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Genesis and Coronal-jet-generating Eruption of a Solar Minifilament Captured by IRIS Slit-raster Spectra View all abstracts by submitter

Navdeep Panesar   Submitted: 2022-09-07 13:25

We present the first IRIS MgII slit-raster spectra that fully capture the genesis and coronal-jet-generating eruption of a central-disk solar minifilament. The minifilament arose in a negative-magnetic-polarity coronal hole. The MgII spectroheliograms verify that the minifilament plasma temperature is chromospheric. The MgII spectra show that the erupting minifilamentís plasma has blueshifted upflow in the jet spireís onset and simultaneous redshifted downflow at the location of the compact jet bright point (JBP). From the MgII spectra together with AIA EUV images and HMI magnetograms, we find: (i) the minifilament forms above a flux-cancelation neutral line at an edge of a negative-polarity network flux clump; (ii) during the minifilamentís fast-eruption onset and jet-spire onset, the JBP begins brightening over the flux-cancelation neutral line. From IRIS{^2} inversion of the MgII spectra, the JBPís MgII bright plasma has electron density, temperature, and downward (red-shift) Doppler speed of 1012 cm-3, 6000 K, and 10 \kms, respectively, and the growing spire shows clockwise spin. We speculate: (i) during the slow rise of the erupting minifilament-carrying twisted flux rope, the top of the erupting flux-rope loop, by writhing, makes its field direction opposite that of encountered ambient far-reaching field; (ii) the erupting kink then can reconnect with the far-reaching field to make the spire and reconnect internally to make the JBP. We conclude that this coronal jet is normal in that magnetic flux cancelation builds a minifilament-carrying twisted flux rope and triggers the JBP-generating and jet-spire-generating eruption of the flux rope.

Authors: Navdeep K. Panesar, Sanjiv K. Tiwari, Ronald L. Moore, Alphonse C. Sterling, and Bart De Pontieu
Projects: IRIS,SDO-AIA,SDO-HMI

Publication Status: Accepted for publication in ApJ
Last Modified: 2022-09-11 17:48
Go to main E-Print page  Two-spacecraft detection of short-period decayless kink oscillations of solar coronal loops  First detection of transverse vertical oscillation during the expansion of coronal loops  Edit Entry  Download Preprint  Delete Entry 

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