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Observations from the Hinode/XRT telescope and STEREO/SECCHI/EUVI areutilized to study polar coronal jets and plumes. The study focuses on thetemporal evolution of both structures and their relationship. The data sample,spanning April 7-8 2007, shows that over 90% of the 28 observed jet events areassociated with polar plumes. EUV images (STEREO/SECCHI) show plume haze risingfrom the location of approximately 70% of the polar X-ray (Hinode/XRT) and EUVjets, with the plume haze appearing minutes to hours after the jet wasobserved. The remaining jets occurred in areas where plume material previouslyexisted causing a brightness enhancement of the latter after the jet event.Short-lived, jet-like events and small transient bright points are seen (one ata time) at different locations within the base of pre-existing long-livedplumes. X-ray images also show instances (at least two events) ofcollimated-thin jets rapidly evolving into significantly wider plume-likestructures that are followed by the delayed appearance of plume haze in theEUV. These observations provide evidence that X-ray jets are precursors ofpolar plumes, and in some cases cause brightenings of plumes. Possiblemechanisms to explain the observed jet and plume relationship are discussed.

Evidence for polar jets as precursors of polar plume formation