Calcium II K Spectroheliograms and Disk integrated Spectra

Details Calcium II K Spectroheliograms and Disk integrated Spectra Calcium II K Spectroheliograms and Disk integrated Spectra

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp21a01r&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SP21A-01

Physics

2162 Solar Cycle Variations (7536), 7536 Solar Activity Cycle (2162), 7537 Solar And Stellar Variability, 7538 Solar Irradiance

Scientific paper

We compare spatially resolved Calcium II K spectroheliograms and disk integrated Ca II K spectra. Both data sets are obtained at the Evans Solar Facility at the National Solar Observatory Sacramento Peak on a daily basis. An understanding of the relationship between the spatially resolved and disk integrated data can aid in interpreting spatially unresolved solar and stellar observations, solar irradiance studies in which the Ca II K line serves as a ground-based proxy for solar UV and EUV lines, and differential rotation studies of stars. We present correlations between plage parameters (area and intensity) calculated from the spectroheliograms and various spectral line parameters computed from the disk integrated spectra. We also present a preliminary comparison of rotation curves obtained from the spatially resolved data with rotation rates seen in the disk integrated data.

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