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Del Zanna Giulio, Schmieder Brigitte, Mason H., Berlicki Arkadiusz, Bradshaw S.

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

Solar Physics, 2006, vol. 239, pp. 173-191

Référence DOI : 10.1007/s11207-006-0184-4
Référence ADS : 2006SoPh..239..173D

Résumé :

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<SUP>-1</SUP>) 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 (

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