Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...71..329l&link_type=abstract
Solar Physics, vol. 71, June 1981, p. 329-336.
Astronomy and Astrophysics
Astronomy
10
Energy Dissipation, Line Spectra, Oso-8, Solar Corona, Solar Flares, Solar Spectra, Carbon, Electron Density (Concentration), Gas Ionization, Radiant Flux Density, Solar Magnetic Field, Solar Physics, Spaceborne Astronomy, Tearing Modes (Plasmas)
Scientific paper
The rapid dissipation of flare energy has been observed in the transition-zone line of C IV at 1548.2 A using the University of Colorado spectrometer aboard OSO-8. Impulsive brightenings have been resolved with characteristic rise times as low as 3.5s. One event is analyzed in detail, and it is inferred that the electron density is greater than 2 x 10 to the 11th/cu cm at a temperature of 60,000 K, and that the flare energy is deposited at a rate of 2 ergs/cu cm per sec or greater. The temporal behavior of the intensity at the center of the C IV line is consistent with a nonequilibrium ionization of C III through C V. If this event is a result of the multiple tearing mode instability as the primary energy release mechanism, then the observations indicate a preflare magnetic field of about 175 G.
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