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Polar Plumes and Interplume regions as observed by SUMER on SOHO

Summary: Polar Plumes and Inter­plume regions as observed by
D. Banerjee, L. Teriaca & J.G. Doyle
Armagh Observatory, Armagh BT61 9DG, N. Ireland.
dipu@star.arm.ac.uk, lte@star.arm.ac.uk, jgd@star.arm.ac.uk
P. Lemaire
Insitut d'Astrophysique Spatiale, Unite Mixte CNRS, Universite Paris XI, Bat
121, F­91405, Orsay, France
(Received ..... ; Accepted in final form .....)
Abstract. We present observations of O vi 1032 š A line profiles obtained with the
SUMER instrument on SOHO extending from the solar disk to 1.5 R fi above the
limb in the north polar coronal hole. Variations of the intensity and line width in the
polar plume and inter­plume regions are investigated. We find an anti­correlation
between the intensity and the line width in the plume and inter­plume regions with
detailed plume structures been seen out to 1.5 R fi . Possible implications regarding
the magnetic topologies of these two regions and related heating mechanisms are
discussed. The O vi line width measurements are combined with UVCS output to
provide an overview of its variations with height extending up to 3.5 R fi . We find
a linear increase of the line width from 1 to 1.2 R fi , then a plateau followed by a
sharp increase around 1.5 R fi .


Source: Armagh Observatory


Collections: Physics