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Title: Diamagnetic reduction in the magnetic field above a sunspot in the gamma-ray burst on July 14, 2000

Earlier, the authors proposed a model for describing the motion of trapped ions accelerated to energies of 10–100 MeV/nucleon in an electric field of 0.01–0.1 V/cm with a nonzero magnetic-field-aligned component in coronal solar loops with a characteristic size of ∼100 000 km. The simulation results were used to interpret the properties of gamma-ray sources in a powerful solar burst that occurred on July 14, 2000. According to the proposed model, the gamma-ray source emitting lines with photon energies of 4.1–6.7 MeV was located above the sunspot and the source of the 2.223-MeV line coincided with the region of the observed drop-out of accelerated ions into dense layers of the solar atmosphere in the sunspot, where a short-term reduction in the photospheric magnetic field by about 100 G was simultaneously observed. An idea is stated and justified for the first time that the local reduction in the magnetic field in the sunspot is caused by the diamagnetic effect created by accelerated ions in the magnetic mirror of the coronal magnetic flux rope above the sunspot.
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. Russian Academy of Sciences, Institute of Solar–Terrestrial Physics, Siberian Branch (Russian Federation)
  2. Russian Academy of Sciences, Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation (Russian Federation)
  3. Astronomic Observatory of Irkutsk State University (Russian Federation)
Publication Date:
OSTI Identifier:
22472207
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 8; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMIC GAMMA BURSTS; COSMIC GAMMA SOURCES; ELECTRIC FIELDS; INTERPLANETARY MAGNETIC FIELDS; IONS; LAYERS; MAGNETIC FLUX; MEV RANGE; NUCLEONS; SOLAR CORONA; SUNSPOTS; TRAPPING