Backscatter of hard x-rays in the solar atmosphere

Technical Report · Sat Jan 01 04:00:00 EST 1977

OSTI ID:7316399

Bai, T; Ramaty, R

The solar photosphere backscatters a substantial fraction of the hard X rays from solar flares incident upon it. This reflection was studied using a Monte Carlo simulation which takes into account Compton scattering and photo-electric absorption. Both isotropic and anisotropic X ray sources are considered. The bremsstrahlung from an anisotropic distribution of electrons is evaluated. By taking the reflection into account, the inconsistency is removed between recent observational data regarding the center-to-limb variation of solar X ray emission and the predictions of models in which accelerated electrons are moving down toward the photosphere.

• Research Organization: National Aeronautics and Space Administration, Greenbelt, MD (USA). Goddard Space Flight Center
• OSTI ID: 7316399
• Report Number(s): N-77-18984; NASA-TM-X-71269; X-660-77-21
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BACKSCATTERING
BASIC INTERACTIONS
BREMSSTRAHLUNG
COMPTON EFFECT
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
HARD X RADIATION
INTERACTIONS
IONIZING RADIATIONS
MONTE CARLO METHOD
PHOTOELECTRIC EFFECT
PHOTOSPHERE
RADIATIONS
SCATTERING
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR FLARES
STARS
SUN
X RADIATION