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Bookmark or Share- Sunspot - WikipediaSolar cycles last typically about eleven years, varying from just under 10 to just over 12 years. Over the solar cycle, sunspot populations increase quickly and then decrease more slowly. The point of highest sunspot activity during a cycle is known as solar maximum, and the point of lowest activity as solar minimum.
- Sunspots: What are they, and why do they occur? | SpaceSunspot positions also change throughout the solar cycle. During the solar maximum, many sunspots are found along mid-latitudes (approximately 30 degrees north and 30 degrees south).
- Sunspots/Solar Cycle | NOAA / NWS Space Weather Prediction CenterSunspots appear in a wide variety of shapes and forms. The darkest area of a sunspot (also the first to be observed) is called the umbrae. As the sunspot matures (becomes more intense), a less dark, outlying area of well-defined fibril-like structure develops around the umbrae - called penumbra.
- Sunspot | Solar Flares, Magnetic Fields & Sunspots | Britannicasunspot, vortex of gas on the surface of the Sun associated with strong local magnetic activity. Spots look dark only by contrast with the surrounding photosphere, which is several thousand degrees hotter. The dark centre of a spot is called the umbra; the outer, lighter ring is the penumbra.
- What Are Sunspots? - timeanddate.comAs the first spots of a new cycle appear, they are at the higher latitudes of the Sun, and increase in size and activity until solar maximum—the peak of sunspot activity—is registered. Scientists label these cycles numerically.
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