Search Publications
Central position of the source region of storm-time chorus
Gurnett, D. A.; Pickett, J. S.; Santolík, O. +2 more
We describe an analysis method to estimate the central position of the source region of electromagnetic waves. The method is based on simultaneous measurements of the Poynting flux in several points in space. We analyze measurements of whistler-mode chorus by the four spacecraft of the Cluster mission close to their perigee at a radial distance of…
Initial results of a survey of equatorial noise emissions observed by the Cluster spacecraft
de Conchy, Y.; Santolík, O.; Němec, F. +3 more
Initial results of a survey of equatorial noise emissions are presented. These plasma wave emissions are observed in the inner magnetosphere close to the geomagnetic equator at frequencies below the local lower hybrid frequency. We use the data recorded by the four Cluster spacecraft during the first 24 months of measurements. The data set was pro…
Reconstruction of the magnetotail current sheet structure using multi-point Cluster measurements
Balogh, A.; Zhang, T. L.; Nakamura, R. +7 more
In this paper we analyze the vertical structure of the magnetotail current sheet for a few intervals during which Cluster repeatedly crosses the neutral sheet due to fast flapping motion. They include fast flows with episodes of flow reversals. The curl, gradient and divergence of the magnetic field are estimated using linear gradient/curl estimat…
Improved bow shock model with dependence on the IMF strength
Němeček, Z.; Šafránková, J.; Jelínek, K. +2 more
The presence of the bow shock in front of an obstacle immersed into a supersonic flow of collisionless plasma has been theoretically predicted and experimentally confirmed more than 40 years ago. However, in spite of a great effort of theoreticians and experimenters, we are still not able to predict the bow shock location under varying upstream co…
Bifurcated current sheet: model and Cluster observations
Sauvaud, J. -A.; Balogh, A.; Génot, V. +3 more
Cluster observations have recently confirmed previous ISEE and Geotail observations showing that the magnetotail current sheet can present a bifurcated structure with two off-centre current peaks. We show in this paper that such a structure can be described by a kinetic tangential equilibrium which is an exact solution of the Vlasov-Maxwell equati…
High resolution observations of continuum radiation
Gurnett, D. A.; Pickett, J. S.; Santolik, O. +1 more
The Polar spacecraft has identified near-source regions of continuum emission in the plasmapause and outer plasmasphere. As in the case of kilometric continuum (KC), near-source regions of continuum emission often display a high resolution fine structure of closely spaced bands of emission. The separation of the bands is much less than the local g…
Spatial structure of beamlets according to Cluster observations
Zelenyi, L. M.; Sauvaud, J. -A.; Dunlop, M. W. +4 more
Beamlets are sporadic bursty ion beams with energies about 10-30 keV observed in the lobes - plasma sheet interface. To investigate the spatial structure of this phenomenon we used Cluster data for the fall and summer of 2001 time interval. Both case study and statistical study have been performed. At a later stage of statistical study Interball d…