Search Publications
Coordinated studies of the geospace environment using Cluster, satellite and ground-based data: an interim review
Wild, J. A.; Lester, M.; Nakamura, R. +10 more
A little more than four years after its launch, the first magnetospheric, multi-satellite mission Cluster has already tremendously contributed to our understanding about the coupled solar wind - magnetosphere - ionosphere system. This is mostly due to its ability, for the first time, to provide instantaneous spatial views of structures in the syst…
Poloidal ULF oscillations in the dayside magnetosphere: a Cluster study
Glassmeier, K. -H.; Blomberg, L. G.; Eriksson, P. T. I. +1 more
Three ULF wave events, all occurring in the dayside magnetopshere during magnetically quiet times, are studied using the Cluster satellites. The multi-point measurements obtained from Cluster are used to determine the azimuthal wave number for the events by means of the phase shift and the azimuthal separation between the satellites. Also, the pol…
Polar heating in Saturn's thermosphere
Müller-Wodarg, I. C. F.; Miller, S.; Smith, C. G. A. +1 more
A 3-D numerical global circulation model of the Kronian thermosphere has been used to investigate the influence of polar heating. The distributions of temperature and winds resulting from a general heat source in the polar regions are described. We show that both the total energy input and its vertical distribution are important to the resulting t…
The STAFF-DWP wave instrument on the DSP equatorial spacecraft: description and first results
Belmont, G.; Bouzid, V.; Santolík, O. +13 more
The STAFF-DWP wave instrument on board the equatorial spacecraft (TC1) of the Double Star Project consists of a combination of 2 instruments which are a heritage of the Cluster mission: the Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment and the Digital Wave-Processing experiment (DWP). On DSP-TC1 STAFF consists of a three-axis s…
Cluster and Double Star observations of dipolarization
Balogh, A.; Zhang, T. L.; Dandouras, I. +15 more
We studied two types of dipolarization events with different IMF conditions when Cluster and Double Star (TC-1) were located in the same local time sector: 7 August 2004, 18:00-24:00 UT, during a disturbed southward/northward IMF interval, and 14 August 2004, 21:00-24:00 UT, when the IMF was stably northward. Cluster observed dipolarization as wel…
Electron-scale sheets of whistlers close to the magnetopause
Lavraud, B.; André, M.; Stenberg, G. +6 more
Whistler emissions close to the magnetopause on the magnetospheric side are investigated using the four Cluster spacecraft. The waves are found to be generated in thin (electron-scale) sheets moving with the plasma drift velocity. A feature in the electron data coincides with the waves; hot magnetospheric electrons disappear for a few satellite sp…
Energetic particle fluxes in the exterior cusp and the high-latitude dayside magnetosphere: statistical results from the Cluster/RAPID instrument
Asikainen, T.; Mursula, K.
In this paper we study the fluxes of energetic protons (30 4000 keV) and electrons (20 400 keV) in the exterior cusp and in the adjacent high-latitude dayside plasma sheet (HLPS) with the Cluster/RAPID instrument. Using two sample orbits we demonstrate that the Cluster observations at high latitudes can be dramatically different because the satell…
A statistical study of intense electric fields at 4-7 RE geocentric distance using Cluster
Buchert, S.; Karlsson, T.; Marklund, G. +3 more
Intense high-latitude electric fields (>150 mV/m mapped to ionospheric altitude) at 4 7 RE geocentric distance have been investigated in a statistical study, using data from the Cluster satellites. The orbit of the Cluster satellites limits the data collection at these altitudes to high latitudes, including the poleward part of the a…
Statistical phase propagation and dispersion analysis of low frequency waves in the magnetosheath
Fränz, M.; Dandouras, I.; Glassmeier, K. -H. +3 more
We present the results of a statistical analysis of low-frequency fluctuations in the high latitude regions of the dayside magnetosheath using CLUSTER as a wave telescope. Magnetic field observations are used to determine wave propagation directions and wave numbers for selected frequencies. Using observations of the plasma flow velocity we correc…
Evidence of transverse magnetospheric field line oscillations as observed from Cluster and ground magnetometers
Balogh, A.; Wild, J. A.; Yeoman, T. K. +3 more
The dynamic spectrum of ULF waves from magnetic field data obtained by the elliptically orbiting Cluster satellites (with an apogee of 119000km, perigee of 19000km and the orbital period of 57h) have been prepared in the frequency range 0 to 120mHz when the satellite was near its perigee. The existence of field line oscillations, with increasing f…