Solar Chromospheric Variability from the National Solar Observatory (NSO)
Entry ID: NSO_CA2

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Summary
Abstract: Observations of the disk-integrated solar Ca II K-line are made using
the Evans Coronal Facility at The National Solar Observatory/
Sacramento Peak. A coelostat is used to feed the horizontal Littrow
spectrograph and the spectrum from 3898-3954 angstroms is recorded by
scanning the grating and digitizing the output of a photomultiplier.
About 50-150 spectral scans are made each day. From 1976-1983 data
was obtained on 10% of all days, while from 1984-present data is
obtained on about 45% of all days.

For more information see:

http://www.sunspot.noao.edu/nsosp/data/cak_mon.html

Data are also available from NOAA/NESDIS/NGDC Solar-Terrestrial
Physics Program at:
http://www.ngdc.noaa.gov/stp/stp.html
Temporal Coverage
Start Date: 1976-01-01
ISO Topic Category
Instrument
SPECTROGRAPHS Ancillary Description
Originating Center
Data Center
National Solar Observatories, Sacramento Peak Supplemental Info
Data Center URL: http://www.sunspot.noao.edu

Data Center Personnel
Name: STEPHEN L. KEIL
Phone: 505-434-7039
Fax: 505-434-7029
Email: skeil at sunspot.noao.edu
Contact Address:
National Solar Observatory
P.O. Box 62
City: Sunspot
Province or State: NM
Postal Code: 88349
Country: USA
Personnel
Role: INVESTIGATOR
Role: DIF AUTHOR
Phone: 505-434-7039
Fax: 505-434-7029
Email: skeil at sunspot.noao.edu
Contact Address:
National Solar Observatory
P.O. Box 62
City: Sunspot
Province or State: NM
Postal Code: 88349
Country: USA
Extended Metadata Properties
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Creation and Review Dates
Last DIF Revision Date: 2006-12-18
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