Credit: HINODE/P. Grigis
Hinodes x-ray instrument observed a coronal hole located around the south pole of the Sun. There, the magnetic configuration is strikingly different than the usual complex structure seen in coronal active regions: instead of an entangled jumble of loops, most of the magnetic field lines are nicely ordered, shooting straightly away from the Sun. These are called open field lines (though at some point they will bend and come back to the Sun). In the image, the jet is seen as a very thin and straight pencil beam.
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