Search Publications
Terrestrial ion escape and relevant circulation in space
Yamauchi, Masatoshi
Observations of the terrestrial ion escape to space and the transport of escaping ions in the magnetosphere are reviewed, with the main stress on subjects that were not covered in reviews over past 2 decades, during which Cluster has significantly improved our knowledge of them. Here, outflowing ions from the ionosphere are classified in terms of …
Acceleration of protons and heavy ions to suprathermal energies during dipolarizations in the near-Earth magnetotail
Grigorenko, Elena E.; Kronberg, Elena A.; Daly, Patrick W. +2 more
In this work we present an analysis of the dynamics of suprathermal ions of different masses (H+, He+, O+) during prolonged dipolarizations in the near-Earth magnetotail (X>-17RE) according to Cluster/RAPID observations in 2001-2005. All dipolarizations from our database were associated with fast flow…
Multiscale estimation of the field-aligned current density
Vogt, Joachim; Marghitu, Octav; Bunescu, Costel +1 more
Field-aligned currents (FACs) in the magnetosphere-ionosphere (M-I) system exhibit a range of spatial and temporal scales that are linked to key dynamic coupling processes. To disentangle the scale dependence in magnetic field signatures of auroral FACs and to characterize their geometry and orientation, Bunescu et al. (2015) introduced the multis…
Wavelet analysis of the magnetotail response to solar wind fluctuations during HILDCAA events
Echer, Ezequiel; Marques de Souza Franco, Adriane; José Alves Bolzan, Mauricio
In this work a study of the effects of the high-intensity long-duration continuous AE activity (HILDCAAs) events in the magnetotail was conducted. The aim of this study was to search the main frequencies during HILDCAAs in the Bx component of the geomagnetic field in the magnetotail, as well as the main frequencies, at which the magneto…
GUMICS-4 analysis of interplanetary coronal mass ejection impact on Earth during low and typical Mach number solar winds
Pulkkinen, Tuija I.; Raukunen, Osku; Dimmock, Andrew P. +5 more
We study the response of the Earth's magnetosphere to fluctuating solar wind conditions during interplanetary coronal mass ejections (ICMEs) using the Grand Unified Magnetosphere-Ionosphere Coupling Simulation (GUMICS-4). The two ICME events occurred on 15-16 July 2012 and 29-30 April 2014. During the strong 2012 event, the solar wind upstream val…
Low-frequency magnetic variations at the high-β Earth bow shock
Petrukovich, Anatoli A.; Chugunova, Olga M.; Shustov, Pavel I.
Observations of Earth's bow shock during high-β (ratio of thermal to magnetic pressure) solar wind streams are rare. However, such shocks are ubiquitous in astrophysical plasmas. Typical solar wind parameters related to high β (here β>10) are as follows: low speed, high density, and a very low interplanetary magnetic field of 1-2 nT. These cond…
Reflection of the strahl within the foot of the Earth's bow shock
Goldstein, Melvyn L.; Gurgiolo, Christopher A.; Viñas, Adolfo
The reflection of a fraction of the solar wind at the bow shock to some extent defines the physical properties of what is known as the foreshock, the region where the interplanetary magnetic field has a direct connection to the bow shock. Both ion and electron reflection have been observed and together form a significant source of free energy that…
Strong southward and northward currents observed in the inner plasma sheet
Shen, Chao; Ji, Yong; Yang, Yan-Yan
It is generally believed that field-aligned currents (FACs) and the ring current (RC) are two dominant parts of the inner magnetosphere. However, using the Cluster spacecraft crossing the pre-midnight inner plasma sheet in the latitudinal region between 10 and 30∘ N, it is found that, during intense geomagnetic storms, in addition to FA…