Search Publications
Causal relationships between eruptive prominences and coronal mass ejections
Filippov, B.; Koutchmy, S.
A close association between eruptive prominences and CMEs, both slow and fast CMEs, was reported in many studies. Sometimes it was possible to follow the material motion starting from the prominence (filament) activation to the CME in the high corona. Remnants of the prominence were found in the bright core of the CME. However, detailed comparison…
Survey of ELF-VLF plasma waves in outer radiation belt observed by Cluster STAFF-SA experiment
Cornilleau-Wehrlin, N.; Pokhotelov, D.; Lefeuvre, F. +1 more
Various types of plasma waves have profound effects on acceleration and scattering of radiation belt particles. For the purposes of radiation belt modeling it is necessary to know statistical distributions of plasma wave parameters. This paper analyzes four years of plasma wave observations in the Earth's outer radiation belt obtained by the STAFF…
Formation of current density profile in tilted current sheets
Petrukovich, A. A.; Nakamura, R.; Baumjohann, W. +1 more
We investigate Cluster observations of strongly tilted sheets (flapping events) in the magnetotail. In accordance with the simple model of slip deformation (vertical differential displacement of neighboring flux tubes), the Jy current density component in the tilted sheet remains constant and equal to that in the horizontal undisturbed …
Why are CMEs large-scale coronal events: nature or nurture?
Mandrini, C. H.; van Driel-Gesztelyi, L.; Démoulin, P. +2 more
The apparent contradiction between small-scale source regions of, and large-scale coronal response to, coronal mass ejections (CMEs) has been a long-standing puzzle. For some, CMEs are considered to be inherently large-scale events eruptions in which a number of flux systems participate in an unspecified manner, while others consider magnetic reco…
Lower hybrid waves at the shock front: a reassessment
André, M.; Dunlop, M. W.; Walker, S. N. +3 more
The primary process occurring at a collisionless shock is the redistribution of the bulk upstream energy into other degrees of freedom. One part of this process results in the acceleration of electrons at the shock front. Accelerated electrons are observed at the terrestrial and other planetary shocks, comets, and their effects are observed in ast…
High-latitude plasma convection during Northward IMF as derived from in-situ magnetospheric Cluster EDI measurements
Haaland, S. E.; Torbert, R. B.; Quinn, J. M. +4 more
In this study, we investigate statistical, systematic variations of the high-latitude convection cell structure during northward IMF. Using 1-min-averages of Cluster/EDI electron drift observations above the Northern and Southern polar cap areas for six and a half years (February 2001 till July 2007), and mapping the spatially distributed measurem…
Frequencies of wave packets of whistler-mode chorus inside its source region: a case study
Gurnett, D. A.; Pickett, J. S.; Trakhtengerts, V. Y. +5 more
Whistler-mode chorus is a structured wave emission observed in the Earth's magnetosphere in a frequency range from a few hundreds of Hz to several kHz. We investigate wave packets of chorus using high-resolution measurements recorded by the WBD instrument on board the four Cluster spacecraft. A night-side chorus event observed during geomagnetical…
Access of solar wind electrons into the Martian magnetosphere
Barabash, S.; Lundin, R.; Winningham, J. D. +7 more
Electrons with energy of ~40 80 eV measured by the instrument ASPERA-3 on Mars Express and MAG-ER onboard Mars Global Surveyor are used to trace an access of solar wind electrons into the Martian magnetosphere. Crustal magnetic fields create an additional protection from solar wind plasma on the dayside of the Southern Hemisphere by shifting the b…
The statistics of foreshock cavities: results of a Cluster survey
Schwartz, S. J.; Sibeck, D. G.; Billingham, L.
We use Cluster magnetic field, thermal ion, and energetic particle observations upstream of the Earth's bow shock to investigate the occurrence patterns of foreshock cavities. Such cavities are thought to form when bundles of magnetic field connect to the quasi-parallel bow shock. Shock-processed suprathermal ions can then stream along the field, …
Coupled rotational dynamics of Saturn's thermosphere and magnetosphere: a thermospheric modelling study
Smith, C. G. A.; Aylward, A. D.
We use a numerical model of Saturn's thermosphere to investigate the flow of angular momentum from the atmosphere to the magnetosphere. The thermosphere model is driven by Joule heating and ion drag calculated from a simple model of the magnetospheric plasma flows and a fixed model of the ionospheric conductivity. We describe an initial study in w…