Ion cyclotron waves in the EarthÂ’s magnetotail during CASSINIÂ’s Earth swing-by

Details Ion cyclotron waves in the EarthÂ’s magnetotail during CASSINIÂ’s Earth swing-by Ion cyclotron waves in the EarthÂ’s magnetotail during CASSINIÂ’s Earth swing-by

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003angeo..21.2043b&link_type=abstract

Annales Geophysicae, vol. 21, Issue 10, pp.2043-2057

Physics

2

Scientific paper

The properties of low frequency magnetotail waves observed during CASSINI’s Earth swing-by are examined. A maximum in the distribution of the waves about half the proton cyclotron frequency and a peak at linear polarisation are found and their implications are analysed in detail. Data on the fluid plasma velocity for the observation interval are not available and thus no unique conclusions about Doppler shift influence on the properties of the waves can be made. This determines the need to analyse different hypotheses in order to understand the origin of the waves. The plausibility of competing interpretations, such as off-resonance proton cyclotron waves and bi-ion cyclotron waves at the gyrofrequency of a heavy ion component of the magneto-tail plasma in the form of He ++ ions of solar wind origin is questioned.

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