A High-Resolution Solar Spectrum in the EUVE Bandpass

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The Solar EUV Rocket Telescope and Spectrograph (SERTS) obtains imaged spectra of solar features with resolution around 0.04 Angstroms and high sensitivity. Its spectral range of 170 -- 450 Angstroms overlaps large portions of the Medium Wavelength and Long Wavelength Spectrographs on EUVE, and so may provide help in interpreting the lower resolution EUVE spectra of late-type stellar sources. As an example, we compare SERTS observations averaged over a typical solar active region with EUVE calibration spectra of Capella, a G6 + G2 binary. The Capella spectra include prominent spectral features at 256.5, 284.7, 304.2, 335.4, and 360.3 Angstroms. The SERTS spectrum indicates that, although these features are generally dominated by a single emission line, they may also be contaminated to some degree by blends of other lines at the resolutions of the EUVE spectrographs, which are approximately 1.0 and 2.0 Angstroms. This high-resolution solar active region spectrum from SERTS is now available electronically by request to thomas@jet.gsfc.nasa.gov, as are emission line catalogs derived from it. This work was supported under NASA RTOP 170-38-52.

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