Large-amplitude ion bounce wave in the magnetosphere near L = 3

Details Large-amplitude ion bounce wave in the magnetosphere near L = 3 Large-amplitude ion bounce wave in the magnetosphere near L = 3

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..479l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, June 1983, p. 479-481.

Physics

6

Geomagnetic Pulsations, Ionic Waves, Magnetic Storms, Magnetospheric Instability, Low Frequencies, Magnetometers, Power Spectra

Scientific paper

Large amplitude (about 30 nT), high frequency (about 0.14 Hz) geomagnetic field oscillations were observed superimposed on lower frequency ones (about 0.008 Hz) at L = 3 during a large magnetic storm. These are the largest amplitude oscillations ever reported in the Pc2 frequency band (0.1-0.5 Hz). Measurements at two stations spaced in azimuth by about 240 km show the higher frequency waves to occur at the same time at both locations. The higher frequency oscillations, which have larger amplitudes at the station closer to local midnight, are consistent with a wave excited by the bounce motion of protons with a peak in the energy distribution at about 100 keV. The longer-period variations, which are highly non-correlated betweeen the two locations, could be evidence of a surface 'wave' on the plasmapause.

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