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

Details EUV Full Sun Imaged Spectral Atlas Using the SOHO Coronal Diagnostic Spectrometer EUV Full Sun Imaged Spectral Atlas Using the SOHO Coronal Diagnostic Spectrometer

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.1607t&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #16.07; Bulletin of the American Astronomical Society, Vol. 31, p.850

Astronomy and Astrophysics

Astronomy

Scientific paper

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 { Angstroms} and 513-633 { Angstroms}, with a spectral resolution between 0.3 and 0.6 { Angstroms}. 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 { Angstroms} and Si XI 303.3 { Angstroms} 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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