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We analyzed simultaneous EUV data from the Transition Region and Coronal Explorer and Ha data from Big Bear Solar Observatory. In the active region studied, we found several EUV jets that repeatedly occurred where pre-existing magnetic flux was "canceled" by newly emerging flux of opposite polarity. The jets look like Yohkoh soft X-ray jets, but are smaller and shorter lived than X-ray jets. They have a typical size of 4000-10,000 km, a transverse velocity of 50-100 km s Ϫ1 , and a lifetime ofdoi:10.1086/311910 fatcat:owynjzug35ghzpzvabzbet6ege