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On the nature of spectral line broadening in solar coronal dimmings View all abstracts by submitter

Laurent Dolla   Submitted: 2011-02-24 04:34

We analyze the profiles of iron emission lines observed in solarcoronal dimmings associated with coronal mass ejections, using the EUVImaging Spectrometer on board Hinode. We quantify line profiledistortions with empirical coefficients (asymmetry and peakedness)that compare the fitted Gaussian to the data. We find that theapparent line broadenings reported in previous studies are likely tobe caused by inhomogeneities of flow velocities along the line ofsight, or at scales smaller than the resolution scale, or by velocityfluctuations during the exposure time. The increase in the amplitudeof Alfvén waves cannot, alone, explain the observed features. Adouble-Gaussian fit of the line profiles shows that, both for dimmingsand active region loops, one component is nearly at rest while thesecond component presents a larger Doppler shift than that derivedfrom a single-Gaussian fit.

Authors: Dolla, L. R. and Zhukov, A. N.
Projects: Hinode/EIS,STEREO

Publication Status: ApJ 2011, 730, 113
Last Modified: 2011-03-11 11:42
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