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Kintner & Gurnett 1977
Kintner, P.M. and Gurnett, D.A. (1977). Observations of ion cyclotron waves within the plasmasphere by Hawkeye 1. Journal of Geophysical Research 82: doi: 10.1029/JA082i016p02314. issn: 0148-0227.

A survey of the plasma wave data from the Hawkeye I spacecraft has been performed in search of ion cyclotron waves associated with the scattering and loss of ring current ions within the near the plasma-pause. During an 18-month period, consisting of about 270 orbits, a total of five events have been found with clearly detectable electric and magnetic fields at frequencies below the proton gyrofrequency. Comparisons of the electric and magnetic field amplitudes for these events provide strong evidence that these waves are ion cyclotron waves. All five events occurred during recovery phases of magnetic storms inside or very close to the plasmapause boundary. The results of this survey confirm and are consistent with the earlier identification of ion cycltron waves by the Explorer 45 satellites. The Hawkeye I observations show that ion cyclotron waves of substantial amplitude occur at magnetic latitudes well away (~28¿) from the magnetic equator.

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Journal
Journal of Geophysical Research
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American Geophysical Union
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