Search Publications
Ion drift simulation of sudden appearance of sub-keV structured ions in the inner magnetosphere
Yamauchi, M.; Dandouras, I.; Nilsson, H. +1 more
Energy-latitude dispersed structured sub-keV ions in the inner magnetosphere often show significant development or intensification (by more than factor of 3) within 1-2 h near noon or afternoon where the azimuthal ion drift velocity at the sub-keV range is expected to be near zero. To examine whether such sudden appearances in the dayside can be e…
Aspects of magnetosphere-ionosphere coupling in sawtooth substorms: a case study
Farrugia, C. J.; Sandholt, P. E.
In a case study we report on repetitive substorm activity during storm time which was excited during Earth passage of an interplanetary coronal mass ejection (ICME) on 18 August 2003. Applying a combination of magnetosphere and ground observations during a favourable multi-spacecraft configuration in the plasma sheet (GOES-10 at geostationary alti…
Analysis of double-step response to an interplanetary shock in the dayside magnetosphere
Kilpua, E. K. J.; Koskinen, H. E. J.; Juusola, L. +1 more
We present an analysis of double-step magnetic field enhancement caused by interplanetary (IP) shock impacts on the Earth's magnetosphere. The structures were observed by the GOES-8, 10, 11, and 12 spacecraft in the dayside geostationary orbit, particularly during northward interplanetary magnetic field (IMF) conditions. The double-step structures…
Observation of shocks associated with CMEs in 2007
Zhang, T. L.; Balikhin, M. A.; Taktakishvili, A. +1 more
The interaction of CMEs with the solar wind can lead to the formation of interplanetary shocks. Ions accelerated at these shocks contribute to the solar energetic protons observed in the vicinity of the Earth. Recently a joint analysis of Venus Express (VEX) and STEREO data by Russell et al. (2009) have shown that the formation of strong shocks as…
Data-based modelling of the Earth's dynamic magnetosphere: a review
Tsyganenko, N. A.
This paper reviews the main advances in the area of data-based modelling of the Earth's distant magnetic field achieved during the last two decades. The essence and the principal goal of the approach is to extract maximum information from available data, using physically realistic and flexible mathematical structures, parameterized by the most rel…
Parametric validations of analytical lifetime estimates for radiation belt electron diffusion by whistler waves
Artemyev, A. V.; Agapitov, O. V.; Krasnoselskikh, V. V. +1 more
The lifetimes of electrons trapped in Earth's radiation belts can be calculated from quasi-linear pitch-angle diffusion by whistler-mode waves, provided that their frequency spectrum is broad enough and/or their average amplitude is not too large. Extensive comparisons between improved analytical lifetime estimates and full numerical calculations …
Discontinuities and Alfvénic fluctuations in the solar wind
Haaland, S.; Paschmann, G.; Knetter, T. +1 more
We examine the Alfvénicity of a set of 188 solar wind directional discontinuities (DDs) identified in the Cluster data from 2003 by Knetter (2005), with the objective of separating rotational discontinuities (RDs) from tangential ones (TDs). The DDs occurred over the full range of solar wind velocities and magnetic shear angles. By performing the …
Statistical study of foreshock cavitons
Sauvaud, J. -A.; Russell, C. T.; Dandouras, I. +5 more
In this work we perform a statistical analysis of 92 foreshock cavitons observed with the Cluster spacecraft 1 during the period 2001-2006. We analyze time intervals during which the spacecraft was located in the Earth's foreshock with durations longer than 10 min. Together these amount to ~ 50 days. The cavitons are transient structures in the Ea…
Detection of a plasmaspheric wind in the Earth's magnetosphere by the Cluster spacecraft
Dandouras, I.
Plumes, forming at the plasmapause and released outwards, constitute a well-established mode for plasmaspheric material release to the Earth's magnetosphere. They are associated to active periods and the related electric field change. In 1992, Lemaire and Shunk proposed the existence of an additional mode for plasmaspheric material release to the …
Comparative magnetotail flapping: an overview of selected events at Earth, Jupiter and Saturn
André, N.; Jackman, C. M.; Nakamura, R. +9 more
A comparison of magnetotail flapping (the up-and-down wavy motion) between the Earth and the two giant planets Jupiter and Saturn has been performed through investigation of the current sheet normal of the magnetotail. Magnetotail flapping is commonly observed in the Earth's magnetotail. Due to single spacecraft missions at the giant planets, the …