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Re-Acceleration of Energetic Particles in Large-Scale Heliospheric Magnetic Cavities

Published online by Cambridge University Press:  24 July 2018

Olga V. Khabarova Open the ORCID record for Olga V. Khabarova [Opens in a new window] ,
Olga E. Malandraki ,
Gary P. Zank ,
Gang Li ,
Jakobus A. le Roux  and
Gary M. Webb
Olga V. Khabarova
Affiliation:
Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of RAS (IZMIRAN), Moscow, Russia, email: [email protected]
Olga E. Malandraki
Affiliation:
IAASARS, National Observatory of Athens, Penteli, Greece, email: [email protected]
Gary P. Zank
Affiliation:
Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, AL, USA Department of Space Science, University of Alabama in Huntsville, AL, USA
Gang Li
Affiliation:
Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, AL, USA Department of Space Science, University of Alabama in Huntsville, AL, USA
Jakobus A. le Roux
Affiliation:
Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, AL, USA Department of Space Science, University of Alabama in Huntsville, AL, USA
Gary M. Webb
Affiliation:
Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, AL, USA
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Abstract

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Case studies show that some energetic particle flux enhancements up to MeV/nuc. observed at 1 AU cannot be treated as a consequence of particle acceleration at shocks or during flares. Atypical energetic particle events (AEPEs) are often detected during crossings of magnetic cavities formed by strong current sheets of various origins in the solar wind. Such cavities confine small-scale magnetic islands (SMIs) produced by magnetic reconnection. SMIs, in turn, trap and re-accelerate energetic particles according to predictions based on the theory of Zank et al. describing stochastic particle energization in the supersonic solar wind via numerous dynamically interacting SMIs. AEPEs possess energies that overlap SEP events and can be an important component in understanding space weather.

Keywords

Solar windparticle accelerationmagnetic islandscurrent sheets
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 75 - 81
Copyright
Copyright © International Astronomical Union 2018 

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