Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (42) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Characteristics of hard X-ray spectra of impulsive solar flares
Authors:
Dulk, G. A.; Kiplinger, A. L.; Winglee, R. M.
Affiliation:
AA(Colorado, University, Boulder; Paris, Observatoire, Meudon, France), AB(Colorado, University; NOAA, Space Environment Laboratory, Boulder), AC(Washington, University, Seattle)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 389, April 20, 1992, p. 756-763. (ApJ Homepage)
Publication Date:
04/1992
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
GAMMA RAY BURSTS, SOLAR FLARES, SOLAR SPECTRA, SOLAR X-RAYS, CYCLOTRON RADIATION, ELECTRON DISTRIBUTION, POWER SPECTRA, SOLAR MAXIMUM MISSION
DOI:
10.1086/171248
Bibliographic Code:
1992ApJ...389..756D

Abstract

The typical characteristics of the hard X-ray emission of impulsive solar flares are examined. At times of hard X-ray peaks, spectra that break downward are the rule rather than the exception. The break energy is typically at about 100 keV and rarely exceed 150 keV. There is little or no dependence of spectral slopes or of the break energy on the hard X-ray fluxes. During the burst decay phases, there is a strong tendency for the spectra to evolve to either a single power law or to cross over to one that breaks upward. The break energy is usually lower after the crossover, but in about 30 percent of the cases it is higher. During the rise phase of many fast bursts, the rise in flux at high energies occurs later than that at lower energies. In most cases the high-energy flux catches up by the time of the burst peak and the lag is rarely or never observed in bursts whose rise time is more than about 10 s.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints