lunedì 31 luglio 2017

solar wind and cme

HERE COMES THE SOLAR WIND: A high-speed stream of solar wind flowing from a hole in the sun's atmosphere is expected to reach Earth on July 31st.  NOAA forecasters estimate a 40% chance of minor geomagnetic storms when the solar wind arrives. High-latitude sky watchers should be alert for auroras, especially in the southern hemisphere where winter darkness favors visibility. Free: Solar Flare Alerts

FARSIDE EXPLOSIONS CONTINUE: Space-based observatories recorded another powerful explosion on the farside of the sun today. The blast hurled a bright coronal mass ejection (CME) over the sun's northeastern limb, shown here in a movie from the Solar and Heliospheric Observatory (SOHO):

NASA's STEREO-A spacecraft, which has a partial view of the sun's farside, pinpointed the explosion: The source appears to be old sunspot AR2665. The huge active region crossed the Earthside of the sun in early July, sparking moderately strong geomagnetic storms when it faced our planet. Apparently, it is still active, producing at least three significant CMEs since it began its farside transit more than 10 days ago.

AR2665 will spin back around to face Earth in early August. If the sunspot continues to explode, it could bring a new round of geomagnetic storms and auroras to our planet. Stay tuned. Free: Solar Flare Alerts

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