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Helical Magnetic Structure of White Light Polar Plumes

Published online by Cambridge University Press:  13 May 2016

A. N. Zhukov ,
I. S. Veselovsky ,
S. Koutchmy  and
A. Llebaria
A. N. Zhukov
Affiliation:
Institute of Nuclear Physics, Moscow State University, Moscow, 119899 Russia
I. S. Veselovsky
Affiliation:
Institute of Nuclear Physics, Moscow State University, Moscow, 119899 Russia
S. Koutchmy
Affiliation:
Institut d'Astrophysique de Paris - CNRS, 98 bis bd Arago, 75014 Paris, France
A. Llebaria
Affiliation:
Laboratoire d'Astronomie Spatiale - CNRS, Allée Peyresc, Marseille Cedex 12, France

Abstract

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We describe the fine structure of white light polar plumes observed using SOHO/LASCO C2 coronagraph. The evolving helical structures of different scales are clearly seen on processed images (the processing is made to reveal the faint contrast objects). The observed structures trace the magnetic field lines, so the electric currents flow along the axes of plumes. An MHD model of a plume which takes into account field-aligned electric currents is developed. The model permits to understand the existence of high-density plasma inside the plume due to the balance between the magnetic forces and the transverse pressure gradient.

Type
Session IV: Structure and Dynamics of the Transiton Region and Corona
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 434 - 436
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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