The flare of Sepember 7, 1973 - A typical example of a newly recognized class of solar transients

Astronomy and Astrophysics – Astronomy

Scientific paper

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Extreme Ultraviolet Radiation, Solar Flares, Transient Response, Ultraviolet Astronomy, X Ray Astronomy, Energy Transfer, H Alpha Line, Magnetic Field Configurations, Mass Transfer, Optical Measurement, Solar Corona, Solar X-Rays

Scientific paper

X-ray, extreme-ultraviolet and optical observations of a solar flare are discussed. It is shown that the flare exemplifies a class of transient events characterized by long duration and long decay time and by the development of high systems of loops, generally brighter at the top. In contrast with compact short lifetime events, the distinctive properties of this class of transients are: (1) the disruption of the magnetic configuration at the flare onset, as indicated by prominence eruption or activation and by associated white-light coronal transients; (2) a continuous energy deposition, presumably at the top of loops, during a large fraction of the flare development and well after the intensity peak; (3) a continuous supply of additional material to the top of loops, with subsequent downflows and out-of-hydrostatic equilibrium conditions.

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