Geomagnetic field-line resonant harmonics measured by the Viking and AMPTE/CCE magnetic field experiments

Details Geomagnetic field-line resonant harmonics measured by the Viking and AMPTE/CCE magnetic field experiments Geomagnetic field-line resonant harmonics measured by the Viking and AMPTE/CCE magnetic field experiments

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..427z&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, April 1987, p. 427-430. Navy-NSF-NASA-supported research.

Physics

18

Ampte (Satellites), Geomagnetic Pulsations, Harmonic Oscillation, Scientific Satellites, Fourier Transformation, Resonance, Spectrograms

Scientific paper

The first simultaneous observations of multiple harmonic, azimuthally polarized, ULF pulsations at two points along a geomagnetic flux tube in space are reported. In March 1986, the elliptically orbiting equatorial AMPTE/CCE satellite was oriented with the apogee near 0830 h MLT, and the orbital plane of the polar-orbiting Viking satellite was at 1000 MLT. The satellites were situated within approximately the same flux tube but with an effective separation of approximately 10 R(e) near L = 8 on the inbound pass of the AMPTE/CCE orbit. Structured harmonic pulsations were observed by the magnetic field experiments on both spacecraft, and they appeared to turn off and on simultaneously at both locations. Both the observations and the relative amplitudes along the magnetic field lines support recent ideas of multiple field-line resonances of Alfven waves.

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