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Line Broadening of EUV lines Across the Solar limb: A Spicule Contribution?

Summary: Line Broadening of EUV lines Across the Solar limb: A Spicule
J. G. Doyle1, J. Giannikakis1,2, L. D. Xia1,3 and M.S. Madjarska4,5
Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland
Sect. of Astrophysics, Astronomy and Mechanics, Dept. of Physics, Univ. of Athens, Athens 15783, Greece
School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
Max-Planck-Institut fur Sonnensystemforschung , Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Department of Solar Physics, Royal Observatory of Belgium, Av. Circulaire 3, B-1180 Bruxelles, Belgium
Received date, accepted date
Abstract. Spectral lines formed in the solar transition region show an increase in the line width, peaking at 10,000 km above
the limb. Looking at a region off-limb with no obvious spicules, the non-spicule region has a significantly smaller line width
above 6,000 km compared those taken in a spicule region. We suggest that this increase in line broadening is not due to small
scale random motions but rather to unresolved line shifts due to spicules and/or macro-spicules activity.
Key words. Sun: atmosphere transition region off-limb line broadening spicules
1. Introduction


Source: Armagh Observatory


Collections: Physics