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JOINT HIGH TEMPERATURE OBSERVATION OF A SMALL C6.5 SOLAR FLARE WITH IRIS/EIS/AIA  

Vanessa Polito   Submitted: 2015-03-18 08:23

We present the observation of a C6.5 class flare on 2014 February 3, obtained with the Interface RegionImaging Spectrograph (IRIS) and the EUV Imaging Spectrometer (EIS) on board HINODE. We followthe details of the impulsive phase with IRIS and the gradual decay phase with both IRIS and EIS.The IRIS Slit-Jaw Imager and Atmospheric Imaging Assembly (AIA) are used to precisely co-alignthe two sets of spectroscopic observations. Of particular interest is the Fe XXI 1354.08 Å spectral line,which is the highest temperature emission (∼ 10 MK) observed in the IRIS wavelength range. Weshow the evolution of the Fe XXI profiles during the impulsive phase of the flare at the same ribbonlocation with a 75 s temporal cadence. Totally blue-shifted (∼ 82 km s-1) profiles are found at thevery early phase of the flare and gradually decrease in about 6 minutes. This result is consistent with1-D model predictions during chromospheric evaporation in flares. The blue shifted components alsoexhibit large non-thermal broadening, which decrease simultaneously with the blue-shifted velocity.After the evaporation first occurs, the Fe XXI intensity progressively moves from the footpoints to thetop of the hot flare loops seen in the AIA 131 Å images, where the emission is observed to be at restand thermal. Emission measure estimates from IRIS/EIS/AIA observations during the gradual phaseshow isothermal loop top structures cooling from about 13.5 MK to 12 MK with electron densities ofthe order ∼ 5 - 6 x 1010 cm-3 .

Authors: Polito V.,Reeves, K.K., Del Zanna, G., Golub, L., Mason, H.E.
Projects: IRIS

Publication Status: Manuscript Sent to Production
Last Modified: 2015-03-18 12:30
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JOINT HIGH TEMPERATURE OBSERVATION OF A SMALL C6.5 SOLAR FLARE WITH IRIS/EIS/AIA

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