Abstract
Satellite measurements of magnetospheric radio noise occurring between the local plasma and upper hybrid resonance frequencies are presented. This noise form has been observed over the entire latitude range studied (30° to 84°) in the northern hemisphere. Both the occurrence frequency and intensity of the noise are greatest in the auroral zone, a secondary peak in occurrence frequency occurs at an L value ≅1·4. The distribution of noise intensity in the auroral zone exhibits a well defined peak in invariant latitude which moves from ∼67° at midnight to ∼77° at noon with the most intense events occurring near midnight. The distribution of noise intensity closely matches the distribution of low energy electrons. These observations are shown to be consistent with the hypothesis that the responsible mechanism is Cerenkov radiation.
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