FLARE MULTI-LINE 2D-SPECTROSCOPY |
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Authors: | MEIN P MEIN N MALHERBE J-M HEINZEL P KNEER F VON UEXKULL M STAIGER J |
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Institution: | (1) Observatoire de Paris, Section de Meudon, F-92195 Meudon Cedex, France;(2) Astronomical Institute, CZ-25165 Ond ejov, Czech Republic;(3) Universitäts-Sternwarte, Geismarlandstr. 11, D-37083 Göttingen, Germany;(4) Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, D-79101 Freiburg, Germany |
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Abstract: | A small flare was observed at the Teide Observatory on October 5, 1994. Simultaneous data were obtained at the German Vacuum Tower Telescope (VTT) with the MSDP spectrograph providing high-resolution imaging spectroscopy in two chromospheric lines, and the Gregory Coudé Telescope (GCT) providing information about the magnetic field. Basic flare characteristics are:The area of the flare kernel ( 2 x 2 arc sec) is similar in H and Caii 8542 Å.The early phase of the flare is characterized by a blue asymmetry in H and a red one in Caii 8542 Å line.The evolutions of line profiles are different; the red asymmetry observed in the Caii line is detected a few seconds later in H .The maximum asymmetry of the Caii line does not coincide with the maximum brightness.The flare occurs in a region of a strong horizontal gradient of the line-of-sight component of the magnetic field.Brightness and asymmetry in H and Caii are discussed in the context of standard flare models and velocity fields. Our observations suggest that a magnetic reconnection could occur at low levels of the solar atmosphere. |
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