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Outflow Velocities in Polar Coronal Holes

Published online by Cambridge University Press:  26 May 2016

A. H. Gabriel ,
F. Bely-Dubau ,
P. Lemaire  and
E. Antonucci
A. H. Gabriel
Affiliation:
1Institut d'Astrophysique Spatiale, 91405 Orsay Cedex, France
F. Bely-Dubau
Affiliation:
2Observatoire de la CÔte d'Azur, BP4229, 06304 Nice Cedex, France
P. Lemaire
Affiliation:
1Institut d'Astrophysique Spatiale, 91405 Orsay Cedex, France
E. Antonucci
Affiliation:
3Observatorio Astronomico di Torino, I-10025 Pino Torinese, Italy

Abstract

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Observations have been carried out using the oxygen VI multiplet ratio 1032/1038 Â from SUMER on SOHO. Analysis based on the Doppler dimming method shows that the outflow velocity in polar plumes is higher than that in the interplume region, contrary to many published suggestions. The addition of UVCS data for the interplume region, leads to a conclusion that the effective oxygen ion “temperature” in the radial direction has to rise to around 14 MK over the height range 1.5 to 1.8 R⊙.

Type
Part 11: Open Magnetic Structures and Winds
Information
Symposium - International Astronomical Union , Volume 219: Stars as Suns : Activity, Evolution and Planets , 2004 , pp. 635 - 640
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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