Combined space and ground based observations of a C-1 flare

Physics

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Sun, Xuv, Flares

Scientific paper

We present temporally and spatially resolved space and ground based observations of a C1 flare. Ground based spectroheliograms were acquired at the Dunn Solar Tower of NSO/Sacramento Peak in several chromospheric lines. Simultaneously, the Coronal Diagnostic Spectrograph (CDS) aboard SoHO was used to obtrain rasters of the same active region in transiton region (TR) and coronal lines. This unique dataset provides us, for the first time, with spatially resolved observations of velocity fields during the impulsive phase of the flare, from the chromosphere up to the TR and the corona. At the time of the emission peak, a large area of the flaring kernel observed in TR lines is characterized by upward velocities. A ~6"×6" kernel displays upflows velocity above 80 km s-1. In this same area we found, in data obtained about 3 minutes later, chromospheric downflows of 10 - 20 km s-1. This is the first time that opposite directed flows at different atmospheric levels are observed in the same spatial location during a flare.

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