Long-term containment of energetic particles in coronal loops
1993; IOP Publishing; Volume: 414; Linguagem: Inglês
10.1086/173134
ISSN1538-4357
AutoresYun-Tung Lau, T. G. Northrop, John M. Finn,
Tópico(s)Ionosphere and magnetosphere dynamics
Resumoview Abstract Citations (14) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Long-Term Containment of Energetic Particles in Coronal Loops Lau, Yun-Tung ; Northrop, Theodore G. ; Finn, John M. Abstract Recent observation from the Compton Gamma-Ray Observatory shows that gamma-ray emission after a solar flare can last for as long as 8 hours. There is also evidence that electrons and protons are accelerated only during the impulsive phase of the flare and are subsequently mirror trapped in coronal magnetic loops. This poses the following dilemma: if the magnetic field lines in the loop are simple plane arches, the protons will drift across the cross section of the loop in seconds to minutes, rather than hours. To solve the dilemma, we use guiding center theory to show that long-term containment of energetic protons in a coronal loop is possible if magnetic field lines have enough twist. We also find that in the trapped region of the loop, the twist angle of field lines between the mirror points of a bounce orbit is approximately 2 pi. Publication: The Astrophysical Journal Pub Date: September 1993 DOI: 10.1086/173134 Bibcode: 1993ApJ...414..908L Keywords: Coronal Loops; Energetic Particles; Solar Flares; Gamma Ray Observatory; Magnetic Field Configurations; Magnetohydrodynamics; Plasma Control; Solar Magnetic Field; Solar Radiation; Solar X-Rays; Solar Physics; SUN: FLARES; SUN: CORONA; MAGNETOHYDRODYNAMICS: MHD; SUN: X-RAYS; GAMMA RAYS full text sources ADS |
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