Abstract
We report the first satellite observations of protons involved in the generation of IPDP (intervals of pulsations of diminishing periods). Fifteen IPDP events observed on the ground during the period December 1971-February 1972 were correlated with particle data obtained on the Explorer 45 satellite. The analyses suggest that the IPDP events were generated by the proton cyclotron instability with westward drifting protons with energies of 1–100 keV; the approximate locations of the instability regions at the onset (low-frequency) of IPDP generation were generally near the plasmapause and were at L values between 4.7 and 5.5 with the majority at values between 5.0 and 5.3 in the afternoon/evening sector between 1700 and 2300 LT.
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