Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...702...27j&link_type=abstract
The Astrophysical Journal, Volume 702, Issue 1, pp. 27-38 (2009).
Astronomy and Astrophysics
Astronomy
15
Sun: Corona, Sun: Coronal Mass Ejections: Cmes, Sun: Magnetic Fields, Sun: Uv Radiation
Scientific paper
We investigate the outflows associated with two halo coronal mass ejections (CMEs) that occurred on 2006 December 13 and 14 in NOAA 10930, using the Hinode/EIS observations. Each CME was accompanied by an EIT wave and coronal dimmings. Dopplergrams in the dimming regions are obtained from the spectra of seven EIS lines. The results show that strong outflows are visible in the dimming regions during the CME eruption at different heights from the lower transition region to the corona. It is found that the velocity is positively correlated with the photospheric magnetic field, as well as the magnitude of the dimming. We estimate the mass loss based on height-dependent EUV dimmings and find it to be smaller than the CME mass derived from white-light observations. The mass difference is attributed partly to the uncertain atmospheric model, and partly to the transition region outflows, which refill the coronal dimmings.
Chen Peng-Fei
Ding Ming-De Ding
Fang Chen
Imada Shin
Jin Meng
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