Regensburg 2007 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 8: Sonne

EP 8.6: Talk

Wednesday, March 28, 2007, 15:15–15:30, H46

ChroTel: Full-disk observations of the solar chromosphere — •Christian Bethge and Hardi Peter — Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg

In June 2006, a new robotic telescope was installed at the solar observatory at Tenerife to observe the full disc of the Sun. The goal of this 15 cm Chromospheric Telescope (ChroTel) is to observe the solar chromosphere in its three most prominent spectral lines: Ca II K (393 nm), H-alpha (656 nm) and He I (1083 nm). This will be done with a cadence below one minute and a spatial resolution of about two arcseconds. It will be the first synoptic telescope providing images in all these three lines, and it is the only instrument next to a full-scale solar telescope. Thus the Doppler maps to be acquired in the He I channel can be calibrated by spectroscopic observations.

Through an analysis of intensities and Doppler shifts in the chromosphere, ChroTels observations aim to increase our understanding of eruptive processes in the solar atmosphere, such as flares or coronal mass ejections, of the structure and dynamics of prominences and the role of the chromosphere in general.

The current status of the project and first images will be presented.