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Feng Chen   Submitted: 2010-08-19 21:26

EUV Imaging Telescope (EIT) waves are a wavelike phenomenon propagating outward from the coronal mass ejection source region, with expanding dimmings following behind. We present a spectroscopic study of an EIT wave/dimming event observed by the Hinode/Extreme-ultraviolet Imaging Spectrometer. Although the identification of the wave front is somewhat affected by the pre-existing loop structures, the expanding dimming is well defined. We investigate the line intensity, width, and Doppler velocity for four EUV lines. In addition to the significant blueshift implying plasma outflows in the dimming region as revealed in previous studies, we find that the widths of all four spectral lines increase at the outer edge of the dimmings. We illustrate that this feature can be well explained by the field line stretching model, which claims that EIT waves are apparently moving brightenings that are generated by the successive stretching of the closed field lines.

Authors: F. Chen, M. D. Ding and P. F. Chen
Projects: Hinode/EIS

Publication Status: Published in the ApJ
Last Modified: 2010-08-20 09:50
Go to main E-Print page  Damping of Magnetohydrodynamic Waves in Solar Prominence Fine Structures  Super-hot (T > 30 MK) Thermal Plasma in Solar Flares  Edit Entry  Download Preprint  Delete Entry 

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