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The magnetic field of the equatorial magnetotail - AMPTE/CCE observations at R less than 8.8 earth radiiThe MPTE/CCE magnetic field experiment has been used to obtain a quantitative evaluation of the frequency and extent of magnetic field distortion in the near-tail region at less than 8.8 earth radii. The variation of this distortion with Kp, radial distance, longitude, and near-equatorial latitude is reported. It has been found that taillike distortions from the dipole field direction may reach 80 deg near the MPTE/CE apogee of 8.8 earth radii. The Bz field component in dipole coordinates was always positive within 0.5 earth radii of the equatorial current sheet, indicating the neutral lines were never seen inside of 8.8 earth radii. Fields were most taillike near midnight and during times of high Kp. At 8.5 earth radii the equatorial field magnitude depressions were roughly half the dipole field strength of 51 nT. These depressions are larger at lesser distances, reaching -40 nT at 3.4 earth radii for Kp of 2- or less and -80 nT and Kp of 3+ and greater.
Document ID
Document Type
Reprint (Version printed in journal)
Fairfield, D. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Acuna, M. H. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zanetti, L. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Potemra, T. A. (Johns Hopkins University Laurel, MD, United States)
Date Acquired
August 13, 2013
Publication Date
July 1, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Distribution Limits