BIG FARSIDE SUNSPOTS: There are two sunspot groups on the farside of the sun so big they are affecting the way the whole sun vibrates.
Helioseismic maps suggest that one of them will turn toward Earth this weekend. The appearance of another big sunspot group would help keep sunspot numbers elevated at their current
20-year high.
Solar flare alerts: SMS Text
X-CLASS SOLAR FLARE: As predicted, strangely-magnetized sunspot AR3784 (described below) erupted today, producing an X1.1-class solar flare. The explosion was directly facing Earth:
Radiation from the flare ionized the top of Earth's atmosphere, causing a deep shortwave radio blackout over India and the Middle East:
map. Ham radio operators may have noticed loss of signal at all frequencies below 30 MHz for 30+ minutes after the flare's peak (0640 UT).
Radio emissions and preliminary coronagraph images suggest that this explosion may have hurled a faint CME toward Earth. If so,
a NASA model predicts it will strike Earth around 1200 UTC on Aug. 17th.
CME impact alerts: SMS Text
A STRANGELY MAGNETIZED SUNSPOT: Sunspot AR3784 is breaking
Hale's Law. According to that hundred-year-old rule, sunspots in the sun's northern hemisphere should be polarized like this:
. Instead, AR3784 is polarized like this:
. This magnetic map from NASA's Solar Dynamics Observatory shows the 90-degree twist:
Violations of Hale's Law do happen from time to time. About 3% of all sunspots are "reversed polarity":
instead of
or vice versa. However, AR3784 is neither normal (
) nor reversed (
). It's halfway in between (
).
The magnetic underpinnings of this sunspot seem to be corkscrewing in an unusual way. If opposite magnetic polarities get
twisted together too tightly, there could be an X-class solar flare. Stay tuned!
Solar flare alerts: SMS Text