# Wolf number

> measure of sunspots

**Wikidata**: [Q2277190](https://www.wikidata.org/wiki/Q2277190)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Sunspot_number)  
**Source**: https://4ort.xyz/entity/wolf-number


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)