Oscillations of coronal electron traps inferred from hard X-ray data

Details Oscillations of coronal electron traps inferred from hard X-ray data Oscillations of coronal electron traps inferred from hard X-ray data

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49..329b&link_type=abstract

Solar Physics, vol. 49, Aug. 1976, p. 329-342.

Physics

8

Electron Flux Density, Magnetically Trapped Particles, Solar Corona, Solar Magnetic Field, Solar Radio Bursts, X Ray Spectra, Betatrons, European Space Agency, Particle Acceleration, Solar Spectra, Time Dependence

Scientific paper

The work of Brown and Hoyng (1975) on betatron acceleration of hard X-ray source electrons trapped in a vibrating flux tube is generalized to include Fermi acceleration by the varying transverse field. This development can explain the trajectory of bursts in a plot of equivalent thick-target electron flux (F) versus spectral index (gamma), as inferred from observations obtained by ESRO TD1A. Specifically the loops observed in this (F, gamma) diagram, unexplained in Brown and Hoyng's analysis, are accounted for by a changing phase relationship between the varying field strength and magnetic scale length. Application of the formalism to detailed TD1A observations of the large events of August 4 and 7, 1972, allows inference of the evolution of field strength and scale length in these events.

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