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Observations from the X-ray telescope (XRT) on Hinode are used to study thenature of X-ray bright points, sources of coronal jets. Several jet events inthe coronal holes are found to erupt from small-scale, S-shaped bright regions.This finding suggests that coronal micro-sigmoids may well be progenitors ofcoronal jets. Moreover, the presence of these structures may explain numerousobserved characteristics of jets such as helical structures, apparenttransverse motions, and shapes. In analogy to large-scale sigmoids giving riseto coronal mass ejections (CMEs), a promising future task would perhaps be toinvestigate whether solar eruptive activity, from coronal jets to CMEs, isself-similar in terms of properties and instability mechanisms.

Micro-Sigmoids as Progenitors of Coronal Jets - Is Eruptive Activity Self-Similarly Multi-Scaled?