The Trigger Mechanism of Recurrent Solar Active Region Jets Revealed by the Magnetic Properties of a Coronal Geyser Site

Abstract

Solar active region jets are small-scale collimated plasma eruptions that are triggered from magnetic sites embedded in sunspot penumbral regions. Multiple trigger mechanisms for recurrent jets are under debate. Vector magnetic field data from SDO-HMI observations are used to analyze a prolific photospheric configuration, identified in extreme ultraviolet observations as a `Coronal Geyser', that triggered a set of at least 10 recurrent solar active region jets. We focus on interpreting the magnetic fields of small-scale flaring sites aiming to understand the processes that govern recurrent jet eruptions. We perform a custom reprocessing of the SDO-HMI products, including disambiguation and uncertainty estimation. We scrutinized the configuration and dynamics of the photospheric magnetic structures. The magnetic configuration is described via the analysis of the photospheric magnetic vertical fields, to identify the process is responsible for driving the jet eruptions. We report that the two widely debated magnetic trigger processes, namely magnetic flux cancellation and magnetic flux emergence, appear to be responsible on a case by case basis for generating each eruption in our set. We find that 4 of 10 jets were due to flux cancellation while the rest were clearly not, and were more likely due to flux emergence.

19 pages, 6 figure, and 1 table. The Astrophysical journal, In press

References in corpus (16)

• The Solar Optical Telescope for the Hinode Mission: An Overview
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: SHARPs -- Space-weather HMI Active Region Patches
• The Helioseismic and Magnetic Imager (HMI) Vector Magnetic Field Pipeline: Overview and Performance
• Solar Coronal Jets: Observations, Theory, and Modeling
• Small-scale filament eruptions as the driver of solar coronal hole X-ray jets
• Jets in coronal holes: Hinode observations and 3D computer modelling
• A Breakout Model for Solar Coronal Jets with Filaments
• Homologous Helical Jets: Observations by IRIS, SDO and Hinode and Magnetic Modeling with Data-Driven Simulations
• Recurrent solar jets in active regions
• A model for straight and helical solar jets: II. Parametric study of the plasma beta
• Sunspot Waves and Triggering of Homologous Active Region Jets
• Helical Blowout Jets in the Sun: Untwisting and Propagation of Waves
• A new method to quantify and reduce projection error in whole-solar-active-region parameters measured from vector magnetograms
• On Solar Recurrent Coronal Jets: Coronal Geysers as Sources of Electron Beams and Interplanetary Type-III Radio Bursts
• Observational Study on the Fine Structure and Dynamics of a Solar Jet. II. Energy Release Process Revealed by Spectral Analysis
• Observational Study on the Fine Structure and Dynamics of a Solar Jet. I. Energy Build-Up Process around a Satellite Spot

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• Decayless longitudinal oscillations of a solar filament maintained by quasi-periodic jets
• Thermal and Non-Thermal Properties of Active Region Recurrent Coronal Jets
• Observational Study of Recurrent Jets: Evolution of Magnetic Flux, Current, and Helicity