Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ucb..rept.....a&link_type=abstract
Final Report, 1 Apr. 1986 - 31 Mar. 1990 California Univ., Berkeley. Space Sciences Lab.
Astronomy and Astrophysics
Astronomy
Directivity, Gamma Rays, Photons, Solar Corona, Solar Electrons, Solar Flares, Solar X-Rays, Spaceborne Astronomy, Spatial Distribution, Stereoscopy, X Ray Fluorescence, Adiabatic Conditions, Bremsstrahlung, Chromosphere, Energetic Particles, Gamma Ray Spectrometers, International Sun Earth Explorer 3, Pioneer Venus 1 Spacecraft, X Ray Spectroscopy
Scientific paper
The objective of this grant was to measure the spatial structure and directivity of the hard X-ray and low energy gamma-ray (100 keV-2 MeV) continuum sources in solar flares using stereoscopic observations made with spectrometers aboard the Pioneer Venus Orbiter (PVO) and Third International Sun Earth Explorer (ISEE-3) spacecraft. Since the hard X-ray emission is produced by energetic electrons through the bremsstrahlung process, the observed directivity can be directly related to the 'beaming' of electrons accelerated during the flare as they propagate from the acceleration region in the corona to the chromosphere/transition region. Some models (e.g., the thick-target model) predict that most of the impulsive hard X-ray/low energy gamma-ray source is located in the chromosphere, the effective height of the X-ray source above the photosphere increasing with the decrease in the photon energy. This can be verified by determining the height-dependence of the photon source through stereoscopic observations of those flares which are partially occulted from the view of one of the two spacecraft. Thus predictions about beaming of electrons as well as their spatial distributions could be tested through the analysis proposed under this grant.
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