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This study analyzes near-infrared measurements of Io, Jupiter's moon,observed over 170 nights from 2016 to early 2022 using the NASA InfraredTelescope Facility (IRTF). During this period, seven new volcanic outbursts,the most energetic volcanic events on Io, were discovered and characterized,increasing the total number of observed outburst events from 18 to 25. We alsopresent simplified criteria for the thermal detection of an outburst, requiringit to be both confined to a specific location of Io and above a thresholdintensity in the Lp-band (3.8 micron).  Our measurements use 2 to 5 micron photometry in eclipse, Jupiteroccultation, and reflected sunlight. In addition to extending the observationaldataset of Io's dynamic activity, these data provide insights into the temporaland spatial distribution of outbursts on Io. Notably, all seven outbursts weredetected in Io's trailing hemisphere. These include Pillan Patera and a newlydiscovered repeating outburst location at Acala Fluctus. We add these events tothe rare category of recurring outbursts, before which Tvashtar was the onlyknown example. We observed that another outburst at UP 254W decreased inLp-band intensity by a factor of two in 4.5 hours. In August 2021, Io exhibitedhigh volcanic activity when two powerful outbursts rapidly appeared,propagating East. Our findings underscore IRTF's ongoing contributions to thestudy of Io.

Discovery of seven volcanic outbursts on Io from an IRTF observation campaign 2016 to 2022