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Probing Current Sheet Instabilities from Flare Ribbon Dynamics View all abstracts by submitter

Ryan French   Submitted: 2021-09-13 09:10

The presence of current sheet instabilities, such as the tearing mode instability, are needed to account for the observed rate of energy release in solar flares. Insights into these current sheet dynamics can be revealed by the behaviour of flare ribbon substructure, as magnetic reconnection accelerates particles down newly reconnected field lines into the chromosphere to mark the flare footpoints. Behaviour in the ribbons can therefore be used to probe processes occurring in the current sheet. In this study, we use high-cadence (1.7 s) IRIS Slit Jaw Imager observations to probe for the growth and evolution of key spatial scales along the flare ribbons - resulting from dynamics across the current sheet of a small solar flare on December 6th 2016. Combining analysis of spatial scale growth with Si IV non-thermal velocities, we piece together a timeline of flare onset for this confined event, and provide evidence of the tearing-mode instability triggering a cascade and inverse cascade towards a power spectrum consistent with plasma turbulence.

Authors: Ryan J. French, Sarah A. Matthews, I. Jonathan Rae, Andrew W. Smith
Projects: IRIS

Publication Status: Accepted for publication to ApJ
Last Modified: 2021-09-13 20:56
Go to main E-Print page  Measurements of Photospheric and Chromospheric Magnetic Field Structures Associated with Chromospheric Heating over a Solar Plage Region  Global Nature of Solar Coronal Shock Waves shown by Inconsistency between EUV Waves and Type II Radio Bursts  Edit Entry  Download Preprint  Delete Entry 

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