Physics – Plasma Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ssc43n&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 13, pp. SSC 43-1, CiteID 1710, DOI 10.1029/2003GL017432
Physics
Plasma Physics
11
Space Plasma Physics: Waves And Instabilities, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Interplanetary Physics: Solar Wind Plasma
Scientific paper
Cluster provides us with a unique possibility to study ULF waves. We analyze ULF wave activity in the near-Earth upstream solar wind. Using Cluster as a wave telescope we investigate in detail wave propagation directions and wave numbers for various frequencies, obtaining, for the first time, three dimensional dispersion relations experimentally. After Doppler shift correction, we find that the dispersion relations are not linear and the waves are propagating in the sunward direction in the plasma rest frame. Comparison of the experimentally derived dispersion relation with that one for a beam plasma system shows good agreement. We suggest that the ULF waves in the foreshock are generated by a proton population backstreaming from the shock.
Dandouras Iannis
Fornacon Karl-Heinz
Georgescu Edita
Glassmeier Karl-Heintz
Motschmann Uwe
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