THE CME HAS ARRIVED: Arriving Hours Earlier Than Expected, A CME Struck Earth's Magnetic Field On April
THE CME HAS ARRIVED: Arriving hours earlier than expected, a CME struck Earth's magnetic field on April 15th (1700 UTC), and a minor G1-class geomagnetic storm is underway as a result of the impact. It's too soon to say whether this is just the first of two expected CMEs -- or perhaps a cannibal combination. NOAA forecasters say the storm could intensify to category G3 (Strong) in the hours ahead, depending on the strength and orientation of magnetic fields in the CME's wake. CME impact alerts: SMS Text.
These data from NOAA's DSCOVR satellite show how the CME's arrival altered Earth's solar wind environment:
The density of solar wind plasma abruptly jumped by a factor of almost ten. This means the CME delivered a relatively heavy blow to Earth's magnetosphere. Stay tuned for updates as Earth's moves deeper into the CME's wake.
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BIG HOLE IN THE SUN'S ATMOSPHERE: Minor G1-class geomagnetic storms are possible for the next 3 days (May 19-21) as Earth passes through a wide stream of high-speed solar wind. The gaseous material is flowing from a hole in the sun's atmosphere, which stretches across most of the sun's southern hemisphere. The million-kilometer-wide structure is shown in this extreme ultraviolet image from NASA's Solar Dynamics Observatory:
This is a "coronal hole"--a region in the sun's atmosphere where magnetic fields have opened up, allowing solar wind to escape. Coronal holes look dark because hot glowing gas normally contained there is missing. In this case, it is en route to Earth.
We've seen this coronal hole before--approximately every 28 days since February. Here it is in March, and again in April. It has been spinning around with the sun, emitting a stream of material akin to a giant lawn sprinkler. The stream encounter was particularly effective in March when it sparked auroras across many northern-tier US states.
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