Bremen 2017 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

EP: Fachverband Extraterrestrische Physik

EP 4: Sonne und Heliosphäre I

EP 4.1: Hauptvortrag

Dienstag, 14. März 2017, 14:00–14:30, GW2 B2880

A new view of the solar atmosphere through IRIS — •Hardi Peter — Max Planck Institute for Solar System Research, Göttingen, Germany, peter@mps.mpg.de

The magnetic and dynamic connection through the different regimes of the solar atmosphere provides one of the major challenges in solar physics. Covering temperatures from below ten thousand to above ten million degrees, NASA's Interface Region Imaging Spectrograph (IRIS) is optimized to follow the fast processes in the solar atmosphere at unprecedented resolution in the near and far ultraviolet. IRIS provided new insights over a range of topics, ranging from small-scale transient energetic events in the chromosphere, magnetic and helical structures in the upper solar atmosphere, non-thermal particle acceleration in active regions to the dynamics in flares. Spectroscopic observations highlight the role of reconnection and its nature in the chromosphere and transition region. In particular, the important role of plasmoids in reconnection events has been emphasized and very strong heating of chromospheric plasma was found that provides new evidence on an atmospheric structure that is more complex than thought before. In combination with numerical modeling it became clear that many of the observed spectra can only be understood if the energetic particles are produced in small-scale reconnection events, which then excite the observed transition region lines. In this and other areas, IRIS has been very successful in providing new insight into a range of open issues in solar atmospheric physics, and poses new questions that motivate new theoretical and observational work.