Freiburg 2008 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 4: The Sun and Heliosphere - Poster Session
EP 4.5: Poster
Montag, 3. März 2008, 17:30–19:00, Vorraum KGI-Aula
Signature of mass supply to quiet coronal loops — H. Tian1,2, •E. Marsch1, C.-Y. Tu2, J.-S. He2, and G.-Q. Zhou2 — 1Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Germany — 2Department of Geophysics, Peking University, Beijing, China
We compare the significant NeVIII blue shifts, which are visible as large blue patches on the Doppler-shift map of a middle-latitude quiet-Sun region observed by SUMER, with the coronal magnetic-field structures as reconstructed from a simultaneous photospheric magnetogram by means of a force-free-field extrapolation. We show for the first time that coronal funnels also exist in the quiet Sun. The region studied contains several small funnels that originate from network lanes, expand with height and finally merge into a single wide open-field region. However, the large blue shifts of the NeVIII line are not generally associated with funnels. A comparison between the projections of coronal loops onto the solar x-y-plane and the NeVIII dopplergram indicates that there are some loops that reveal large NeVIII blue shifts in both legs, which is reported for the first time, and some loops with upflow in one and downflow in the other leg. Our results suggest that strong plasma outflow, which can be traced by large NeVIII blue shift, is not necessarily associated with the solar wind originating in coronal funnels but appears to be a signature of mass supply to coronal loops.