AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 16. Solar Corona
Display, Monday, May 31, 1999, 9:20am-6:30pm, Southeast Exhibit Hall

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[16.07] EUV Full Sun Imaged Spectral Atlas Using the SOHO Coronal Diagnostic Spectrometer

W. T. Thompson (SM\&A Corporation/NASA Goddard Space Flight Center), P. Brekke (Institute of Theoretical Astrophysics, Univ. of Oslo)

The Coronal Diagnostic Spectrometer (CDS) aboard the Solar and Heliospheric Observatory (SOHO) carries out a regular program of measuring the full-disk irradiance using the Normal Incidence Spectrograph (NIS). The full-disk solar spectrum is returned in the wavelength bands 308--379~{Å} and 513--633~{Å}, with a spectral resolution between 0.3 and 0.6~{Å}. A recent modification to the CDS on-board software allows simultaneous moderate resolution monochromatic images to be made of the stronger lines in these wavelength ranges. We report on observations made 23~April 1998, 21~May 1998, and 22~June 1998. A total of 69 monochromatic full-sun images are extracted from the spectral line data. For the first time, spectrally resolved images of the full Sun in He~II 303.8~{Å} and Si~XI 303.3~{Å} are presented and compared. Velocity maps of the Sun in neutral and singly ionized helium are presented. Correlations of intensity to velocity over a wide range of transition region and coronal temperatures are shown. Velocity maps of Mg~IX and~X are presented.

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