Observations of the disk-integrated solar Ca II K-line are made using the Evans Coronal Facility at The National Solar Observatory/Sacramento Peak. About 50-150 spectral scans are made each day, with data obtained on 10% of days from 1976-1983 and about 45% of days from 1984 to present.
Use Cases
- Analyze solar chromospheric activity based on Ca II K-line observations.
- Study long-term solar variability patterns based on daily spectral scans.
- Model solar spectral emissions based on data from the Littrow spectrograph.
- Correlate solar activity with terrestrial phenomena based on decades of observations.
Strengths
- Data spans from 1976 to the present, providing a long-term record.
- Daily observations include about 50-150 spectral scans.
- Data coverage increased from 10% of days to about 45% of days after 1983.
Limitations
- Column-level documentation is absent; field semantics must be inferred after download.
- Row count is unknown, which may limit suitability assessment.
- Data may reflect temporal bias inherent to nasa_earthdata.
Provenance
- Source
- National Solar Observatory/Sacramento Peak
- Collection Method
- Observations made using the Evans Coronal Facility and a horizontal Littrow spectrograph.
- Time Range
- 1976 to present