Physics – Optics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..583s&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 8, Sept. 1990, p. 583-588. Research supported by SERC and NERC.
Physics
Optics
1
Ampte (Satellites), Magnetopause, Plasma Waves, Propagation Modes, Whistlers, Gyrofrequency, Magnetospheric Instability, Refractivity
Scientific paper
AMPTE-UKS observations are used to show that the intensification of whistler-mode waves observed near the earthward boundary of the earth's magnetopause can be related to wave trapping in this region. In particular, the local increase in intensity of whistler-mode waves at frequencies, f, below about half the local electron gyrofrequency, fH/2, during the magnetopause encounter on October 9, 1984 was accompanied by a corresponding increase in the component of the whistler-mode refractive index in the direction parallel to the magnetic field, N-parallel. A similar amplitude increase of waves at f not less than fH/2 was observed on October 2, 1984 and was accompanied by a decrease of N-parallel. In both cases, consideration of geometrical optics predicts wave trapping in the region where the intense waves were actually observed.
Sazhin Sergei S.
Walker S. N.
Woolliscroft Les J. C.
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