A new perspective on the sun from SOHO-challenges for atomic physics

Details A new perspective on the sun from SOHO-challenges for atomic physics A new perspective on the sun from SOHO-challenges for atomic physics

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..434..213d&link_type=abstract

The first international conference on atomic and molecular data and their standards. AIP Conference Proceedings, Volume 434, pp

Other

Particle Emission, Solar Wind, Atomic Spectra, Solar Instruments

Scientific paper

The Solar and Heliospheric Observatory (SOHO) carries several ultraviolet spectrometers to diagnose the plasma conditions of the solar atmosphere in order to address several outstanding questions in solar research: why is the corona hot and how is the solar wind accelerated. Diagnostic techniques for determining the magnetohydrodynamic state (magnetic field, density, temperature, velocity) are discussed. We describe the CHIANTI database which has been designed to provide the necessary spectroscopic diagnostics for these data as well as for other spectroscopic missions. The database is built on 3 main files for each ion: atomic energy levels, radiative data, and electron collisional data. The electron collision strengths are assessed and scaled using the Burgess and Tully scaling laws. Analyses of EUV line intensities often reveal discrepancies between observed and predicted line intensities of about of 2 when considering lines of the same ion. A more recent analysis has shown that it is possible to arrive at a subset of EUV spectral lines where the line intensities are reproducible to within about 25%. For X-ray lines, as will be observed by AXAF, there is still considerable need for energy levels, radiative data and collision strengths, particularly for the Δn>=1 transitions.

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