Synoptic observations with the Coimbra spectroheliograph

Details Synoptic observations with the Coimbra spectroheliograph Synoptic observations with the Coimbra spectroheliograph

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011coska..41...69g&link_type=abstract

Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 41, no. 2, p. 69-72.

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Sun: Activity, Sun: Chromosphere

Scientific paper

Spectroheliograms in the Astronomical Observatory of the Coimbra University (Portugal) have been photographed in the spectral line of Ca II K continuously since 1926 and, since 1989, spectroheliograms in Hα have been photographed as well. Since 2007, all the spectroheliograms have been recorded using a CCD camera. Until July 2010, about 34 000 observations in total were acquired in the spectral bands Ca II K3, Ca II K1, Hα, red continuum, and Hα Dopplergrams (since 2009), covering a period of 85 years (Ca II K3 line). We describe the characteristics of the photographic and digital spectroheliograms, the statistics of the observations, and the utilization of Coimbra spectroheliograms by the solar community.

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