Image: An orbiting spacecraft called the Solar Dynamics Observatory
captured this view of the sun about an hour before it launched an
X-class solar flare. The purple coloring shows the strength of magnetic
fields of the sun. (NASA/SDO/AIA)
Wired Online has some details:
A giant solar flare shot out of a sunspot
Thursday, hitting Earth with a powerful burst of X-ray and ultraviolet
radiation. Solar researchers expect a small geomagnetic storm to follow
and strike Earth this weekend, causing minor satellite glitches and
major northern lights shows.
Right behind the flare is a belch of solar
atmosphere called a coronal mass ejection, or CME, which is now
traveling toward Earth at about 3.1 million mph. The resulting solar
storm should start on Earth on Friday and conclude by Saturday’s end.
Spaceweather has an interactive graphic showing the the path of the CME as it strikes the Earth
HERE. According to a
forecast track
prepared by analysts at the Goddard Space Weather Lab, the CME will hit
Earth on July 14th around 10:20 UT (+/- 7 hours) and could spark strong
geomagnetic storms.
ooo
The UV pulse partially ionized Earth’s upper atmosphere, disturbing
the normal propagation of radio signals around the planet. Monitoring
stations
in Norway and Ireland recorded the sudden ionospheric disturbance.
The solar protons accelerated by the blast are swarming around Earth.
The radiation storm ranks “S1″ on NOAA space weather scales, which
means it poses no serious threat to satellites or astronauts. However,
there is always the threat of more powerful events, with a more
signifiant out come, with a powerful CME pealing off the protective
magnetic shield. exposing satellites, power grids and other sensitive
electronic equipment.
National Geographic had an article on the history of the these more
powerful radiation storms and my friend George Rebane did some Bayesian
Analysis on the history of the more powerful events and concluded we
would be more vulnerable in Solar Cycle 25, estimated to peak around
2022
“The probability is 0.967 that in the next sunspot cycle we will have an ‘extreme storm’ as defined in the . . . data you sent.” Other scientist predict that we have a 1-8 chance of a more powerful event by 2020.