Freiburg 2008 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 4: The Sun and Heliosphere - Poster Session

EP 4.3: Poster

Montag, 3. März 2008, 17:30–19:00, Vorraum KGI-Aula

Cool loops in the solar transition region above the chromospheric magnetic network — •Hardi Peter, Sven Bingert, and Pia Zacharias — Kiepenheuer-Institut für Sonnenphysik, Freiburg

Maps of the solar transition region in emission lines formed over a temperature range around 100.000 K show loop-like structures which have been interpreted previously as being "luke-warm" loops actually following magnetic field lines connecting opposite polarities in the chromospheric magnetic network. New 3D MHD models challenge this picture and suggest that the low-lying loops indicate the presence of currents and do not follow the magnetic field lines.

We will discuss these results and compare the EUV emission line spectra synthesized from the 3D MHD models to observations from SUMER/SOHO and EIS/Hinode in terms of Doppler shifts, line widths and temporal variability to support our conclusions.