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Title: Observations of energetic particles between a pair of corotating interaction regions

We report observations of the acceleration and trapping of energetic ions and electrons between a pair of corotating interaction regions (CIRs). The event occurred in Carrington Rotation 2060. Observed by the STEREO-B spacecraft, the two CIRs were separated by less than 5 days. In contrast to other CIR events, the fluxes of the energetic ions and electrons in this event reached their maxima between the trailing edge of the first CIR and the leading edge of the second CIR. The radial magnetic field (B{sub r} ) reversed its sense and the anisotropy of the flux also changed from Sunward to anti-Sunward between the two CIRs. Furthermore, there was an extended period of counterstreaming suprathermal electrons between the two CIRs. Similar observations for this event were also obtained with the Advanced Composition Explorer and STEREO-A. We conjecture that these observations were due to a U-shaped, large-scale magnetic field topology connecting the reverse shock of the first CIR and the forward shock of the second CIR. Such a disconnected U-shaped magnetic field topology may have formed due to magnetic reconnection in the upper corona.
Authors:
; ;  [1] ; ;  [2] ; ;  [3] ;  [4] ; ;  [5] ; ;  [6] ;  [7] ;  [8]
  1. Institute of Space Sciences and School of Space Science and Physics, Shandong University at Weihai, Weihai 264209 (China)
  2. Department of Space Science and CSPAR, University of Alabama in Huntsville, AL 35899 (United States)
  3. Southwest Research Institute, San Antonio, TX 78228 (United States)
  4. Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723 (United States)
  5. Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse (UPS) and Centre National de la Recherche Scientifique, UMR 5277, Toulouse (France)
  6. Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, MI 48105 (United States)
  7. State Key Laboratory of Space Weather, National Space Science Center, CAS. Beijing 100190 (China)
  8. Theoretical Division, Los Alamos National Laboratory, NM 87545 (United States)
Publication Date:
OSTI Identifier:
22348189
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 781; 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; ACCELERATION; ANISOTROPY; ELECTRONS; FASTENING; INTERACTIONS; MAGNETIC FIELDS; MAGNETIC RECONNECTION; MAGNETOHYDRODYNAMICS; ROTATION; SHOCK WAVES; SOLAR WIND; SUN; TAIL IONS; TOPOLOGY; TRAPPING