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Title: Squeezing of particle distributions by expanding magnetic turbulence and space weather variability

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{sup –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.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Department of Physics, Faculty of Science, Mahidol University, Bangkok 10400 (Thailand)
  2. Thailand Center of Excellence in Physics, CHE, Ministry of Education, Bangkok 10400 (Thailand)
  3. Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States)
Publication Date:
OSTI Identifier:
22348494
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALFVEN WAVES; ANISOTROPY; ASTROPHYSICS; FLUCTUATIONS; GALAXIES; GEV RANGE; MAGNETIC FIELDS; MAGNETIC FLUX; MEV RANGE; ORBITS; PROTONS; RADIATION EFFECTS; SATELLITES; SIMULATION; SOLAR WIND; SPACE; SPHERICAL CONFIGURATION; SUN; TRAJECTORIES; TURBULENCE