An H surge and X-ray jet - Magnetic properties and velocity patterns
J. Zhang 1,2,
J. Wang 1,2 and
Y. Liu 1
Received 12 May 2000 / Accepted 19 July 2000
We described simultaneous observations of a surge in H and an X-ray jet in NOAA 8100 on November 1, 1997. We found that the H surge was spatially coincident with the X-ray jet. They occurred at the site where the pre-existing magnetic flux was "cancelled" by a newly emerging flux of opposite polarity. At the base of the surge we identified surge-flaring in the H filtergrams, and both blueshifts and redshifts in the H Dopplergrams. The X-ray jet appeared about 2 hours after the first appearance of the surge. The surge consisted of two ejecting threads. Initially, these two components were twisted together, then became untwisted before the appearance of the X-ray jet. This example presents an alternative scenario of plasma ejection. The magnetic reconnection in the lower atmosphere, which was responsible for the H surge, created the twisted surge threads; the X-ray jet likely resulted from a fast reconnection in the upper atmosphere, which took place well after the H surge.
Key words: Sun: chromosphere Sun: magnetic fields Sun: X-rays, gamma rays
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© European Southern Observatory (ESO) 2000
Online publication: October 2, 2000