Search Publications
The structure of an earthward propagating magnetic flux rope early in its evolution: comparison of methods
Möstl, C.; Farrugia, C. J.; Khotyaintsev, Y. +4 more
We analyze a magnetic signature associated with the leading edge of a bursty bulk flow observed by Cluster at -19 RE downtail on 22 August 2001. A distinct rotation of the magnetic field was seen by all four spacecraft. This event was previously examined by Slavin et al. (2003b) using both linear force-free modeling as well as a curlome…
Mapping of coma anisotropies to plasma structures of weak comets: a 3-D hybrid simulation study
Kührt, E.; Knollenberg, J.; Motschmann, U. +3 more
The effects of coma anisotropies on the plasma environment of comets have been studied by means of a 3-D hybrid model which treats electrons as a massless, charge-neutralizing fluid, whereas ion dynamics are covered by a kinetic approach. From Earth-based observations as well as from in-situ spacecraft measurements the shape of the coma of many co…
Speed evolution of fast CME/shocks with SOHO/LASCO, WIND/WAVES, IPS and in-situ WIND data: analysis of kilometric type-II emissions
Gonzalez-Esparza, A.; Aguilar-Rodriguez, E.
Fast CME/shocks propagating in the interplanetary medium can generate kilometric Type II (km-TII) radio emissions at the local plasma frequency and/or its harmonic, so these radio emissions provide a means of remotely tracking CME/shocks. We apply a new analysis technique, using the frequency drift of km-TII spectrum obtained by the Thermal Noise …
Global observations of substorm injection region evolution: 27 August 2001
Cully, C.; Donovan, E.; Blake, J. B. +7 more
We present riometer and in situ observations of a substorm electron injection on 27 August 2001. The event is seen at more than 20 separate locations (including ground stations and 6 satellites: Cluster, Polar, Chandra, and 3 Los Alamos National Laboratory (LANL) spacecraft). The injection is observed to be dispersionless at 12 of these locations.…
Magnetospheric convection from Cluster EDI measurements compared with the ground-based ionospheric convection model IZMEM
Haaland, S. E.; Förster, M.; Gromova, L. I. +3 more
Cluster/EDI electron drift observations above the Northern and Southern polar cap areas for more than seven and a half years (2001-2008) have been used to derive a statistical model of the high-latitude electric potential distribution for summer conditions. Based on potential pattern for different orientations of the interplanetary magnetic field …
Drift-Alfvén waves in space plasmas - theory and mode identification
Krasnoselskikh, V. V.; Pokhotelov, O. A.; Onishchenko, O. G. +1 more
The theory of drift-Alfvén waves with the spatial scales comparable to the ion Larmor radius is developed. The dispersion relation, the wave impedance and variations of the plasma density perturbations versus the wave frequency are investigated. The relevance of theoretical results obtained to the Cluster observations in the cusp and near a reconn…
On the error estimation of multi-spacecraft timing method
Zhang, H.; Zong, Q. -G.; Fu, S. Y. +4 more
The multi-spacecraft timing method, a data analysis technique based on four-point measurements to obtain the normal vector and velocity of an observed boundary, has been widely applied to various discontinuities in the solar wind and the magnetosphere studies. In this paper, we perform simulations to analyze the errors of the timing method by spec…
Rosetta swing-by at Mars - an analysis of the ROMAP measurements in comparison with results of 3-D multi-ion hybrid simulations and MEX/ASPERA-3 data
Lundin, R.; Fränz, M.; Edberg, N. J. T. +8 more
The Rosetta spacecraft flew by Mars at a distance of 260 km on 25 February 2007 during a gravity assist manoeuvre. During the closest approach (CA) the lander magnetometer ROMAP was switched on. The dataset taken during this swingby provides insight into the plasma environment around Mars: in addition to a pronounced bow shock crossing Rosetta rec…
Remote sensing of local structure of the quasi-perpendicular Earth's bow shock by using field-aligned beams
Lucek, E. A.; Kucharek, H.; Möbius, E. +4 more
Field-aligned ion beams (FABs) originate at the quasi-perpendicular Earth's bow shock and constitute an important ion population in the foreshock region. The bulk velocity of these FABs depends significantly on the shock normal angle, which is the angle between shock normal and upstream interplanetary magnetic field (IMF). This dependency may ther…
Concerning the occurrence pattern of flux transfer events on the dayside magnetopause
Sibeck, D. G.
We present an analytical model for the magnetic field perturbations associated with flux transfer events (FTEs) on the dayside magnetopause as a function of the shear between the magnetosheath and magnetospheric magnetic fields and the ratio of their strengths. We assume that the events are produced by component reconnection along subsolar reconne…