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Self-similar evolution of interplanetary magnetic clouds and Ulysses measurements of the polytropic index inside the cloudA self similar model for the expanding flux rope is developed for a magnetohydrodynamic model of interplanetary magnetic clouds. It is suggested that the dependence of the maximum magnetic field on the distance from the sun and the polytropic index gamma has the form B = r exp (-1/gamma), and that the ratio of the electron temperature to the proton temperature increases with distance from the sun. It is deduced that ion acoustic waves should be observed in the cloud. Both predictions were confirmed by Ulysses observations of a 1993 magnetic cloud. Measurements of gamma inside the cloud demonstrate sensitivity to the internal topology of the magnetic field in the cloud.
Document ID
19990056482
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Osherovich, Vladimir A.
(Hughes STX, Inc. Greenbelt, MD United States)
Fainberg, J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Stone, R. G.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
MacDowall, R. J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Berdichevsky, D.
(Hughes STX, Inc. Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
December 1, 1997
Publication Information
Publication: Proceedings of the 31st ESALB Symposium on Correlated Phenomena at the Sun, in the Heliosphere and in Geospace
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Other
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