Solar X-ray spectrum simulations for flaring loop models with emphasis on transient ionization effects during the impulsive phase

Details Solar X-ray spectrum simulations for flaring loop models with emphasis on transient ionization effects during the impulsive phase Solar X-ray spectrum simulations for flaring loop models with emphasis on transient ionization effects during the impulsive phase

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152..229m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 2, Nov. 1985, p. 229-236. SERC-Navy-CNR-supported research.

Physics

34

Coronal Loops, Ionization, Magnetohydrodynamics, Solar Flares, Solar X-Rays, X Ray Spectra, Astronomical Spectroscopy, Calcium, Plasmas (Physics), Stellar Models

Scientific paper

X-ray spectra are simulated for observations with the Bent Crystal Spectrometer (BCS) on the Solar Maximum Mission (SMM) spacecraft (around 1.9 A and 3 A) using results of a time-dependent numerical code for a dynamic flaring loop model. The spectra are integrated over the whole loop and fully take into account the effects of deviations from ionization equilibrium and Doppler shifts resulting from plasma movements. The effect of transient ionization on the spectra emitted during the initial impulsive phase is emphasized. In all the cases considered a strong depletion (relative to the continuum) of high-ionization spectral lines takes place during about the first minute of the flare for electron densities below about 10 to the 11th/cu cm. A preliminary comparison to observations made with the BCS show some indications for such effects in a few strong flares, but more sensitive instruments will be needed in the future to exploit such transient ionization effects as a possible valid density diagnostic for hot solar flares.

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