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Field line resonances have been observed for decades by ground-based and insitu instruments. The driving mechanism(s) are still unclear, althoughprevious work has provided strong grounds that coherent waves in the solarwind may be a source. Here we present further evidence, with the use ofmultitaper analysis, a sophisticated spectrum estimation technique. A set ofwindows (dpss tapers) is chosen with characteristics that best suit the widthof the narrowband peaks to be identified. The orthogonality of the windowsallows for a confidence level (of say 95%) against a null hypothesis of anoisy spectrum, so that significant peaks can be identified. Employingmultitaper analysis we can determine the phase and amplitude coherence at thesampling rate of the data sets and, over their entire duration. Thesecharacteristics make this technique superior to single windowing or waveletanalysis. A high degree of phase and amplitude (greater then 95%) coherenceis demonstrated between a 2.1 mHz field line resonance observed by the SHAREradar at Sanae, Antarctica and the solar wind oscillation detected by WINDand ACE satellites

Coherence between radar observations of magnetospheric field line resonances and discrete oscillations in the solar wind