ON MARCH 15, the Sun erupted with an Earth-directed coronal mass ejection (CME), a solar phenomenon that can send billions of tonnes of solar particles into space and can reach Earth one to three days later and affect electronic systems in satellites and on the ground.
Experimental NASA research models, based on observations from the Solar Terrestrial Relations Observatory (STEREO) and ESA/NASA’s Solar and Heliospheric Observatory spacecraft, show that the CME left the Sun at speeds of around 14,50 kilometres per second, which is a fairly fast speed for CMEs. Historically, CMEs at this speed have caused mild to moderate effects when they reach Earth.
The NASA research models also show that the CME may pass by the Spitzer (an Earth-orbiting observatory) and Messenger (Mercury orbiter) spacecraft. NASA has notified their mission operators. There is, however, only minor particle radiation associated with this event, which is what would normally concern operators of interplanetary spacecraft since the particles can trip on-board computer electronics.
Earth-directed CMEs can cause a space weather phenomenon called a geomagnetic storm, which occurs when they connect with the outside of the Earth’s magnetic envelope, the magnetosphere, for an extended period of time.
In the past, geomagnetic storms caused by CMEs such as this one have usually been of mild to medium strength.
In Australia, the solar monitoring and notifications are the responsibility of IPS Radio and Space Services.
Adapted from information issued by NASA / GSFC. Image credit: ESA & NASA / SOHO.
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