High-resolution X-ray spectra of solar flares. III - General spectral properties of X1-X5 type flares

Details High-resolution X-ray spectra of solar flares. III - General spectral properties of X1-X5 type flares High-resolution X-ray spectra of solar flares. III - General spectral properties of X1-X5 type flares

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..725d&link_type=abstract

Astrophysical Journal, Part 1, vol. 239, July 15, 1980, p. 725-737. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

135

Solar Flares, Solar Spectra, Solar Wind, Solar X-Rays, X Ray Spectra, Abundance, High Resolution, Line Spectra, Plasma Diagnostics, Spectrometers

Scientific paper

High-resolution X-ray spectra of six class X1-X5 solar flares are discussed. The spectra were recorded by spaceborne Bragg crystal spectrometers in the ranges 1.82-1.97, 2.98-3.07 and 3.14-3.24 A. Electron temperatures derived from dielectronic satellite line to resonance line ratios for Fe XXV and Ca XIX are found to remain fairly constant around 22,000,000 and 16,000,000 K respectively during the rise phase of the flares, then decrease by approximately 6,000,000 K during the decay phase. Nonthermal motions derived from line widths for the April 27, 1979 event are found to be greatest during the rise phase (approximately 130 km/sec) and decrease to about 60 km/sec during decay. Volume emission measures for Fe XXV, Ca XIX and Ca XX are derived from photon fluxes as a function of temperature, and examination of the intensity behavior of the Fe K alpha emission as a function of time indicates that it is a result of fluorescence. Differences between the present and previous observations of temperature variation are discussed, and it is concluded that the flare plasmas are close to ionization equilibrium for the flares investigated.

Affiliated with

Also associated with

No associations

Rating

High-resolution X-ray spectra of solar flares. III - General spectral properties of X1-X5 type flares does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with High-resolution X-ray spectra of solar flares. III - General spectral properties of X1-X5 type flares, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-resolution X-ray spectra of solar flares. III - General spectral properties of X1-X5 type flares will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-803476