Search Publications
Plasma and fields in the wake of Rhea: 3-D hybrid simulation and comparison with Cassini data
Krupp, N.; Woch, J.; Fränz, M. +7 more
Rhea's magnetospheric interaction is simulated using a three-dimensional, hybrid plasma simulation code, where ions are treated as particles and electrons as a massless, charge-neutralizing fluid. In consistency with Cassini observations, Rhea is modeled as a plasma absorbing obstacle. This leads to the formation of a plasma wake (cavity) behind t…
Comparison of multi-point measurements of current sheet structure and analytical models
Malova, H. V.; Petrukovich, A. A.; Zelenyi, L. M. +5 more
Current density profiles of 22 thin current sheets, crossed by four Cluster spacecraft in the magnetotail are compared with the self-consistent model of anisotropic 1-D equilibrium, including several species of quasi-adiabatic (transient) ions and drifting electrons. In order to examine ion-scale features of the current density profile Cluster dat…
On the edge of the foreshock: model-data comparisons
Dandouras, I.; Lucek, E.; Omidi, N. +1 more
We present the results of a global hybrid code simulation for the solar wind-interaction with the Earth's magnetosphere during an interval of steady radial IMF. The model predicts a foreshock marked by innumerable localized, correlated, and large amplitude, density and magnetic field strength variations, depressed velocities, and enhanced temperat…
Relationship between solar wind corotating interaction regions and the phasing and intensity of Saturn kilometric radiation bursts
Cecconi, B.; Lamy, L.; Badman, S. V. +2 more
Voyager spacecraft measurements of Saturn kilometric radiation (SKR) identified two features of these radio emissions: that they pulse at a period close to the planetary rotation period, and that the emitted intensity is correlated with the solar wind dynamic pressure (Desch and Kaiser, 1981; Desch, 1982; Desch and Rucker, 1983). In this study the…
An assessment of the role of the centrifugal acceleration mechanism in high altitude polar cap oxygen ion outflow
Lundin, R.; Yamauchi, M.; Sauvaud, J. -A. +11 more
The role of the centrifugal acceleration mechanism for ion outflow at high altitude above the polar cap has been investigated. Magnetometer data from the four Cluster spacecraft has been used to obtain an estimate of magnetic field gradients. This is combined with ion moment data of the convection drift and the field-aligned particle velocity. Thu…
Observed tail current systems associated with bursty bulk flows and auroral streamers during a period of multiple substorms
Dandouras, I.; Lucek, E.; Fazakerley, A. N. +10 more
We present a multi-instrument study of a substorm bursty bulk flow (BBF) and auroral streamer. During a substorm on 25 August 2003, which was one of a series of substorms that occurred between 00:00 and 05:00 UT, the Cluster spacecraft encountered a BBF event travelling Earthwards and duskwards with a velocity of ~500 km s-1 some nine m…
Magnetic clouds seen at different locations in the heliosphere
Zhukov, A. N.; Rodriguez, L.; Mandrini, C. H. +9 more
We analyze two magnetic clouds (MCs) observed in different points of the heliosphere. The main aim of the present study is to provide a link between the different aspects of this phenomenon, starting with information on the origins of the MCs at the Sun and following by the analysis of in-situ observations at 1 AU and at Ulysses. The candidate sou…
Plasma convection in the magnetotail lobes: statistical results from Cluster EDI measurements
Quinn, J.; Haaland, S.; Paschmann, G. +5 more
A major part of the plasma in the Earth's magnetotail is populated through transport of plasma from the solar wind via the magnetotail lobes. In this paper, we present a statistical study of plasma convection in the lobes for different directions of the interplanetary magnetic field and for different geomagnetic disturbance levels. The data set us…
Observations of recurrent cosmic ray decreases during solar cycles 22 and 23
Gómez-Herrero, R.; Heber, B.; Müller-Mellin, R. +5 more
During solar cycle 22, the modulation of several hundred MeV galactic cosmic rays (GCRs) by recurrent and transient cosmic ray decreases was observed by the Ulysses spacecraft on its descent towards the solar south pole. In solar cycle 23, Ulysses repeated this trajectory segment during a similar phase of the solar cycle, but with opposite heliosp…
Spatio-temporal structure of a poloidal Alfvén wave detected by Cluster adjacent to the dayside plasmapause
Pierrard, V.; Glassmeier, K. H.; Blomberg, L. G. +4 more
A case study of a poloidal ULF pulsation near the dayside plasmapause is presented based on Cluster observations of magnetic and electric fields. The pulsation is detected close to the magnetic equatorial plane at L shells L=[4.4, 4.6] and oscillates with a frequency of f=23 mHz. Investigating the wave energy flux reveals the standing wave nature …