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A&A 469, 331-337 (2007)
DOI: 10.1051/0004-6361:20053954
The H
surges and EUV jets from magnetic flux emergences and cancellations
Y. C. Jiang, H. D. Chen, K. J. Li, Y. D. Shen, and L. H. Yang National Astronomical Observatories/Yunnan Observatory, CAS, Kunming 650011, PR China
e-mail: jyc@ynao.ac.cn
(Received 1 August 2005 / Accepted 1 February 2007)
Abstract
We analyzed multi-wavelength observations of three surges with
a recurrent period of about 70 min
in H, EUV, and soft X-ray, which occurred in the quiet-sun region
on 2000 November 3. These homologous surges were associated with small
flares at the same base, but their exact footpoints were spatially
separated from the flare. Each surge consisted of a
cool H component and a hot, EUV or soft X-ray component,
which showed different evolutions not only in space but also in time.
The EUV jets had slightly converging shapes, underwent more complicate development,
showed clearly twisting structures, and appeared to open to space.
The H surges, however, were smaller and only traced
the edges of the jets. They always occurred later than
the jets but had dark EUV counterparts appearing in the bright jets.
These surge activities were closely associated with two
emerging bipoles and their driven flux cancellations at the base region,
and were consistent with the magnetic reconnection surge model.
The possible cause of the delay between the surges and jets, of the
dark structures in the jets are discussed,
along with the possible role of flux cancellations in generation
of these surges.
Key words: Sun: activity -- Sun: magnetic field
© ESO 2007