ARLA/CLUSTER: Forte explosão Solar registada ontem dia 29 de Outubro,

[João Costa > CT1FBF]

*SIGNIFICANT FARSIDE EXPLOSION: *Yesterday, Oct. 29th, something exploded
on the farside of the sun. It was probably a sunspot. NASA's Solar Dynamics
Observatory saw material flying over the edge of the solar disk (movie
<http://sdowww.lmsal.com/sdomedia/h264/2015/10/29/SSW_cutout_20151029T0205-20151029T0240_AIA_131-193-171_N00W75.mov>),
while the Solar and Heliospheric Observatory (SOHO) recorded a significant
CME:

<http://spaceweather.com/images2015/30oct15/cme_anim2.gif?PHPSESSID=aep42b1du4derimib8qjcrlo84>

The explosion was so strong, it peppered Earth with energetic particles
despite the fact that the blast site was hidden behind the body of the sun.
You can see the effect of those particles by playing this movie
<http://spaceweather.com/images2015/30oct15/cme_anim2.gif?PHPSESSID=aep42b1du4derimib8qjcrlo84>.
The speckles aren't stars. They are energetic protons from the sun striking
SOHO's onboard CCD camera. Fogging spacecraft cameras is just one of many
things a surge in solar protons can do; other effects include degrading the
efficiency of solar arrays, causing satellite computers to re-boot, and
ionizing Earth's upper atmosphere. The "proton storm" of Oct. 29th is subsiding
now
<http://spaceweather.com/images2015/30oct15/29Oct-Protons.jpg?PHPSESSID=aep42b1du4derimib8qjcrlo84>
.

The blast site will spend the next 10 days or so transiting the farside of
the sun, carried around by the 27-day spin of our star. If it still exists
at the end of that trip, the active region will emerge onto the Earthside
of the sun, and we will see what exploded. Stay tuned. * Solar flare alerts*:
text <http://spaceweathertext.com/> or voice <http://spaceweatherphone.com/>
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