sunspot groups

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• Sunspot — A sunspot is a region on the Sun s surface (photosphere) that is marked by intense magnetic activity, which inhibits convection, forming areas of reduced surface temperature. They can be visible from Earth without the aid of a telescope. Although …   Wikipedia

• Sunspot (comics) — Superherobox caption=Sunspot (left) with former teammates Cannonball and Magma on the cover to X Treme X Men #42. Art by Salvador Larroca. comic color=background:#ff8080 character name=Sunspot real name=Roberto da Costa species=Human Mutant… …   Wikipedia

• sunspot — sunspotted, adj. sunspottedness, n. /sun spot /, n. one of the relatively dark patches that appear periodically on the surface of the sun and affect terrestrial magnetism and certain other terrestrial phenomena. [1805 15; SUN + SPOT] * * * Cooler …   Universalium

• sun — sunlike, adj. /sun/, n., v., sunned, sunning. n. 1. (often cap.) the star that is the central body of the solar system, around which the planets revolve and from which they receive light and heat: its mean distance from the earth is about 93… …   Universalium

• Wolf number — The Wolf number (also known as the International sunspot number, relative sunspot number, or Zürich number) is a quantity which measures the number of sunspots and groups of sunspots present on the surface of the sun.The idea of computing sunspot …   Wikipedia

• solar cycle — Astron. the variation of sunspots, prominences, flares, and other solar activity through an 11 year cycle. Also called solar activity cycle. Cf. sunspot cycle. * * * Period in which several important kinds of solar activity repeat, discovered in… …   Universalium

• wolf number — ˈwu̇lf , ˈvȯlf noun Usage: usually capitalized W Etymology: after Rudolf Wolf died 1893 Swiss astronomer : sunspot number * * * /woolf/; Fr. /vawlf/, Astron. a number indicating the degree of sunspot activity on the sun as a factor of observer… …   Useful english dictionary

• Wolf number — /woolf/; Fr. /vawlf/, Astron. a number indicating the degree of sunspot activity on the sun as a factor of observer idiosyncrasies, the number of sunspot groups, and the number of individual sunspots. Also called relative sunspot number, sunspot… …   Universalium

• Wolf, Rudolf — ▪ Swiss astronomer in full  Johann Rudolf Wolf   born July 7, 1816, Fällenden, near Zürich, Switz. died Dec. 6, 1893, Zürich       Swiss astronomer and astronomical historian.       Wolf studied at the universities of Zürich, Vienna, and Berlin… …   Universalium

• Carrington rotation — The Carrington rotation of the Sun is a system for comparing locations on the Sun over a period of time, allowing the following of sunspot groups or reappearance of eruptions at a later time.Because the Solar rotation is variable with latitude,… …   Wikipedia

• solar prominence — Astron. prominence (def. 3). * * * Arched stream of hot gas projecting from the Sun s surface into the chromosphere or corona. Prominences can be hundreds of thousands of miles long and can be seen with the unaided eye during a total eclipse.… …   Universalium