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

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Abstract

The work of Brown and Hoyng (1975) on the betatron acceleration of hard X-ray source electrons trapped in a vibrating flux tube is generalised 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 \(\mathfrak{F}\) versus spectral index γ as inferred from observations obtained by ESRO TD1A. Specifically the loops observed in this \(\mathfrak{F}\), λ diagram, unexplained in Brown and Hoyng's anslysis are accounted for by a changing phase relationship between the varying field strength f(t) and magnetic scale length g(t)- Application of the formalism to the detailed TD1A observations of the large events of 1972, August 4 and 7, allows inference of the evolution of f(t), g(t) in these events.

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Authors and Affiliations

  1. Department of Astronomy, University of Glasgow, Gl2 8QQ, Glasgow, Scotland

    J. C. Brown & A. N. McClymont

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  1. J. C. Brown
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  2. A. N. McClymont
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Now at: Space Sciences Laboratory, University of California, Berkeley, U.S.A.

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Brown, J.C., McClymont, A.N. Oscillations of coronal electron traps inferred from hard X-ray data. Sol Phys 49, 329–342 (1976). https://doi.org/10.1007/BF00162456

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  • DOI: https://doi.org/10.1007/BF00162456

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