Radio evidence for a magnetic mirror effect on beams of subrelativistic electrons in the solar corona

Details Radio evidence for a magnetic mirror effect on beams of subrelativistic electrons in the solar corona Radio evidence for a magnetic mirror effect on beams of subrelativistic electrons in the solar corona

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...319..503c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 319, Aug. 1, 1987, p. 503-513.

Astronomy and Astrophysics

Astrophysics

20

Electron Beams, High Energy Electrons, Magnetic Mirrors, Solar Corona, Solar Magnetic Field, Solar Radio Bursts, Magnetic Field Configurations, Radio Spectra, Solar Spectra, Temporal Distribution

Scientific paper

New radio spectral observations of the sun are presented which reveal a magnetic mirror effect on impulsively injected beams of subrelativistic electrons in coronal arch structures. A third branch following the descending branch of some U-bursts was detected, called 'N-bursts'. A detailed analysis of the digital time profiles shows that the duration of the beam emission regularly increased with time along the three successive branches of the N-bursts. This duration is interpreted as the dispersion of the beam along its path. This continuity strongly suggests that the three successive branches were produced by the same electron beam, demonstrating that the N-bursts actually trace reflections on magnetic mirrors near the feet of magnetic arches. Nineteen N-bursts were analyzed in detail. The information thus obtained allows a detailed probing of the magnetic mirror effect on beams of subrelativistic electrons in astrophysical conditions.

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