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Title: CIRCUMSOLAR ENERGETIC PARTICLE DISTRIBUTION ON 2011 NOVEMBER 3

Late on 2011 November 3, STEREO-A, STEREO-B, MESSENGER, and near-Earth spacecraft observed an energetic particle flux enhancement. Based on the analysis of in situ plasma and particle observations, their correlation with remote sensing observations, and an interplanetary transport model, we conclude that the particle increases observed at multiple locations had a common single-source active region and the energetic particles filled a very broad region around the Sun. The active region was located at the solar backside (as seen from Earth) and was the source of a large flare, a fast and wide coronal mass ejection, and an EIT wave, accompanied by type II and type III radio emission. In contrast to previous solar energetic particle events showing broad longitudinal spread, this event showed clear particle anisotropies at three widely separated observation points at 1 AU, suggesting direct particle injection close to the magnetic footpoint of each spacecraft, lasting for several hours. We discuss these observations and the possible scenarios explaining the extremely broad particle spread for this event.
Authors:
; ;  [1] ; ; ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. SRG, Universidad de Alcalá, E-28871 Alcalá de Henares (Spain)
  2. IEAP, Christian-Albrechts-Universität zu Kiel, D-24118 Kiel (Germany)
  3. The Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723 (United States)
  4. Departament d'Astronomia i Meteorologia. Institut de Ciències del Cosmos. Universitat de Barcelona, E-08028 Barcelona (Spain)
  5. IAASARS, National Observatory of Athens, GR-15236 Penteli (Greece)
Publication Date:
OSTI Identifier:
22364472
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 799; 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; ANISOTROPY; CORRELATIONS; HELIOSPHERE; MASS; PLASMA; REMOTE SENSING; SOLAR CORONA; SOLAR PARTICLES; SUN; TRANSPORT THEORY