Gyro-synchrotron modulation in the moving type IV bursts

Details Gyro-synchrotron modulation in the moving type IV bursts Gyro-synchrotron modulation in the moving type IV bursts

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....79..164t&link_type=abstract

Astronomy and Astrophysics, vol. 79, no. 1-2, Oct. 1979, p. 164-168.

Astronomy and Astrophysics

Astronomy

16

Energetic Particles, Magnetically Trapped Particles, Radio Spectra, Solar Spectra, Synchrotron Radiation, Type 4 Bursts, Arches, Electron Energy, Energy Distribution, Plasma Oscillations, Radio Astronomy, Spectroheliographs

Scientific paper

Three successive moving type IV bursts were observed in association with an eruptive prominence on April 12, 1977. The radiation which is attributed to the gyrosynchrotron emission from energetic electrons trapped in an expanding magnetic arch exhibits an important modulation on a time scale of about one minute. The modulation takes predominantly its origin in two components which are assumed to be the mirror points of the expanding arch where the electrons are trapped. The possibility that synchrotron radiation near the mirror points is modulated by a mere MHD oscillation of the arch is investigated. A second kind of explanation is proposed which involves a quasiperiodic downward precipitation of particles.

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