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The energetic ion signature of an O-type neutral line in the geomagnetic tailAn energetic ion signature is presented which has the potential for remote sensing of an O-type neutral line embedded in a current sheet. A source plasma with a tailward flowing Kappa distribution yields a strongly non-Kappa distribution after interacting with the neutral line: sharp jumps, or ridges, occur in the velocity space distribution function f(nu-perpendicular, nu-parallel) associated with both increases and decreases in f. The jumps occur when orbits are reversed in the x-direction: a reversal causing initially earthward particles (low probability in the source distribution) to be observed results in a decrease in f, while a reversal causing initially tailward particles to be observed produces an increase in f. The reversals, and hence the jumps, occur at approximately constant values of perpendicular velocity in both the positive nu parallel and negative nu parallel half planes. The results were obtained using single particle simulations in a fixed magnetic field model.
Document ID
Document Type
Reprint (Version printed in journal)
Martin, R. F., Jr. (Illinois State Univ. Normal, IL, United States)
Johnson, D. F. (Illinois State University Normal, United States)
Speiser, T. W. (Colorado, University; NOAA, Space Environment Laboratory, Boulder, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Advances in Space Research
Volume: 11
Issue: 9 19
ISSN: 0273-1177
Subject Category
Funding Number(s)
Distribution Limits