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Acceleration of solar wind ions to 1 MeV by electromagnetic structures upstream of the Earth's bow shock
KTH, School of Computer Science and Communication (CSC), High Performance Computing and Visualization (HPCViz).ORCID iD: 0000-0003-0639-0639
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2013 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 102, no 4, 49001- p.Article in journal (Refereed) Published
Abstract [en]

We present measurements from the ESA/NASA Cluster mission that show in situ acceleration of ions to energies of 1MeV outside the bow shock. The observed heating can be associated with the presence of electromagnetic structures with strong spatial gradients of the electric field that lead to ion gyro-phase breaking and to the onset of chaos in ion trajectories. It results in rapid, stochastic acceleration of ions in the direction perpendicular to the ambient magnetic field. The electric potential of the structures can be compared to a field of moguls on a ski slope, capable of accelerating and ejecting the fast running skiers out of piste. This mechanism may represent the universal mechanism for perpendicular acceleration and heating of ions in the magnetosphere, the solar corona and in astrophysical plasmas. This is also a basic mechanism that can limit steepening of nonlinear electromagnetic structures at shocks and foreshocks in collisionless plasmas.

Place, publisher, year, edition, pages
2013. Vol. 102, no 4, 49001- p.
Keyword [en]
Corotating Interaction Regions, Space Plasmas, Particle-Acceleration, Energetic Particles, Cluster, Waves, Field, Magnetosphere, Consequences, Heliosphere
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-125766DOI: 10.1209/0295-5075/102/49001ISI: 000321118600040ScopusID: 2-s2.0-84880518602OAI: diva2:640638

QC 20130814

Available from: 2013-08-14 Created: 2013-08-13 Last updated: 2013-08-14Bibliographically approved

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Markidis, Stefano
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