ARLA/CLUSTER: FLARE X1.4 !!! SFI ainda vai subir mais ... mesmo a tempo para o IARU HF Championship ...

[Pedro Ribeiro]

*X-FLARE! * Big sunspot AR1520 unleashed an X1.4-class solar flare on 
July 12th at 1653 UT. Because the sunspot was directly facing Earth at 
the time of the blast, this is a geoeffective event. Stay tuned for 
updates about possible CMEs and radio blackouts. **

NASA's Solar Dynamics Observatory recorded a flash of extreme 
ultraviolet radiation from the blast site:

<http://spaceweather.com/images2012/12jul12/x1p4.jpg?PHPSESSID=s6mmb2masfj6nrpdo7e20arap5>

The UV and X-ray pulse from the flare will have partially ionized 
Earth's upper atmosphere on the dayside of our planet, disturbing the 
normal propagation of radio signals.

Fonte: http://spaceweather.com/

73!

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