Kamio, S., Hara, H., Watanabe, T., and Curdt, W., "Distribution of
jets and magnetic fields in a coronal hole,"
A&A 502, 345 (2009).
Click on the image above for a larger .gif version.
X-ray jets, originally discovered by Yohkoh, are most visible in the polar coronal holes. These are flare-like actions, although it is well known that powerful flares typically happen without much jet action. The surprising thing about these coronal-hole jets is the presence of kilogauss field accumulations, best observed via Hinode due to its privileged location in space. This cartoon suggests a common explanation for these coronal jets and cool jets. Where do the kG fields come from? Is it flux emergence, or is it accumulation of flux from a broader area? What is the Poynting flux doing? What is the role of magnetic reconnection? There are lots of questions about these remarkable phenomena.
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