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Neutral line chaos and phase space structurePhase space structure and chaos near a neutral line are studied with numerical surface-of-section (SOS) techniques and analytic methods. Results are presented for a linear neutral line model with zero crosstail electric field. It was found that particle motion can be divided into three regimes dependening on the value of the conserved canonical momentum, Py, and the conserved Hamiltonian, h. The phase space structure, using Poincare SOS plots, is highly sensitive to bn = Bn/B0 variations, but not to h variations. It is verified that the slow motion preserves the action, Jz, as evaluated by Sonnerup (1971), when the period of the fast motion is smaller than the time scale of the slow motion. Results show that the phase space structure and particle chaos depend sensitively upon Py and bn, but are independent of h.
Document ID
19910063744
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Burkhart, Grant R.
(Colorado Univ. Boulder, CO, United States)
Speiser, Theodore W.
(Colorado, University; NOAA, Space Environment Laboratory, Boulder, United States)
Martin, Richard F., Jr.
(Illinois State University Normal, United States)
Dusenbery, Paul B.
(Colorado, University; NOAA, Space Environment Laboratory, Boulder; NSF, Washington, DC, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Geophysical Research Letters
Volume: 18
ISSN: 0094-8276
Subject Category
Plasma Physics
Accession Number
91A48367
Funding Number(s)
CONTRACT_GRANT: NAGW-1176
CONTRACT_GRANT: NSF ATM-90-02447
Distribution Limits
Public
Copyright
Other

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