Evidence for inhomogeneous thermal sources of two similar solar spike events of 1978 May 5 and December 4

Details Evidence for inhomogeneous thermal sources of two similar solar spike events of 1978 May 5 and December 4 Evidence for inhomogeneous thermal sources of two similar solar spike events of 1978 May 5 and December 4

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..256w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 256-264. Research supported by the Swiss National Sci

Computer Science

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2

Astronomical Spectroscopy, Emission Spectra, Microwave Emission, Solar Flares, Solar X-Rays, Bearing (Direction), Helios 2, Inhomogeneity, Microwave Antennas, Spectroheliographs

Scientific paper

Two short duration single spike solar events of 1978 May 5 and December 4 exhibit similar time profiles in the microwave and hard X-ray ranges, indicating emission from compact sources. Microwave spectral observations exhibit inhomogeneities present in the source parameters. The existence of fine time structures in the microwave time profiles at 10.4 GHz from Berne are interpreted as a signature of the dynamics of a disturbance traveling through the source at the ion-sound speed. Stereoscopic observations with the hard X-ray detector on the solar orbiter, Helios-2, and the Berne microwave antenna do not indicate any time lag or differences in the time profiles during the impulsive phase. This is taken as evidence for the absence of directionality of emission making beam models unlikely for short duration single spike events. Previously announced in STAR as N83-13047

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