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Correlation between proton anisotropy and magnetic field direction in the distant geotailA statistical analysis has been conducted of the anisotropy of suprathermal protons and the polarity of the magnetic field during April 10-16, 1983. At this time, ISEE-3 was at lunar distances in the geomagnetic tail of the earth, and well within the nominal magnetopause. The first-order anisotropy is presently correlated with the latitude angle and the z-component of the magnetic field. The anisotropy direction's frequency distribution is strongly peaked in the earthward and tailward direction, indicating fast earthward and tailward flows. For large anisotropies, and within 5 earth radii of the nominal neutral sheet position, a strong correlation is found between the earthward-streaming suprathermal protons and the northward polarity of the magnetic field; large tailward anisotropies are generally correlated with southward magnetic field polarity. This correlation is most simply interpreted in terms of a neutral line or reconnection model.
Document ID
19850029364
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Klecker, B.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Scholer, M.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Hovestadt, D.
(Max-Planck-Institut fuer Physik und Astrophysik Garching, Germany)
Gloeckler, G.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Ipavich, F. M.
(Maryland, University College Park, MD, United States)
Smith, E. J.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Tsurutani, B. T.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Publication Information
Publication: Geophysical Research Letters
Volume: 11
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
85A11515
Funding Number(s)
CONTRACT_GRANT: NAS5-26739
CONTRACT_GRANT: NAGW-101
CONTRACT_GRANT: BMFT-RV15-B8/74
CONTRACT_GRANT: NGR-21-002-316
Distribution Limits
Public
Copyright
Other

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