ARLA/CLUSTER: Forte impacto de massa coronal na Terra na recente e maior Tempestade Geomagnetica Solar de ontem

[João Costa > CT1FBF]

CME impact, major geomagnetic storm

The Space Weather site reports a Coronal Mass Ejection hit Earth's
magnetic field on March 17 at approximately 04:30 UT which was earlier
than expected

At first, the impact sparked a relatively mild G1-class (Kp=5)
geomagnetic storm. Since then, however, the storm has intensified to
G4-class (Kp=8), ranking it as the strongest geomagnetic storm of the
current solar cycle.

Before sunrise on March 17, bright auroras were sighted over several
northern-tier US states including Minnesota, Wisconsin, Montana, the
Dakotas and Washington.

"The auroras were insane," says Marketa Murray who regularly runs a
photography workshop on the Arctic Circle. She has seen a lot of
auroras. "I have never seen anything like this."

On Tuesday afternoon the storm was expected to continue for many hours
as Earth passed through the turbulent wake of the CME. Stay tuned for
updates.

Space Weather
http://spaceweather.com/