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Title: Multi-spacecraft observations of recurrent {sup 3}He-rich solar energetic particles

We study the origin of {sup 3}He-rich solar energetic particles (<1 MeV nucleon{sup –1}) that are observed consecutively on STEREO-B, Advanced Composition Explorer (ACE), and STEREO-A spacecraft when they are separated in heliolongitude by more than 90°. The {sup 3}He-rich period on STEREO-B and STEREO-A commences on 2011 July 1 and 2011 July 16, respectively. The ACE {sup 3}He-rich period consists of two sub-events starting on 2011 July 7 and 2011 July 9. We associate the STEREO-B July 1 and ACE July 7 {sup 3}He-rich events with the same sizeable active region (AR) producing X-ray flares accompanied by prompt electron events, when it was near the west solar limb as seen from the respective spacecraft. The ACE July 9 and STEREO-A July 16 events were dispersionless with enormous {sup 3}He enrichment, lacking solar energetic electrons and occurring in corotating interaction regions. We associate these events with a small, recently emerged AR near the border of a low-latitude coronal hole that produced numerous jet-like emissions temporally correlated with type III radio bursts. For the first time we present observations of (1) solar regions with long-lasting conditions for {sup 3}He acceleration and (2) solar energetic {sup 3}He that is temporarily confined/re-accelerated inmore » interplanetary space.« less
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Max-Planck-Institut für Sonnensystemforschung, D-37077 Göttingen (Germany)
  2. Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723 (United States)
  3. Space Research Group, University of Alcalá, E-28871 Alcalá de Henares (Spain)
Publication Date:
OSTI Identifier:
22357004
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 786; 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; EMISSION; ENRICHMENT; HELIUM 3; INTERACTIONS; INTERPLANETARY SPACE; NUCLEONS; PROMPT ELECTRONS; SOLAR PARTICLES; SOLAR WIND; SUN; TAIL ELECTRONS; X RADIATION