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Issue A&A Volume 432, Number 1, March II 2005 Page(s) L1 - L4 Section Letters DOI 10.1051/0004-6361:200500029

A&A 432, L1-L4 (2005)
DOI: 10.1051/0004-6361:200500029

Letter

Links between magnetic fields and plasma flows in a coronal hole

T. Wiegelmann¹, L. D. Xia² and E. Marsch<sup>1

1</sup>  Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Strasse 2, 37191 Katlenburg-Lindau, Germany
    e-mail: wiegelmann@linmpi.mpg.de
²  School of Earth and Space Sciences, Univ. of Science and Technology of China, Hefei 23006, PR China

(Received 15 October 2004 / Accepted 20 January 2005 )

Abstract
We compare the small-scale features visible in the Ne VIII Doppler-shift map of an equatorial coronal hole (CH) as observed by SUMER with the small-scale structures of the magnetic field as constructed from a simultaneous photospheric magnetogram by a potential magnetic-field extrapolation. The combined data set is analysed with respect to the small-scale flows of coronal matter, which means that the Ne VIII Doppler-shift used as tracer of the plasma flow is investigated in close connection with the ambient magnetic field. Some small closed-field regions in this largely open CH are also found in the coronal volume considered. The Doppler-shift patterns are found to be clearly linked with the field topology.

Key words: Sun: corona -- Sun: magnetic field -- Sun: UV radiation -- Sun: Doppler shifts

© ESO 2005

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