Ion cyclotron waves in the high altitude cusp: CLUSTER observations at varying spacecraft separations

Details Ion cyclotron waves in the high altitude cusp: CLUSTER observations at varying spacecraft separations Ion cyclotron waves in the high altitude cusp: CLUSTER observations at varying spacecraft separations

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ssc12n&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 24, pp. SSC 12-1, CiteID 2263, DOI 10.1029/2003GL018594

Physics

Plasma Physics

13

Interplanetary Physics: Plasma Waves And Turbulence, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Transport Processes, Space Plasma Physics: Wave/Particle Interactions

Scientific paper

We have analysed high-resolution Cluster magnetic field data during three high-altitude cusp crossings in 2001 and 2002. The Cluster separations for these crossings varied between 100 and 600 km and therefore provided an unique opportunity to study wave properties at different length scales. In the cusp Cluster sees frequent intervals of magnetic field fluctuations with clear peaks in power close to the local ion cyclotron frequency, and both left- and right-handed polarisations. At large separations the power seen at different spacecraft can differ by orders of magnitude. For smaller separations, the power seen at the four spacecraft agrees better but still shows some differences. For all separations there was no significant correlation between the signals seen at different spacecraft, indicative of very local structure. The origin of the waves appears to lie in highly filamented sheared plasma flows present in the cusp.

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