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Large-amplitude prominence oscillations following the impact by a coronal jet View all abstracts by submitter

Manuel Luna   Submitted: 2021-03-09 04:18

Observational evidence shows that coronal jets can hit prominences and set them in motion. The impact leads to large-amplitude oscillations (LAOs) of the prominence. In this paper we attempt to understand this process via 2.5D MHD numerical experiments. In our model, the jets are generated in a sheared magnetic arcade above a parasitic bipolar region located in one of the footpoints of the filament channel (FC) supporting the prominence. The shear is imposed with velocities not far above observed photospheric values; it leads to a multiple reconnection process, as in previous jet models. Both a fast Alfvénic perturbation and a slower supersonic front preceding a plasma jet are issued from the reconnection site; in the later phase, a more violent (eruptive) jet is produced. The perturbation and jets run along the FC; they are partially reflected at the prominence and partially transmitted through it. There results a pattern of counter-streaming flows along the FC and oscillations of the prominence. The oscillations are LAOs (with amplitude above 10 km s-1) in parts of the prominence both in the longitudinal and transverse directions. In some field lines, the impact is so strong that the prominence mass is brought out of the dip and down to the chromosphere along the FC. Two cases are studied with different heights of the arcade above the parasitic bipolar region, leading to different heights for the region of the prominence perturbed by the jets. The obtained oscillation amplitudes and periods are in general agreement with the observations.

Authors: Manuel Luna & Fernando Moreno-Insertis
Projects: None

Publication Status: Accepted for publication in The Astrophysical Jornal
Last Modified: 2021-03-09 15:33
Go to main E-Print page  The Evolution of Plasma Composition During a Solar Flare  Mass of prominences experiencing failed eruptions  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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