sunspot number

sunspot number
noun
: an arbitrary numerical value that is used to describe the sun's spottedness, is the number of individual spots plus 10 times the number of disturbed regions, and depends upon the instrumental equipment and personal equation of the observer

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Astron.

Useful english dictionary. 2012.

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  • sunspot number — Astron. See Wolf number. * * * …   Universalium

  • relative sunspot number — Astron. See Wolf number. * * * …   Universalium

  • relative sunspot number — Astron. See Wolf number …   Useful english dictionary

  • 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 equilibrium — In economics, a sunspot equilibrium is an economic equilibrium where the market outcome or allocation of resources varies in a way unrelated to economic fundamentals. In other words, the outcome depends on an extrinsic random variable, i.e. on… …   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

  • sunspot — /ˈsʌnspɒt / (say sunspot) noun 1. one of the relatively dark patches which appear periodically on the surface of the sun, and which have a certain effect on terrestrial magnetism and other terrestrial phenomena. Their appearance is spasmodic but… …  

  • 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

  • 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

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