Substorm effects on spectral structures of Pc 1 waves at synchronous orbit

Details Substorm effects on spectral structures of Pc 1 waves at synchronous orbit Substorm effects on spectral structures of Pc 1 waves at synchronous orbit

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..143i&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 1, 1987, p. 143-158.

Physics

33

Geomagnetic Micropulsations, Magnetic Storms, Magnetospheric Ion Density, Plasma Frequencies, Plasma Waves, Plasma-Electromagnetic Interaction, Ats 1, Diurnal Variations, Geosynchronous Orbits, Magnetic Flux, Plasma Density, Spectral Bands

Scientific paper

Pc 1 waves observed at synchronous orbit are studied using magnetic field data from the flux gate magnetometer on board the ATS 6. The data were obtained in the interval of June to September in 1975 when the satellite was located at the geographic equator at 36 deg east longitude near the geomagnetic equator. It is found that spectral structures of Pc 1 waves are significantly affected by variations of the magnitude of the local magnetic field near the geomagnetic equator. Spectral bands of Pc 1 waves are usually confined to the frequency range below the helium gyrofrequency when Pc 1 waves appear on the afternoon side accompanied by a decrease in the ambient magnetic field during substorms. In the daytime, Pc 1 waves often occur in association with an increase in the ambient magnetic field caused by a magnetospheric compression. In such cases, Pc 1 waves tend to appear in the frequency range above the helium gyrofrequency. The sense of polarization is left-handed for most waves, as was noted in previous studies. It is suggested from the linear growth rate analysis that the absence of Pc 1 waves in the frequency range above the helium gyrofrequency during substorms is mainly due to an increase in the energetic proton flux.

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