sunspot minimum

sunspot minimum,
the period during the sunspot cycle in which sunspots are least frequent.

Useful english dictionary. 2012.

Look at other dictionaries:

  • 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

  • Minimum de Dalton — Le minimum de Dalton a eu lieu au début du XIXe siècle. Indépendamment des périodes de minimum apparaît très clairement une modulation du nombre de taches solaires, suivant le cycle solaire d environ 11 ans Le minimum de Dalton est une… …   Wikipédia en Français

  • Sunspot — Tache solaire Taches solaires Une tache solaire (anglais : sunspot) est une région sur la surface du Soleil (photosphère) qui est marquée par une température inférieure à son environnement et a une intense activité magnétique, qui inhibe la …   Wikipédia en Français

  • Minimum de Spörer — Le minimum de Spörer décrit une période de faible activité solaire qui s est étalé des années 1420 aux années 1570[1]. Il s est produit avant que les taches solaires aient été découvertes. Le phénomène climatique Il a été découvert… …   Wikipédia en Français

  • sunspot cycle — noun or sunspot period : the time between maxima in the varying numbers of sunspots averaging about 11 years but sometimes being many years shorter or longer * * * Astron. the cycle, averaging in duration slightly more than 11 years, in which the …   Useful english dictionary

  • sunspot cycle — Astron. the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again. Cf. solar cycle. * * * …   Universalium

  • Maunder Minimum — The Maunder minimum in a 400 year history of sunspot numbers The Maunder Minimum (also known as the prolonged sunspot minimum) is the name used for the period roughly spanning 1645 to 1715 when sunspots became exceedingly rare, as noted by solar… …   Wikipedia

  • Dalton Minimum — The Dalton minimum in the 400 year history of sunspot numbers The Dalton Minimum was a period of low solar activity, named after the English meteorologist John Dalton, lasting from about 1790 to 1830.[1] Like the Maunder Minimum and Spörer… …   Wikipedia

  • Solar minimum — is the period of least solar activity in the solar cycle of the sun. During this time, sunspot and solar flare activity diminishes, and often does not occur for days at a time. The date of the minimum is described by a smoothed average over 12… …   Wikipedia

  • Spörer Minimum — The Spörer Minimum was a period of low solar activity which lasted from about 1420 to 1570 (some say 1450 to 1550). It occurred before sunspots had been directly observed, and was discovered instead by analysis of the proportion of carbon 14 in… …   Wikipedia

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