jeudi 10 mai 2012

Alerte ! : Eruption solaire Classe X en vue

Un groupe de taches long de 100 000 km dirigé vers la Terre pourrait provoquer une éruption de classe X aujourd'hui jeudi.

Effets possibles :
-aurores boréales.
-pannes satellitaires.
-pannes dans le réseau electrique.

Michua Kaku l'avait prédit depuis longtemps, comment il a su ?

L'article du spacewather (Anglais).

SOLAR ACTIVITY INTENSIFIES: Huge sunspot AR1476 is crackling with M-class solar flares and appears to be on the verge of producing something even stronger. The sunspot's 'beta-gamma-delta' magnetic field harbors energy for X-class flares, the most powerful kind. Earth is entering the line of fire as the sunspot rotates across the face of the sun. Solar flare alerts: text, phone.

Earlier today, amateur astronomer Thomas Ashcraft of New Mexico detected strong shortwave radio bursts coming from the sunspot. Click to hear the "solar static" that roared out of his loudspeaker:

Dynamic spectrum courtesy of Wes Greenman, Alachua Radio Observatory

"The strongest burst so far occured around 1631 UT on May 9th," reports Ashcraft. "I am observing at 28 MHz and 21.1 MHz. As I send this note I am hearing more bursting, indicating powerful magnetic dynamism within active region 1476."

Solar radio bursts are caused by plasma instabilities that ripple through the sun's atmosphere in the aftermath of powerful flares. With AR1476 poised for more eruptions, this 'radio activity' is likely to continue for days. Stay tuned.

NORTHERN LIGHTS: A solar wind stream hit Earth's magnetic field during the late hours of May 8th, stirring geomagnetic activity and auroras at high latitudes. Zoltan Kenwell photographed the display from a dark-sky site 120km northeast of Edmonton, Alberta:

"The frogs by the lake were deafening!" says Kenwell. "The show began very slowly around 10:00pm MST and was done around 1:00am MST. Temperatures of +12 deg C made for a very enjoyable night while taking in a splendid display."

A pair of CMEs en route to Earth could add to the effect of the solar wind stream, igniting even brighter auroras during the next 24-48 hours. NOAA forecasters estimate a 40% chance of geomagnetic storms on May 9th.

1 commentaires:

Andrée a dit…

Bon anniversaire à ton blog!
Et merci pour ce que tu fais, tu figures parmi mes incontournables du matin.
Bonne journée:)

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