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Plasma diagnostics of an EIT wave observed by Hinode/EIS and SDO/AIA View all abstracts by submitter

Astrid Veronig   Submitted: 2011-11-16 01:46

We present plasma diagnostics of an EIT wave observed with high cadence inHinode/EIS sit-and-stare spectroscopy and SDO/AIA imagery obtained during theHOP-180 observing campaign on 2011 February 16. At the propagating EIT wavefront, we observe downward plasma flows in the EIS Fe XII, Fe XIII, and Fe XVIspectral lines (log T ~ 6.1-6.4) with line-of-sight (LOS) velocities up to 20km s-1. These red-shifts are followed by blue-shifts with upward velocities up to-5 km s-1 indicating relaxation of the plasma behind the wave front. During thewave evolution, the downward velocity pulse steepens from a few km s-1 up to 20km s-1 and subsequently decays, correlated with the relative changes of the lineintensities. The expected increase of the plasma densities at the EIT wavefront estimated from the observed intensity increase lies within the noiselevel of our density diagnostics from EIS XIII 202/203 Å line ratios. Nosignificant LOS plasma motions are observed in the He II line, suggesting thatthe wave pulse was not strong enough to perturb the underlying chromosphere.This is consistent with the finding that no Hα Moreton wave was associatedwith the event. The EIT wave propagating along the EIS slit reveals a strongdeceleration of a ~ -540 m/s2 and a start velocity of v0 ~ 590 km s-1. Thesefindings are consistent with the passage of a coronal fast-mode MHD wave,pushing the plasma downward and compressing it at the coronal base.

Authors: A.M. Veronig, P. G?m?ry, I.W. Kienreich, N. Muhr, B. Vrsnak, M. Temmer, H.P. Warren
Projects: Hinode/EIS,SDO-AIA

Publication Status: ApJ Lett., in press
Last Modified: 2011-11-16 13:19
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