Homologous Jet-Driven Coronal Mass Ejections From Solar Active Region 12192

TL;DR

This study documents homologous jets from a solar active region that produced associated CMEs, revealing their characteristics, origins, and the magnetic reconnection processes involved, enhancing understanding of jet-driven CME mechanisms.

Contribution

It provides detailed observations of homologous jets and their CMEs, highlighting their properties, origins, and the magnetic reconnection processes, which differ from previous models of streamer-puff CMEs.

Findings

Jets and CMEs originated from magnetic reconnection at the jet base.

CME-producing jets were faster, longer-lasting, and more energetic.

Jet-driven CMEs were slower and inflated preexisting streamers without destroying them.

Abstract

We report observations of homologous coronal jets and their coronal mass ejections (CMEs) observed by instruments onboard the Solar Dynamics Observatory (SDO) and Solar and Heliospheric Observatory (SOHO) spacecraft. The homologous jets originated from a location with emerging and canceling magnetic field at the southeast edge of the giant active region (AR) of 2014 October, NOAA 12192. This AR produced in its interior many non-jet major flare eruptions (X and M class) that made no CME. During 20-27 October, in contrast to the major-flare eruptions in the interior, six of the homologous jets from the edge resulted in CMEs. Each jet-driven CME( ~200-300 kms) was slower-moving than most CMEs; had angular width (20-50 degree) comparable to that of the base of a coronal streamer straddling the AR; and was of the `streamer-puff' variety, whereby the preexisting streamer was transiently inflated but not destroyed by the passage of the CME. Much of the transition-region-temperature plasma in the CME-producing jets escaped from the Sun, whereas relatively more of the transition-region plasma in non-CME-producing jets fell back to the solar surface. Also, the CME-producing jets tended to be faster and longer-lasting than the non-CME-producing jets. Our observations imply: each jet and CME resulted from reconnection opening of twisted field that erupted from the jet base; and the erupting field did not become a plasmoid as previously envisioned for streamer-puff CMEs, but instead the jet-guiding streamer-base loop was blown out by the loop's twist from the reconnection.