Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...361..759z&link_type=abstract
Astronomy and Astrophysics, v.361, p.759-765 (2000)
Astronomy and Astrophysics
Astrophysics
22
Sun: Chromosphere, Sun: Magnetic Fields, Sun: X-Rays, Gamma Rays
Scientific paper
We described simultaneous observations of a surge in H&beta and an X-ray jet in NOAA 8100 on November 1, 1997. We found that the H&beta 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&beta filtergrams, and both blueshifts and redshifts in the H&beta 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&beta 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&beta surge.
Liu Ya-Ying
Wang Jeffrey
Zhang James J.
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