Multiple energetic injections in a strong spike-like solar burst

Details Multiple energetic injections in a strong spike-like solar burst Multiple energetic injections in a strong spike-like solar burst

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...91..359k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 91, April 1984, p. 359-376. Research supported by the Financiadora de Estudos e Projetos.

Astronomy and Astrophysics

Astronomy

33

Energy Spectra, Microwave Emission, Solar Radio Bursts, Solar X-Rays, X Ray Astronomy, Bremsstrahlung, Fine Structure, Magnetohydrodynamics, Microwave Interferometers, Pulse Rate

Scientific paper

An intense and fast spike-like solar burst was observed with high sensitivity in microwaves and hard X-rays, on December 18, 1980, at 19h21m20s UT. It is shown that the burst was built up of short time scale structures superimposed on an underlying gradual emission, the time evolution of which showed remarkable proportionality between hard X-ray and microwave fluxes. Similarly to what has been found for mm-microwave burst emission, the authors suggest that X-ray fluxes might also be proportional to the repetition rate of basic units of energy injection (quasi-quantized). They estimate that one such injection produces a pulse of hard X-ray photons with about 4×1021erg, for ɛ ⪆ 25 keV. The authors use this figure to estimate the relevant parameters of one primary energy release site both in the case where hard X-rays are produced primarily by thick-target bremsstrahlung, and when they are purely thermal, and also discuss the relation of this figure to global energy considerations.

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