The Gradual Phase of the X17 Flare on October 28, 2003

Details The Gradual Phase of the X17 Flare on October 28, 2003 The Gradual Phase of the X17 Flare on October 28, 2003

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..239..173d&link_type=abstract

Solar Physics, Volume 239, Issue 1-2, pp. 173-191

Physics

8

Scientific paper

We present SOHO/CDS observations taken during the gradual phase of the X17 flare that occurred on October 28, 2003. The CDS data are supplemented with TRACE and ground-based observations. The spectral observations allow us to determine velocities from the Doppler shifts measured in the flare loops and in the two ribbon kernels, one hour and a half after the flare peak. Strong downflows (>70 km s-1) are observed along the loop legs at transition-region temperatures. The velocities are close to those expected for free fall. Observations and results from a hydrodynamic simulation are consistent with the heating taking place for a short time near the top of the arcade. Slight upflows are observed in the outer edges of the ribbons (<60 km s-1) in the EUV lines formed at log T < 6.3. These flows could correspond to the so-called “gentle evaporation.” At “flare” temperatures (Fe xix, log T = 6.9), no appreciable flows are observed. The observations are consistent with the general standard reconnection models for two-ribbons flares.

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