Abstract
v.l.f. emissions associated with the enhancement of ring-current electrons during magnetic storms and substorms have been detected by the satellite S3-A (Explorer 45) on an equatorial orbit1,2. The emissions observed near the geomagnetic equator consist of essentially two frequency regimes; one above the electron gyrofrequency at the equator, fH—the electrostatic mode3–5, which peak near (n+1/2)fH, where n is positive integer (emissions up to n = 10 have been observed2)—and the other below fH—the whistler mode, which has a conspicuous gap at exactly fH/2. Here we describe the characteristics of this v.l.f. emission and the associated enhancements in electron intensity as well as the anisotropies of the ring-current electron distribution, and we also give an interpretation of the bimodal frequency distribution of the equatorial whistler mode emissions. This distribution has been known for the past few years but has not been well explained6,7.
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MAEDA, K., SMITH, P. & ANDERSON, R. v.l.f. emission from ring-current electrons. Nature 263, 37–41 (1976). https://doi.org/10.1038/263037a0
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DOI: https://doi.org/10.1038/263037a0
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