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Nonthermal Velocities in the Solar Transition Zone J.G. Doyle, E. O'Shea and R. Erd'elyi

Summary: Nonthermal Velocities in the Solar Transition Zone
and Corona
J.G. Doyle, E. O'Shea and R. Erd'elyi
Armagh Observatory, Armagh BT61 9DG, N. Ireland.
jgd@star.arm.ac.uk eos@star.arm.ac.uk rfs@star.arm.ac.uk
K.P. Dere and D.G. Socker
E. O. Hulburt Center for Space Research, U.S. Naval Research Laboratory,
Washington DC 20375­5000, USA.
F.P. Keenan
Department of Pure and Applied Physics, The Queen's University of Belfast,
Belfast BT7 1NN, N. Ireland.
(Received ..... ; Accepted in final form .....)
Abstract. Nonthermal velocities are presented for spectral lines covering the tem­
perature range 10 4 K -- 10 6 K, measured from high spectral resolution data for several
solar features observed at the limb by the High Resolution Telescope and Spectro­
graph (HRTS), including a coronal hole, `quiescent regions' and several small scale
active regions. These results are compared with predictions based on acoustic waves
and heating via Alfv'en waves. It is likely that more than one mechanism is operating


Source: Armagh Observatory


Collections: Physics