On the Ability of an Extreme-Ultraviolet Multilayer Normal-Incidence Telescope to Provide Temperature Information for Solar Plasmas

Details On the Ability of an Extreme-Ultraviolet Multilayer Normal-Incidence Telescope to Provide Temperature Information for Solar Plasmas On the Ability of an Extreme-Ultraviolet Multilayer Normal-Incidence Telescope to Provide Temperature Information for Solar Plasmas

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...511l..61f&link_type=abstract

The Astrophysical Journal, Volume 511, Issue 1, pp. L61-L64.

Astronomy and Astrophysics

Astronomy

13

Sun: Atmosphere, Sun: Flares, Telescopes

Scientific paper

In recent years, multilayer-coated optics have been used in solar-soft X-ray and extreme-ultraviolet telescopes to record high-resolution, full Sun images. The multilayer coatings reflect efficiently over rather narrow wavelength bands that are selected to contain spectral emission lines considered to have plasma diagnostic importance for determining approximate electron temperatures. The purpose of this Letter is to discuss the effect of continuum emission on the response of multilayer passbands and the effect of this response on temperature determinations in the 4x10^6-2x10^7 K range. Significant effects are largely confined to continuum emission from flare plasma. The flare free-free continuum in the EUV range is nearly temperature and wavelength insensitive and dominates the emission in passbands that are centered on quiet- to active-Sun coronal lines emitted by ions such as Fe IX-Fe XV.

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