Sun Down; Solar Physics  

Oleh:

[s.n]

Jenis: Article from Bulletin/Magazine
Dalam koleksi: The Economist (http://search.proquest.com/) vol. 399 no. 8738 (Jun. 2011), page 84.
Topik: Solar Flares; Sunspots; Solar Physics
Fulltext: Sun down.pdf (36.25KB)

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Perpustakaan Pusat (Semanggi) Nomor Panggil: EE29.66 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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During the four centuries that it has been studied in detail, the sun has usually behaved in a regular manner. The number of spots on its surface has waxed and waned in cycles that last, on average, 11 years. Sometimes, though, the sun sulks and this solar cycle stops. That has happened twice since records began: during the so-called Maunder minimum of 1645 to 1715 and the Dalton minimum of 1790 to 1830. An absence of sunspots also means an absence of solar flares and their more violent siblings, coronal mass ejections. Such outbursts disrupt radio and satellite communications, electricity grids and a variety of electronic equipment, so the pattern of solar activity is of more than academic interest. A new solar minimum, then, would test theories about how the climate works and also make communications more reliable. And many solar physicists think such a new minimum is on the cards.

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