The blast site could be one of two farside active regions currently under surveillance by NASA's STEREO spacecraft, but those active regions (see picture below) don't seem to be in the right place to hurl a CME over the sun's western limb.
The source might reveal itself in the days ahead as the sun's rotation turns unseen territory toward STEREO--or toward Earth. Stay tuned.
RELATED: SolarCyle24.com Message Board
RELATED: http://www.swpc.noaa.gov/rt_plots/xray_5mBL.html
The GOES X-ray Flux plot contains 5 minute averages of solar X-ray output in the 1-8 Angstrom (0.1-0.8 nm) and 0.5-4.0 Angstrom (0.05-0.4 nm) passbands. Data from the SWPC Primay GOES X-ray satellite is shown. As of Feb 2008, no Secondary GOES X-ray satellite data is available. Some data dropouts will occur during satellite eclipses.
Other plots of interest: A white background version of this plot; GOES 1-min X-rays; SWPC Real-time Monitors.
SWPC X-ray alerts are issued at the M5 (5x10E-5 Watts/m2) and X1 (1x10E-4 Watts/m2) levels, based upon 1-minute data. Large X-ray bursts cause short wave fades for HF propagation paths through the sunlit hemisphere. Some large flares are accompanied by strong solar radio bursts that may interfere with satellite downlinks.
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