Spörern.
/ˈʃpɔːrə/ Astronomy.
a. Spörer's law n. an empirical relationship noticed by Spörer according to which the mean latitude of sunspots tends to decrease as a sunspot cycle progresses.
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Spörer's law1922
1922 Monthly Notices Royal Astron. Soc. 82 536 Each cycle begins with an activity in high latitude; each cycle ends with the last remnants of activity transferred to a low one. This is what is known as ‘Spoerer's Law of Zones’.
1968 P. Moore Sun v. 52 Spörer's law is undoubtedly significant, and if we could explain it we should obtain a valuable clue as to the cause of the solar cycle.
b. Spörer minimum n. the interval between about a.d. 1400 and 1510 during which little activity is thought to have taken place on the sun.
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the world > the universe > sun > solar activity > [noun] > solar radiation > inactivity
Spörer minimum1976
1976 J. A. Eddy in Science 18 June 1196/1 The earlier minimum, which we might call the Spörer Minimum, persisted by our 10-parts-per-mil criterion from about 1460 through 1550... We can presume that the Spörer Minimum was probably as pronounced as the Maunder Minimum and that during those years there were few sunspots indeed.
1976 J. A. Eddy in Science 18 June 1199/3 The Spörer Minimum of the 16th century is coincident with the other severe temperature dip of the Little Ice Age.
1978 Daily Tel. 8 May 11/8 The 15th century..marked the Sporer Minimum of sunspots..and was cold.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2022).
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n.1922