Observational Evidences of Electron-driven Evaporation in two Solar Flares

Abstract

We have explored the relationship between hard X-ray (HXR) emissions and Doppler velocities caused by the chromospheric evaporation in two X1.6 class solar flares on 2014 September 10 and October 22, respectively. Both events display double ribbons and Interface Region Imaging Spectrograph (IRIS) slit is fixed on one of their ribbons from the flare onset. The explosive evaporations are detected in these two flares. The coronal line of Fe XXI 1354.09 A shows blue shifts, but chromospheric line of C I 1354.29 A shows red shifts during the impulsive phase. The chromospheric evaporation tends to appear at the front of flare ribbon. Both Fe XXI and C I display their Doppler velocities with a `increase-peak-decrease' pattern which is well related to the `rising-maximum- decay' phase of HXR emissions. Such anti-correlation between HXR emissions and Fe XXI Doppler shifts, and correlation with C I Doppler shifts indicate the electron-driven evaporation in these two flares.

35 pages, 9 figures, 1 table, accepted for publication in the Astrophysical Journal

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Cited by in corpus (34)

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• Efficient Calculation of Non-Local Thermodynamic Equilibrium Effects in Multithreaded Hydrodynamic Simulations of Solar Flares
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• Relationship between chromospheric evaporation and magnetic field topology in M-class solar flare
• Observations of Electron-driven Evaporation during a Flare Precursor
• Statistical Study of Chromospheric Evaporation in Impulsive Phase of Solar Flares
• Imaging observations of chromospheric evaporation in a circular-ribbon flare
• Simultaneous Observations of Chromospheric Evaporation and Condensation during a C-class Flare
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• Spectroscopic Diagnostics of Solar Magnetic Flux Ropes Using Iron Forbidden Line
• Energy Deposition by Energetic Electrons in a Diffusive Collisional Transport Model
• Call and Response: A Time-Resolved Study of Chromospheric Evaporation in a Large Solar Flare
• The Transition Region of Solar Flare Loops
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