The Birth of A Coronal Mass Ejection
Abstract
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.
- Publication:
-
Science Advances
- Pub Date:
- March 2019
- DOI:
- 10.1126/sciadv.aau7004
- arXiv:
- arXiv:1811.04707
- Bibcode:
- 2019SciA....5.7004G
- Keywords:
-
- Coronal mass ejections;
- Solar flares;
- Magnetic reconnection;
- Current sheet;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Original version submitted to Science Advances