Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..305g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 186, Feb. 1979, p. 305-316.
Astronomy and Astrophysics
Astronomy
5
Magnetic Disturbances, Photosphere, Solar Flares, X Ray Astronomy, Convective Flow, Energy Storage, Flow Velocity, Satellite Observation, Time Response
Scientific paper
The onset times of various X-ray brightenings and associated optical flarings are compared, and a possible explanation of the observed sequence of events is considered. The relationship between optical flares and 'long-enduring brightenings' (LEBs) is examined, and it is noted that certain magnetic regions on the sun become relatively inactive during the period preceding the development of an LEB there. It is argued that energy storage in the solar atmosphere before the onset of an LEB is not sufficient to sustain the subsequent activity. A model is proposed in which the preceding 'quiet' phase coincides with a reduced flow of energy into the solar atmosphere, which is associated with the development of a reservoir of heated plasma in the convection zone before that zone becomes unstable. Evidence is discussed that might be obtained to determine whether the energy released in an LEB is stored beneath the photosphere or in the solar atmosphere before the event.
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