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Astron. Astrophys. 361, 759-765 (2000)

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An H[FORMULA] surge and X-ray jet - Magnetic properties and velocity patterns

J. Zhang 1,2, J. Wang 1,2 and Y. Liu 1

1 Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, P.R. China (zjun@ourstar.bao.ac.cn; wjx@ourstar.bao.ac.cn)
2 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P.R. China

Received 12 May 2000 / Accepted 19 July 2000

Abstract

We described simultaneous observations of a surge in H[FORMULA] and an X-ray jet in NOAA 8100 on November 1, 1997. We found that the H[FORMULA] 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[FORMULA] filtergrams, and both blueshifts and redshifts in the H[FORMULA] 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[FORMULA] 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[FORMULA] surge.

Key words: Sun: chromosphere – Sun: magnetic fields – Sun: X-rays, gamma rays

Send offprint requests to: J. Zhang

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© European Southern Observatory (ESO) 2000

Online publication: January 29, 2001
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