Полярные сияния без магнитных бурь

25 ноября. На фоне бурных событий октября в этом месяце Солнце выглядит «блекло». Нет мощных вспышек, эффектных выбросов плазмы, скорострельного ветра и магнитных бурь. Но при всем том периодически появляются полярные сияния. Данное фото было сделано 21 ноября в Черчилле (провинция Манитоба, Канада).

Эксперты NASA считают, что полярные сияния являются откликом на колебания солнечного ветра.

Источник: Новости Гисметео

NORTHERN LIGHTS: As winter approaches, days are growing short around the Arctic Circle. "Luckily we still have Northern Lights to illuminate our village," says Miika Sirkiä, who sends this picture from Kittilä in the Finnish Lapland:

"Around midnight on Nov. 24th, the auroras were very bright--enough to turn the river Ounasjoki green," says Sirkiä.

Auroras have been flickering around the Arctic Circle for several days. These displays are not caused by major solar activity. Instead, they are prompted by small magnetic fluctuations in the solar wind. The interplanetary magnetic field (IMF) near Earth tips south, partially canceling Earth's north-pointing magnetic field. Solar wind pours in, oh so briefly, to excite the Northern Lights. Aurora alerts: text, phone.

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» #1 написал: VP (29 ноября 2011 13:12)
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SINUOUS SUNSPOTS: A line of sunspots stretching across the sun's northern hemisphere appears to be an independent sequence of dark cores. A telescope tuned to the red glow of solar hydrogen, however, reveals something different. The sunspots are connected by sinuous filaments of magnetism:

"These sunspots writhe and squirm energetically as they rotate away from us!" says John Nassr, who took the picture on Nov. 28th from his backyard observatory in Baguio, the Philippines.

The connections suggest an interesting possibility. While each sunspot individually poses little threat for strong solar flares, an instability in one could start a chain reaction involving all, leading to a widespread eruption. Readers with solar telescopes are encouraged to monitor developments.

CME IMPACT: As predicted by analysts at the Goddard Space Weather Lab, a coronal mass ejection (CME) hit Earth's magnetic field at approximately 2145 UT on Nov. 28th. The impact was weaker than expected, but it still produced bright auroras around the Arctic Circle:

"The CME that hit Earth gave us some nice, colourful and easy-moving auroras," says photographer Antti Pietikäinen of Muonio, Lapland, Finland, who enjoyed the show with his two dogs.

Also in the Finnish Lapland, Chad Blakely says "the auroras exploded all over the sky. If this is a sign of things to come the rest of the season should be fantastic!!"

Not bad for a "weak impact." Aurora alerts: text, phone.

Полярные сияния без магнитных бурь

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