Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...205..868v&link_type=abstract
Astrophysical Journal, vol. 205, May 1, 1976, pt. 1, p. 868-873.
Physics
38
Solar Flares, Solar X-Rays, Time Response, Apollo Telescope Mount, Energy Transfer, Solar Magnetic Field, Solar Physics, Wave Propagation
Scientific paper
A solar flare which occurred on Sept. 5, 1973, is discussed on the basis of high temporal and spatial resolution pictures taken with the Skylab S-056 X-ray telescope. The temporal evolution of the flare is outlined, and magnetic-field data for the active region are compared with the soft X-ray observations. A close similarity between calculated magnetic-field lines and the overall structure of the X-ray core is shown to suggest that the flare occurred in an entire arcade of loops rather than in a single loop. Sequential brightening of different X-ray features is taken as an indication that some triggering disturbance moved from one side to the other in the flare core at velocities of 180 to 280 km/s. The two most intense X-ray features were found in places where the magnetic field composing the arcade had a small radius of curvature with horizontal field gradients higher than the surrounding area and where the axis of the arcade changed direction. It is suggested that a magetosonic wave triggered the energy releases as it propagated down the arcade and steepened the field gradients
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