Solar records: the Wolf sunspot index and umbral/penumbral ratio
Technical Report
·
OSTI ID:6834487
Annual Wolf sunspot numbers and umbral/penumbral (U/P) ratios are given for the period 1875-1981. The data are summarized from daily values and are as accurate a reconstruction as can be presently made.
- Research Organization:
- National Oceanic and Atmospheric Administration, Boulder, CO (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6834487
- Report Number(s):
- NDP-014
- Country of Publication:
- United States
- Language:
- English
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