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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/31686
Title: Squeezing of particle distributions by expanding magnetic turbulence and space weather variability
Authors: D. Ruffolo
A. Seripienlert
P. Tooprakai
P. Chuychai
W. H. Matthaeus
Mahidol University
South Carolina Commission on Higher Education
Chulalongkorn University
Mae Fah Luang University
Bartol Research Institute
Keywords: Earth and Planetary Sciences;Physics and Astronomy
Issue Date: 10-Dec-2013
Citation: Astrophysical Journal. Vol.779, No.1 (2013)
Abstract: Among the space weather effects due to gradual solar storms, greatly enhanced high-energy ion fluxes contribute to radiation damage to satellites, spacecraft, and astronauts and dominate the hazards to air travelers, which motivates examination of the transport of high-energy solar ions to Earth's orbit. Ions of low kinetic energy (up to ∼2 MeV nucleon-1) from impulsive solar events exhibit abrupt changes due to filamentation of the magnetic connection from the Sun, indicating that anisotropic, field-aligned magnetic flux tubelike structures persist to Earth's orbit. By employing a corresponding spherical two-component model of Alfvénic (slab) and two-dimensional magnetic fluctuations to trace simulated trajectories in the solar wind, we show that the distribution of high-energy (E ≥ 1 GeV) protons from gradual solar events is squeezed toward magnetic flux structures with a specific polarity because of the conical shape of the flux structures. Conical flux structures and the squeezing of energetic particle distributions should occur in any astrophysical wind or jet with expanding, magnetized, turbulent plasma. This transport phenomenon contributes to event-to-event variability in ground level enhancements of GeV-range ions from solar storms, presenting a fundamental uncertainty in space weather prediction. © 2013. The American Astronomical Society. All rights reserved..
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84889034867&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/31686
ISSN: 15384357
0004637X
Appears in Collections:Scopus 2011-2015

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