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Christoph Kuckein (AIP)

Solar flares: a case study of the 2013 May 17 flare
When Jun 21, 2018 from 02:30 PM to 03:30 PM
What
  • Colloquium
Where SH Lecture Hall
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Solar flares are among the most energetic events in the solar system. Such a process involves the whole electromagnetic spectrum. Flares are classified with letters A, B, C, M or X according to the peak flux in the wavelength bands between 1-8 Å x-rays as measured by the Geostationary Operational Environmental Satellite system (GOES). The most energetic flares are of type X, followed by M-class flares. In order to understand the complex triggering process of flares, simultaneous multiwavelength observations to link different heights of the solar atmosphere are getting more and more important. However, the unpredictability of flares makes them extremely hard to observe with high resolution ground-based telescopes.

In this talk I will present a remarkable data set of an M-class flare observed on 2013 May 17 with multiple instruments and wavelengths during an observing campaign at the Vacuum Tower Telescope (VTT) at Observatorio del Teide, Tenerife, Spain. Several hours of observations covered the entire flare, including the pre-flare, impulsive, relaxation, and post-flare phases. Spectropolarimetric measurements of the four Stokes parameters in the upper chromosphere (He I triplet at 10830 Å) and in the underlying photosphere (Si I line at 10827 Å) allows to study the dynamics and infer information about the magnetic field during different stages of the flare. The analysis of all the data is still ongoing. I will report on what we have learnt (so far).