Search Publications
SMEI direct, 3-D-reconstruction sky maps, and volumetric analyses, and their comparison with SOHO and STEREO observations
Jackson, B. V.; Buffington, A.; Hick, P. P. +2 more
In this paper we present the results of the analysis of the late January 2007 Coronal Mass Ejection (CME) events recorded by the Solar Mass Ejection Imager (SMEI), the Solar TErrestrial RElations Observatory (STEREO), and the SOlar and Heliospheric Observatory (SOHO) spacecraft. This period occurs when the two STEREO spacecraft views are from clos…
Coronal magnetic fields inferred from IR wavelength and comparison with EUV observations
Liu, Y.
Spectropolarimetry using IR wavelength of 1075 nm has been proved to be a powerful tool for directly mapping solar coronal magnetic fields including transverse component directions and line-of-sight component intensities. Solar tomography, or stereoscopy based on EUV observations, can supply 3-D information for some magnetic field lines in bright …
Occurrence and location of concentrated load and generator regions observed by Cluster in the plasma sheet
Dandouras, I.; Hamrin, M.; Norqvist, P. +4 more
Here, and in a companion paper by Hamrin et al. (2009) [Scale size and life time of energy conversion regions observed by Cluster in the plasma sheet], we investigate localized energy conversion regions (ECRs) in the Earth's plasma sheet. In total we have studied 151 ECRs within 660 h of plasma sheet data from the summer and fall of 2001 when Clus…
Solar stereoscopy - where are we and what developments do we require to progress?
Feng, L.; Inhester, B.; Wiegelmann, T.
Observations from the two STEREO-spacecraft give us for the first time the possibility to use stereoscopic methods to reconstruct the 3-D solar corona. Classical stereoscopy works best for solid objects with clear edges. Consequently an application of classical stereoscopic methods to the faint structures visible in the optically thin coronal plas…
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…