A dynamo theory of solar flares

Details A dynamo theory of solar flares A dynamo theory of solar flares

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...84..153k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 84, April 1983, p. 153-167.

Physics

49

Dynamo Theory, Solar Flares, Current Density, Electric Potential, Field Aligned Currents, Particle Acceleration, Plasma Heating

Scientific paper

It is proposed that the solar flare phenomenon can be understood as a manifestation of the electrodynamic coupling process of the photosphere-chromosphere-corona system as a whole. The system is coupled by electric currents, flowing along (both upward and downward) and across the magnetic field lines, powered by the dynamo process driven by the neutral wind in the photosphere and the lower chromosphere. A self-consistent formulation of the proposed coupling system is given. It is shown in particular that the coupling system can generate and dissipate the power of 10 to the 29th ergs/sec and the total energy of 10 to the 32nd during a typical life time (1000 sec) of solar flares. The energy consumptions include Joule heat production, acceleration of current-carrying particles along field lines, magnetic energy storage and kinetic energy of plasma convection. The particle acceleration arises from the development of field-aligned potential drops of 10-150 kV due to the loss-cone constriction effect along the upward field-aligned currents, causing optical, X ray, and radio emissions. The total number of precipitating electrons during a flare is shown to be of order 10 to the 37th to 10 to the 38th.

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