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Velocity Characteristics Of Evaporated Plasma Using Hinode /euv Imaging Spectrometer by Milligan, Ryan O.; Dennis, Brian R. is a Physics and Astronomy article available to read on EtoBox.

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This paper presents a detailed study of chromospheric evaporation using the EUV Imaging Spectrometer (EIS) onboard Hinode in conjunction with hard X-ray (HXR) observations from Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI). The advanced capabilities of EIS were used to measure Doppler shifts in 15 emission lines covering the temperature range T = 0.05-16 MK 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 (v up ) was found to scale with temperature as v up (km s -1 ) ≈ 8-18T (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 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 ) ≈ 60-17T (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 spatia

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Author

Milligan, Ryan O.; Dennis, Brian R.

Publisher

University of Chicago Press; American Astronomical Society; Institute of Physics Publishing; IOP Publishing; Oxford University Press (OUP) (ISSN 0004-637X)

Published

2009

Language

EN

Field

Physics and Astronomy (Physical Sciences)