| Title | Sunspots |
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| Author | Boteler, D H |
| Source | Encyclopedia of natural hazards; by Bowbrowski, P T (ed.); Encyclopedia of Earth Sciences Series vol. 41, 2013 p. 986, https://doi.org/10.1007/978-1-4020-4399-4 337 |
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| Year | 2013 |
| Alt Series | Earth Sciences Sector, Contribution Series 20120149 |
| Publisher | Springer Netherlands |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | geophysics; extraterrestrial geology; solar energy; solar variations; geomagnetism; geomagnetic fields; geomagnetic variations; magnetic disturbances; magnetic storms |
| Program | Public Safety Geoscience Targeted Hazard Assessments in Northern Canada |
| Abstract | Sunspots are dark regions on the Sun's surface. The number of sunspots varies with an approximately 11-year cycle and is used as an indicator of the level of solar activity that drives space weather.
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| GEOSCAN ID | 291554 |
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