The coevolution of decimetric millisecond spikes and hard X-ray emission during solar flares

Details The coevolution of decimetric millisecond spikes and hard X-ray emission during solar flares The coevolution of decimetric millisecond spikes and hard X-ray emission during solar flares

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..736a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 2, p. 736-753.

Astronomy and Astrophysics

Astrophysics

67

Decimeter Waves, Solar Flares, Solar Radio Bursts, Solar X-Rays, X Ray Spectra, Gamma Rays, Magnetohydrodynamic Stability, Shock Waves, Solar Maximum Mission, Trapped Particles, Wave Propagation

Scientific paper

Results are presented of an analysis of a comprehensive data set of 27 solar flares with decimetric millisecond spikes between 1980 and 1989, simultaneously observed with the Zuerich radio spectrometers and the Hard X-ray Burst Spectrometer on the SMM spacecraft. Two contradictory relationships of the coevolution of hard X-ray and spiky radio emissions during flares are found: the temporal evolution of both emissions reveals a close functional dependence, but there is a substantial time delay between the two emissions. Five possible scenarios for the hard-X-ray-associated radio spike emission which may account for both their detailed coevolution and their substantial intervening time delay are discussed. All five scenarios are able to explain both the close coevolution of hard X-ray and radio emission as well as their mutual delay to some degree, but none of them can explain all observational aspects in a simple way.

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