Spatial structure of > or approx. = 100 keV x-ray sources in solar flares

Journal Article · Mon Mar 15 04:00:00 EST 1982 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/183755· OSTI ID:5169985

Kane, S R; Fenimore, E E; Klebesadel, R W; Laros, J G

Steroscopic X-ray observations of the 1979 November 5 solar flares permitted the first measurements of the altitude structure of the impulsive and gradual sources of > or approx. = 100 keV X-rays. It is found that the brightness of the impulsive as well as the gradual hard X-ray sources decreases rapidly with increase in altitude above the photosphere. Most of the X-ray emission seems to originate at altitudes < or approx. =2500 km, indicating the models of hard X-ray sources with low (< or approx. =10/sup 10/ cm/sup -3/) ion density are not consistent with the observations.

• Research Organization: Space Sciences Laboratory, University of California, Berkeley
• OSTI ID: 5169985
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 254:2; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics &amp; Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
ELECTROMAGNETIC RADIATION
EMISSION
IONIZING RADIATIONS
MEASURING INSTRUMENTS
RADIATIONS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR FLARES
SOLAR X-RAY BURSTS
SPECTRA
SPECTROMETERS
X RADIATION
X-RAY SPECTRA
X-RAY SPECTROMETERS