How are the VLF quasi-periodic emissions controlled by harmonics of field line oscillations? - The results of a comparison between ground and GEOS satellites measurements

Details How are the VLF quasi-periodic emissions controlled by harmonics of field line oscillations? - The results of a comparison between ground and GEOS satellites measurements How are the VLF quasi-periodic emissions controlled by harmonics of field line oscillations? - The results of a comparison between ground and GEOS satellites measurements

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.6899t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, June 1, 1986, p. 6899-6919. CNRS-CNES-supported research.

Physics

14

Earth Magnetosphere, Geos Satellites (Esa), Harmonic Radiation, Very Low Frequencies, Vlf Emission Recorders, Adiabatic Conditions, Anisotropy, Extremely Low Radio Frequencies, Geomagnetic Pulsations, Ground Stations, Magnetic Fields, Standing Waves

Scientific paper

Data on VLF and UHF waves observed in situ for the first time by the GEOS 1 and 2 satellites close to the equatorial plane are compared with ground-based measurements. The results permit a more complete explanation of quasi-periodic (QP) modulation. The data are described, and a general ground-satellite comparison of occurrence and spectra of simultaneous emission is given. A detailed study of some selected events shows that, when the GEOS data are taken into account, it is sometimes difficult to classify QP emissions as either type I or type II. It is suggested that QPs may be due to the same mechanism involving compressional harmonics of a standing fundamental ULF wave.

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