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Harmonically structured ULF pulsations observed by the AMPTE CCE magnetic field experimentSpectrograms of ULF waves in the 0 to 80 mHz frequency range have been prepared from magnetic field data obtained by the elliptically orbiting AMPTE/CCE satellite (with an apogee of approximately 8.8 earth radii). The most prominent feature of these spectrograms (which cover a full 15.6-h orbit) is the presence of harmonically structured, azimuthally polarized pulsations in the outer magnetosphere during daytime hours. The frequencies of these pulsations decrease with increasing radial distance from the earth, indicating that they represent independent resonances of local magnetic flux tubes. The latitudinal structure of these harmonic pulsations, observed as AMPTE/CCE traveled to + or - 16 deg magnetic latitude, is consistent with accepted field line resonance models.
Document ID
19870030581
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Engebretson, M. J.
(Johns Hopkins Univ. Laurel, MD, United States)
Zanetti, L. J.
(Johns Hopkins Univ. Laurel, MD, United States)
Potemra, T. A.
(Johns Hopkins University Laurel, MD, United States)
Acuna, M. H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1986
Publication Information
Publication: Geophysical Research Letters
Volume: 13
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
87A17855
Funding Number(s)
CONTRACT_GRANT: N00024-85-C-5301
Distribution Limits
Public
Copyright
Other

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