On propagation direction of ring current proton ULF waves observed by ATS 6 at 6.6 R sub E

Details On propagation direction of ring current proton ULF waves observed by ATS 6 at 6.6 R sub E On propagation direction of ring current proton ULF waves observed by ATS 6 at 6.6 R sub E

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1859s&link_type=abstract

Journal of Geophysical Research, vol. 82, May 1, 1977, p. 1859-1868.

Physics

7

Earth Magnetosphere, Extremely Low Frequencies, Proton Flux Density, Ring Currents, Satellite Observation, Ats 6, Geomagnetism, Particle Telescopes, Phase Shift, Radiation Detectors

Scientific paper

From June 11 to September 16, 1974, the NOAA low-energy proton detector on board the ATS 6 satellite observed 71 cases of ultralow-frequency oscillations of proton flux intensities. The oscillation periods varied from 40 s to 6 min, and the events were observed most frequently during moderate geomagnetic conditions. The flux oscillations occurred at various local times, yet almost two thirds of the events were detected in the near-dusk region of the magnetosphere. For a majority of the events in this set a substantial phase shift in flux oscillation was detected between different energy channels and/or between two oppositely oriented detector telescopes. The phase shift is mainly due to the finite gyroradius effect of the protons gyrating in the geomagnetic field. By examining this finite gyroradius effect on the perturbed particle distribution function associated with the wave in a nonuniform magnetic field, the propagation direction of the wave from particle observations made by a single spacecraft is determined

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