Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jphys..49..189s&link_type=abstract
(IAU, ESA, CNRS, et al., Colloquium on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, 102nd, Beaulieu-sur-Me
Astronomy and Astrophysics
Astrophysics
5
Abundance, Calcium, Metallicity, Noaa Satellites, Solar Flares, Solar Maximum Mission, Solar X-Rays
Scientific paper
Analysis of flare spectra obtained with the Bent Crystal Spectrometer aboard the Solar Maximum Mission (SMM) satellite enables the determination of the fluxes in the resonance (w) line of Ca XIX and the near-by continuum. The line-to-continuum intensity ratio is a sensitive measure of the calcium elemental abundance A(Ca) relative to hydrogen in the emitting plasma. In previous investigations it was found that the calcium abundance varies from flare to flare. In the present investigation, the variations of A(Ca) are analyzed for flares which occurred in two active regions well observed by SMM. It is concluded that it is not possible to correlate the abundance variations with the time of the flare occurrence as suggested in an earlier paper for flares produced from a single active region.
Bentley Robert D.
Lemen James R.
Sylwester Janusz
Zolcinski-Couet Marie C.
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