The 'melon-seed' mechanism and coronal transients

Details The 'melon-seed' mechanism and coronal transients The 'melon-seed' mechanism and coronal transients

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...94..387p&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 94, Sept. 1984, p. 387-411.

Physics

16

Coronal Loops, Diamagnetism, Magnetic Field Configurations, Solar Corona, Solar Magnetic Field, Field Strength, Integral Equations, Pressure Effects, Solar Flares, Solar Prominences, Velocity Distribution

Scientific paper

Adopting the point of view that a coronal transient is a defined magnetic structure, it must be diamagnetic with respect to the external ambient magnetic field, i.e., the external field lines cannot penetrate the structure. If this is so, an integral approach involving only external forces can be very useful for studying the conditions for acceleration and large-scale dynamical behavior of the transient. The author demonstrates the diamagnetic approach to this problem through a particularly simplified model. Necessary conditions for upward acceleration of the transient are discussed in some detail. The author has studied the equilibrium conditions and dynamical behavior of the transient using the mechanism for two limiting cases - that in which the gas pressure in the structure dominates over the magnetic pressure and that in which the magnetic pressure dominates. Based upon the above results, he suggests that the acceleration of the transient and the two-ribbon flare both may be produced by a common force, namely that provided by the constricting effect of the external magnetic field displaced by the presence of the structure.

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