A Multi-Wavelength Study of the Compact M1 Flare on October 22, 2002 |
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| Authors: | G Del Zanna A Berlicki B Schmieder H E Mason |
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| Institution: | (1) MSSL, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, U.K.;(2) LESIA, Observatoire de Paris, F-92195 Meudon Principal Cedex, France;(3) Astronomical Institute of the Wrocław University, Wrocław, Poland;(4) Institute of Theoretical Astrophysics, University of Oslo, Blindern, N-0315 Oslo, Norway;(5) Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, CB3 OWA, U.K. |
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| Abstract: | In this paper we present a further study of the Ml class flare observed on October 22, 2002. We focus on the SOHO Coronal
Diagnostic Spectrometer (CDS) spectral observations performed during a multi-wavelength campaign with TRACE and ground-based
instruments (VTT, THEMIS). Strong blue-shifts are observed in the CDS coronal lines in flare kernels during the impulsive
phase of this flare. From a careful wavelength calibration we deduce upflows of 140 km/s for the Fe XIX flare emission, with
a pattern of progressively smaller flows at lower temperatures. Large line-widths were observed, especially for the Fe XIX
line, which indicate the existence of turbulent velocities. The strong upflows correspond to full shifts of the line profiles.
These flows are observed at the initial phase of the flare, and correspond to the “explosive evaporation”. The regions of
the blueshifted kernels, a few arc seconds away from the flare onset location, could be explained by the chain reaction of
successive magnetic reconnections of growing emerging field line with higher and higher overlying field. This interpretation
is evidenced by the analysis of the magnetic topology of the active region using a linear force-free-field extrapolation of
THEMIS magnetograms. |
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