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Solar active region jets are small-scale collimated plasma eruptions that aretriggered from magnetic sites embedded in sunspot penumbral regions. Multipletrigger mechanisms for recurrent jets are under debate. Vector magnetic fielddata from SDO-HMI observations are used to analyze a prolific photosphericconfiguration, identified in extreme ultraviolet observations as a `CoronalGeyser', that triggered a set of at least 10 recurrent solar active regionjets. We focus on interpreting the magnetic fields of small-scale flaring sitesaiming to understand the processes that govern recurrent jet eruptions. Weperform a custom reprocessing of the SDO-HMI products, including disambiguationand uncertainty estimation. We scrutinized the configuration and dynamics ofthe photospheric magnetic structures. The magnetic configuration is describedvia the analysis of the photospheric magnetic vertical fields, to identify theprocess is responsible for driving the jet eruptions. We report that the twowidely debated magnetic trigger processes, namely magnetic flux cancellationand magnetic flux emergence, appear to be responsible on a case by case basisfor generating each eruption in our set. We find that 4 of 10 jets were due toflux cancellation while the rest were clearly not, and were more likely due toflux emergence.

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