Ultraviolet Events Observed in Active Regions. II. an Interpretation of Flaring Arches and Associated Small Flares

Details Ultraviolet Events Observed in Active Regions. II. an Interpretation of Flaring Arches and Associated Small Flares Ultraviolet Events Observed in Active Regions. II. an Interpretation of Flaring Arches and Associated Small Flares

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491..925f&link_type=abstract

Astrophysical Journal v.491, p.925

Astronomy and Astrophysics

Astronomy

Sun: Activity, Sun: Flares, Sun: Uv Radiation, Sun: X-Rays, Gamma Rays

Scientific paper

We analyze H alpha , UV, and X-ray emissions in and around the spectacular arch system seen in the corona on 1980 March 27 during the Solar Maximum Mission. The flaring of the arch plasma is studied, and its dependence on triggering mechanisms related to the observed small limb flare in the arch footpoint is analyzed. To drive these events, we propose a mechanism in which small electric current circuits and the localized magnetic free energy are continuously generated at a magnetic null by a pressure gradient, which then compress or expand the plasma. This free energy dissipates by Joule effect and upward transport.

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