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The birth of a coronal mass ejection View all abstracts by submitter

Tingyu Gou   Submitted: 2019-06-30 19:54

The Sun's atmosphere is frequently disrupted by coronal mass ejections (CMEs), coupled with flares and energetic particles. The coupling is usually attributed to magnetic reconnection at a vertical current sheet connecting the flare and CME, with the latter embedding a helical magnetic structure known as flux rope. However, both the origin of flux ropes and their nascent paths toward eruption remain elusive. Here, we present an observation of how a stellar-sized CME bubble evolves continuously from plasmoids, mini flux ropes that are barely resolved, within half an hour. The eruption initiates when plasmoids springing from a vertical current sheet merge into a leading plasmoid, which rises at increasing speeds and expands impulsively into the CME bubble, producing hard x-ray bursts simultaneously. This observation illuminates a complete CME evolutionary path capable of accommodating a wide variety of plasma phenomena by bridging the gap between microscale and macroscale dynamics.

Authors: Tingyu Gou, Rui Liu, Bernhard Kliem, Yuming Wang, Astrid M. Veronig
Projects: Fermi/GBM,RHESSI,SDO-AIA,STEREO

Publication Status: Published in Science Advances, 2019, 5 : eaau7004
Last Modified: 2019-07-03 13:06
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