arising along the zero line of the total magnetic field calculated in the potential approximation. The magnetic reconnection and accumulation of plasma inside the current sheet can explain the appearance of dense coronal loops and the source of energy at their tops. The plasma, together with the magnetic lines, flows into the sheet from both sides. This explains the appearance of coronal cavities above the loops. If the large-scale field gradually decreases with height, the loop motion is slowed down. Taking into account the dipolar structure of the magnetic field at great heights explains the possibility of a rapid break of the new field through the corona and the appearance of transients and open field regions - the coronal holes. Here, a fast rising current sheet can be a source of accelerated particles and of a type II radio burst instead of the shock wave usually considered.
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