ARLA/CLUSTER: Inesperada tempestade geomagnética no dia 7 de Janeiro

[João Costa > CT1FBF]

*UNEXPECTED GEOMAGNETIC STORM:*

A strong G3-class
<http://legacy-www.swpc.noaa.gov/NOAAscales/index.html#GeomagneticStorms>
geomagnetic storm erupted during the early hours of Jan. 7th, sparking
bright auroras around Earth's poles.

What happened? The interplanetary magnetic field (IMF
<http://spaceweather.com/glossary/flareclasses.html?PHPSESSID=ifb1l80koltqo8e89c250b3go6>)
near our planet tipped south, opening a crack
<http://science.nasa.gov/science-news/science-at-nasa/2003/03dec_magneticcracks/>
in Earth's magnetosphere.

Solar wind poured in to fuel the strongest magnetic storm since Sept. 2014.
NOAA analysts believe the fluctuation in IMF is related to the arrival of a
CME originally expected to miss Earth.

Browse the aurora gallery
<http://spaceweathergallery.com/aurora_gallery.html> for pictures of the
event.

*Aurora alerts:* text <http://spaceweathertext.com/>, voice
<http://spaceweatherphone.com/>

Visit http://spaceweather.com for images and more information.
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