Journal
ANNALES GEOPHYSICAE
Volume 21, Issue 7, Pages 1457-1465Publisher
EUROPEAN GEOPHYSICAL SOC
DOI: 10.5194/angeo-21-1457-2003
Keywords
interplanetary physics; MHD waves and turbulence; planetary bow shocks; space plasma physics; wave particle interactions
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The terrestrial foreshock is characterised by the existence of large amplitude ultra low frequency waves. The majority of such waves are observed to be left-handed in the spacecraft frame, but are in fact intrinsically right-handed and have been identified as fast-magnetosonic waves. More rarely observed are waves that are right-handed in the spacecraft frame. Cluster four spacecraft observations of such waves are presented and analysed using multi-spacecraft techniques; in particular the k-filtering/wave telescope technique is used. The waves are found to be left-handed and propagating sunwards in the plasma rest frame, and are, therefore, identified as Alfvenic. The convection of the waves anti-sunward in the solar wind flow causes the observed polarisation to be reversed. Generation mechanisms are discussed.
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