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Bidirectional Proton Flows and Comparison of Freezing-in Temperatures in ICMEs and Magnetic Clouds

Published online by Cambridge University Press:  03 June 2005

L. Rodriguez ,
J. Woch ,
N. Krupp ,
M. Fränz ,
R. von Steiger ,
C. Cid ,
R. Forsyth  and
K.-H. Glaßmeier
L. Rodriguez
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, D 37191, Germany email: [email protected]
J. Woch
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, D 37191, Germany email: [email protected]
N. Krupp
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, D 37191, Germany email: [email protected]
M. Fränz
Affiliation:
Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, D 37191, Germany email: [email protected]
R. von Steiger
Affiliation:
International Space Science Institute, CH-3012 Bern, Switzerland
C. Cid
Affiliation:
Departamento de Física, Universidad de Alcalá, 28871 Alcalá de Henares, Madrid, Spain
R. Forsyth
Affiliation:
The Blackett Laboratory, Imperial College, London SW7 2BW, UK
K.-H. Glaßmeier
Affiliation:
Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, D-38106 Braunschweig, Germany
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Abstract

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From all the transient events identified in interplanetary space by in-situ measurements, Magnetic Clouds (MCs) are among the most intriguing ones. They are a special kind of Interplanetary Coronal Mass Ejections (ICMEs), characterized by a well-defined magnetic field configuration. We use a list of 40 MCs detected by Ulysses to study bidirectional flows of protons in the $\sim$0.5 MeV energy range. Solar wind ions are also analysed in order to compare cloud to non-cloud ICMEs.

The enhancement in freezing-in temperatures inside the clouds, obtained with data from the SWICS instrument, provides insights into processes occurring early during the ejection of the material and represents a complementary tool to differentiate cloud from non-cloud ICMEs. At higher energies, directional information for protons obtained with the EPAC instrument allows a comparison with previous results concerning bidirectional suprathermal electrons. The findings are qualitatively comparable. Apparently, the portion of bidirectional flows inside magnetic clouds is neither heavily dependent on distance from the Sun nor on parameters obtained from a flux rope model.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Sun: coronaSun: abundancesSun: coronal mass ejections (CMEs)Sun: solar windSun: particle emission
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS226 , September 2004 , pp. 420 - 427
Copyright
© 2005 International Astronomical Union