Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm42a..04m&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM42A-04
Other
2712 Electric Fields (2411), 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
We report broadband ULF waves of periods shorter than 600 s observed in the dayside magnetosphere by the EDI and FGM instruments on Cluster. In this study, we introduce spectral analysis to search for wave signals with high coherence between magnetic and electric field fluctuations. We determine the phase velocity of the waves by comparing the wave amplitudes of the magnetic and electric fields. We also use multiple spacecraft data in order to study the phase differences which, when combined with the separation between the spacecraft, gives a second estimate for the propagation velocity of the waves. The phase velocities determined by the above two methods are compared with each other in order to check for consistency. For the events with clear signatures in both magnetic and electric fields data, we identify the responsible interplanetary configurations. The physical implications of the waves are discussed using the results obtained.
Balogh André
Baumjohann Wolfgang
Farrugia Charles J.
Matsui Hideki
Paschmann Goetz
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