Massive Solar Eruption Captured by Solar Orbiter Spacecraft

Solar Orbiter and SOHO’s view of a giant eruption – close up. Credit: Solar Orbiter/EUI and SOHO/LASCO teams, ESA & NASA

The ESA/NASA Solar Orbiter spacecraft has captured the largest solar prominence eruption ever observed in a single image together with the full solar disc.

Solar prominences are large structures of tangled magnetic field lines that keep dense concentrations of solar plasma suspended above the Sun’s surface, sometimes taking the form of arching loops. They are often associated with coronal mass ejections, which if directed towards Earth, can wreak havoc with our technology and everyday lives.

This latest event took place on February 15, 2022, and extended millions of kilometers into space. The coronal mass ejection was not directed at Earth. In fact, it is traveling away from us. There is no signature of the eruption on the solar disc facing the spacecraft – which is currently approaching the Earth-Sun line – meaning that it must have originated from the side of the Sun facing away from us.

The Full Sun Imager of the Extreme Ultraviolet Imager on board the ESA/NASA Solar Orbiter spacecraft captured a giant solar eruption on February 15, 2022. Solar prominences are large structures made of tangled magnetic field lines that keep dense concentrations of solar plasma suspended above the Sun’s surface and often take the form of arching loops. This is the largest solar prominence eruption ever observed in a single image together with the full solar disc. Credit: Solar Orbiter/EUI Team/ESA & NASA

The imagery was captured by the ‘Full Sun Imager’ (FSI) of the Extreme Ultraviolet Imager (EUI) on Solar Orbiter. FSI is designed to look at the full solar disc even during close passages of the Sun, such as during the upcoming perihelion passage next month. At closest approach on March 26, which will see the spacecraft pass within about 0.3 times the Sun-Earth distance, the Sun will fill a much larger portion of the telescope’s field of view. Right now, there is still a lot of ‘viewing margin’ around the disc, enabling stunning detail to be captured by FSI out to about 3.5 million kilometers, equivalent to five times the radius of the Sun.

Other space missions were also watching the event, including NASA’s Parker Solar Probe. Next week, Solar Orbiter and Parker Solar Probe will perform dedicated joint observations during Parker’s perihelion passage.

Even spacecraft not dedicated to solar science felt its blast – the ESA/JAXA BepiColombo mission, currently in the vicinity of Mercury’s orbit – detected a massive increase in the readings for electrons, protons, and heavy ions with its radiation monitor.

And while this event did not send a blast of deadly particles towards Earth, it is an important reminder of the unpredictable nature of the Sun and the importance of understanding and monitoring its behavior. Together with ESA’s future dedicated space weather mission Vigil, which will provide unique views of events like these, we can better protect our home planet from the Sun’s violent outbursts.

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