The Trigger Mechanism of Recurrent Solar Active Region Jets Revealed by the Magnetic Properties of a Coronal Geyser Site. (arXiv:2002.11819v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Paraschiv_A/0/1/0/all/0/1">Alin Razvan Paraschiv</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Donea_A/0/1/0/all/0/1">Alina Donea</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Leka_K/0/1/0/all/0/1">K.D. Leka</a>

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.

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.

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