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Velocity Characteristics of Evaporated Plasma Using Hinode/EIS View all abstracts by submitter

Ryan Milligan   Submitted: 2009-02-25 09:58

This paper presents a detailed study of chromospheric evaporation using the EUV Imaging Spectrometer (EIS) onboard Hinode in conjunction with HXR observations from RHESSI. The advanced capabilities of EIS were used to measure Doppler shifts in 15 emission lines covering the temperature range T = 0.05-16MK during the impulsive phase of a C-class flare on 2007 December 14. Blueshifts indicative of the evaporated material were observed in six emission lines from Fe XIV-XXIV (2-16 MK). Upflow velocity was found to scale with temperature as v_up (km s-1) ≈ 5-17 T (MK). Although the hottest emission lines, Fe XXIII and Fe XXIV, exhibited upflows of >200 km s-1, their line profiles were found to be dominated by a stationary component in stark contrast to the predictions of the standard flare model. Emission from O VI-Fe XIII lines (0.5-1.5 MK) was found to be redshifted by v_down (km s-1) ≈ 60-17 T (MK) and was interpreted as the downward-moving ''plug'' characteristic of explosive evaporation. These downflows occur at temperatures significantly higher than previously expected. Both upflows and downflows were spatially and temporally correlated with HXR emission observed by RHESSI that provided the properties of the electron beam deemed to be the driver of the evaporation. The energy contained in the electron beam was found to be >1011 ergs/cm2/s consistent with the value required to drive explosive chromospheric evaporation from hydrodynamic simulations.

Authors: Ryan O. Milligan, Brian R. Dennis
Projects: Hinode/EIS,RHESSI

Publication Status: ApJ (accepted)
Last Modified: 2009-04-29 04:11
Go to main E-Print page  Propagating slow magnetoacoustic waves in coronal loops observed by Hinode/EIS  Velocity Characteristics of Evaporated Plasma Using Hinode/EIS  Edit Entry  Download Preprint  Delete Entry 

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