Christoph Kuckein (AIP)

Near-infrared spectropolarimetry of solar filaments
Wann Am 07.02.2014 von 10:30 bis 12:00
Was
  • Kolloquium
Wo SH, Hörsaal
Termin übernehmen vCal / iCal

Solar filaments form as elongated structures of dense plasma above magnetic polarity inversion lines. They appear as absorption features on the solar disk and in emission above the solar limb, where they are called prominences. On-disk filaments are conspicuous in the quiet Sun (quiescent filaments) and in active regions (active region filaments) when observed in strong chromospheric absorption lines, e.g., in the He I 1083 nm multiplet and the H-alpha 656.3 nm line. I will review the major properties and formation models of filaments, concentrating on active region filaments. I will introduce near-infrared spectropolarimetric observations in the He I 1083 nm spectral range acquired with the Vacuum Tower Telescope at Observatorio del Teide, Tenerife, Spain. In a comparative study, I analyze full Stokes spectra of the Si I 1082.7 nm line and the He I 1083 nm triplet by using three different inversion codes. Finally, I will discuss the infered vector magnetic field in the context of standard filament formation models.