Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..908l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 908-915.
Astronomy and Astrophysics
Astrophysics
10
Coronal Loops, Energetic Particles, Solar Flares, Gamma Ray Observatory, Magnetic Field Configurations, Magnetohydrodynamics, Plasma Control, Solar Magnetic Field, Solar Radiation, Solar X-Rays
Scientific paper
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.
Finn John M.
Lau Yun-Tung
Northrop Theodore G.
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