Mercury slammed by gargantuan eruption from the sun's hidden far side, possibly triggering 'X-ray auroras'

News
By published

A gigantic plasma eruption from the sun's hidden far side recently launched a sizable coronal mass ejection that slammed into Mercury, potentially triggering invisible X-ray auroras around the planet's rocky surface.

Looped video footage of a massive plasma eruption coming from the sun's far side
A massive loop of plasma was seen exploding from the sun's far side on March 9. (Image credit: NASA/SDO)

A gigantic, fiery eruption around 40 times wider than Earth recently exploded from the sun's hidden far side. The eruption hurled a massive cloud of plasma into space that later smashed into Mercury, scouring the planet's rocky surface and potentially triggering "X-ray auroras" on the unprotected world.

The eruption was likely triggered by a powerful solar flare, which occurred around 7 p.m. ET on March 9, Spaceweather.com reported. NASA's Solar Dynamics Observatory (SDO) spotted a large, partially obscured plasma filament exploding outward from behind the sun's northeast limb. Based on the amount of visible plasma, the eruption likely spanned around 310,000 miles (500,000 kilometers) across.

SDO data showed that the explosion, which likely left behind a massive "canyon of fire" on the sun's surface, also released a large coronal mass ejection (CME) — a fast-moving cloud of magnetied plasma and radiation — that collided with Mercury on March 10.

Mercury is often blasted with CMEs due to its proximity to our home star. The small planet has no atmosphere left as a result of this bombardment and is fully exposed to the full force of these solar storms. 

When electrons from CMEs hit Mercury's unprotected surface, they rapidly slow down. This deceleration causes the particles to release energy in the form of X-rays, which scientists can detect from Earth. The result is an aurora-like phenomenon that is visible in X-rays rather than visible light, according to Live Science's sister site Space.com.

Related: 10 solar storms that blew us away in 2023

X-ray auroras on Mercury would not be visible with the naked eye but could be seen with X-ray filters on future probes. (Image credit: Thibaut Roger/Europlanet (CC BY-SA 4.0))

The gigantic eruption is the latest sign that the explosive peak of the sun's roughly 11-year solar cycle, known as solar maximum, may have already begun — much earlier than originally forecast.

During solar maximum, solar flares and other types of solar storms erupt more frequently and more powerfully as the sun's magnetic field weakens and eventually flips over. Scientists are already seeing signs of this happening.

In the last month, researchers have seen some of the biggest solar storms of the current cycle, including a monster X-class flare — the most powerful for more than six years — and a plume of plasma 15 times taller than Earth, which erupted from the sun's south pole.

One of the biggest concerns during solar maximum is that researchers can't properly monitor the far side of the sun, which can harbor giant sunspots that unleash surprise solar storms, like the one that just hit Mercury. It's possible that these sunspots could swing round to face Earth as the sun rotates, exposing our planet to flares and CMEs. For example, in January 2023, a hidden sunspot spat out an X-class flare without warning that narrowly avoided Earth.

One secret weapon NASA has up its sleeve to prevent being caught out by these unseeable dark patches is the Perseverance rover, which can sometimes spy on the sun's far side from its home on Mars. But this only works when Earth and Mars are located on opposite sides of the sun. 

Harry Baker
Harry Baker
Senior Staff Writer

Harry is a U.K.-based senior staff writer at Live Science. He studied marine biology at the University of Exeter before training to become a journalist. He covers a wide range of topics including space exploration, planetary science, space weather, climate change, animal behavior and paleontology. His recent work on the solar maximum won "best space submission" at the 2024 Aerospace Media Awards and was shortlisted in the "top scoop" category at the NCTJ Awards for Excellence in 2023. He also writes Live Science's weekly Earth from space series.