Impulsive phase Fe K-alpha emission in a flare of 1989 March

Details Impulsive phase Fe K-alpha emission in a flare of 1989 March Impulsive phase Fe K-alpha emission in a flare of 1989 March

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..865z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 2, June 1, 1992, p. 865-871. Research supported by Lockheed Corp.

Astronomy and Astrophysics

Astronomy

11

Iron, K Lines, Solar Flares, Solar X-Rays, Thermal Radiation, Bremsstrahlung, Gamma Ray Astronomy, Photoexcitation, Solar Maximum Mission, Solar Radio Bursts

Scientific paper

Evidence for enhanced Fe K-alpha line emission that is coincident (to within 15 s) of an intense hard X-ray (greater than 50 keV) burst is presented on the basis of observations of the Fe K-alpha soft X-ray line made with the SMM. Three different models for explaining the K-alpha enhancement are investigated, namely, photoexcitation by soft X-ray thermal bremsstrahlung radiation from an isothermal source, collisional excitation by nonthermal thick-target electrons, and photoexcitation by a nonthermal hard X-ray flux distribution which extends with a power-law spectrum down to the Fe K-alpha ionization threshold at 7.1 keV. It is found that, to within the limits of isothermal temperature and emission measure set by soft X-ray observations, the thermal photoexcitation model cannot reproduce satisfactorily the intensity of enhanced K-alpha emission during the hard X-ray impulsive phase. The impulsive phase K-alpha flux exceeds that predicted by the thermal photoexcitation model by about 3 sigma. The implications of these results for the nonthermal interpretation of impulsive hard X-ray bursts in solar flares are discussed.

Affiliated with

Also associated with

No associations

Rating

Impulsive phase Fe K-alpha emission in a flare of 1989 March 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 Impulsive phase Fe K-alpha emission in a flare of 1989 March, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impulsive phase Fe K-alpha emission in a flare of 1989 March will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1199892