caa a22 4500 44534704X CHVBK 20180317142832.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s11207-011-9852-0 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9852-0 Coronal Dimmings and the Early Phase of a CME Observed with STEREO and Hinode /EIS [Elektronische Daten] [C. Miklenic, A. Veronig, M. Temmer, C. Möstl, H. Biernat] We investigate the early phase of the 13 February 2009 coronal mass ejection (CME). Observations with the twin STEREO spacecraft in quadrature allow us to compare for the first time in one and the same event the temporal evolution of coronal EUV dimmings, observed simultaneously on-disk and above-the-limb. We find that these dimmings are synchronized and appear during the impulsive acceleration phase of the CME, with the highest EUV intensity drop occurring a few minutes after the maximum CME acceleration. During the propagation phase two confined, bipolar dimming regions, appearing near the footpoints of a pre-flare sigmoid structure, show an apparent migration away from the site of the CME-associated flare. Additionally, they rotate around the ‘center' of the flare site, i.e., the configuration of the dimmings exhibits the same ‘sheared-to-potential' evolution as the postflare loops. We conclude that the motion pattern of the twin dimmings reflects not only the eruption of the flux rope, but also the ensuing stretching of the overlying arcade. Finally, we find that: i)the global-scale dimmings, expanding from the source region of the eruption, propagate with a speed similar to that of the leaving CME front; ii)the mass loss occurs mainly during the period of strongest CME acceleration. Two hours after the eruption Hinode/EIS observations show no substantial plasma outflow, originating from the ‘open' field twin dimming regions. Springer Science+Business Media B.V., 2011 Coronal mass ejections nationallicence Flares nationallicence Miklenic C. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut Veronig A. Kanzelhöhe Observatory-IGAM, Institute of Physics, University of Graz, Universitätsplatz 5, 8010, Graz, Austria aut Temmer M. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut Möstl C. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut Biernat H. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut Solar Physics Springer Netherlands 273/1(2011-10-01), 125-142 0038-0938 273:1<125 2011 273 11207 https://doi.org/10.1007/s11207-011-9852-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9852-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Miklenic C. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut NATIONALLICENCE 700 1- Veronig A. Kanzelhöhe Observatory-IGAM, Institute of Physics, University of Graz, Universitätsplatz 5, 8010, Graz, Austria aut NATIONALLICENCE 700 1- Temmer M. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut NATIONALLICENCE 700 1- Möstl C. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut NATIONALLICENCE 700 1- Biernat H. Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, 8042, Graz, Austria aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 273/1(2011-10-01), 125-142 0038-0938 273:1<125 2011 273 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer