Spatial and temporal structures of impulsive bursts from solar flares observed in UV and hard x-rays

Journal Article · Sat Aug 15 04:00:00 EDT 1981 · Astrophys. J., Lett. Ed.; (United States)

DOI:https://doi.org/10.1086/183619· OSTI ID:5973634

Cheng, C; Tandberg-Hanssen, E; Bruner, E C; Orwig, L; Frost, K J; Kenny, P J; Woodgate, B E; Shine, R A

We present new observations of impulsive UV and hard X-rays bursts in two solar flares obtained with instruments on Solar Maximum Mission. The UV bursts were observed in the Si IV and O IV emission lines, whose intensity ratio is density-sensitive. By comparing the spatially resolved Si IV/O IV observations with the corresponding hard X-ray observations, we are able to study their spatial and temporal relationships. For one flare, the individual component spikes in the multiply peaked hard X-ray burst can be identified with different discrete Si IV/O IV flaring kernels of size 4'' x 4'' or smaller, which brighten up sequentially in time. For the other, many Si IV/O IV kernels, widely distributed over a large area, show impulsive bursts at the same time, which correlate with the main peak of the impulsive hard X-ray burst. The density of the flaring Si IV/O IV kernals is in the range from 5 x 10/sup 12/ to 10/sup 13/ cm/sup -3/.

• Research Organization: NASA Marshall Space Flight Center
• OSTI ID: 5973634
• Journal Information: Astrophys. J., Lett. Ed.; (United States), Journal Name: Astrophys. J., Lett. Ed.; (United States) Vol. 248:1; ISSN AJLEA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGED PARTICLES
DATA
ELECTROMAGNETIC RADIATION
EMISSION
EXPERIMENTAL DATA
HARD X RADIATION
INFORMATION
IONIZING RADIATIONS
IONS
NUMERICAL DATA
OXYGEN IONS
RADIATIONS
SILICON IONS
SOLAR ACTIVITY
SOLAR FLARES
SOLAR X-RAY BURSTS
SPECTRA
ULTRAVIOLET SPECTRA
X RADIATION
X-RAY SPECTRA