ARLA/CLUSTER: Space Weather confirma que a 25 de fevereiro às 00H49 UTC registou-se a mais intensa explosão solar de 2014

[João Costa > CT1FBF]

Most intense flare of 2014

Space Weather report the returning sunspot AR1967 unleashed a powerful
X4.9-class solar flare on Feb. 25 at 00:49 UT

They say: This is the most intense flare of 2014 so far, and one of
the most intense of the current solar cycle. Although this flare is
impressive, its effects are mitigated by the location of the blast
site--near the sun's southeastern limb, and not facing Earth. Indeed,
a bright coronal mass ejection (CME) which raced away from the sun
shortly after the flare appears set to miss our planet.

Radio emissions from shock waves at the leading edge of the CME
suggest an expansion velocity near 2000 km/s or 4.4 million mph. If
such a fast-moving cloud did strike Earth, the resulting geomagnetic
storms could be severe. However, because its trajectory is so far off
the sun-Earth line, the CME will deliver a glancing blow, at best, and
probably no blow at all.

NASA's Solar Dynamics Observatory recorded the extreme ultraviolet
flash, the picture can be seen on the Space Weather site at
http://spaceweather.com/