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Earth’s thermosphere reaches highest temperature in 20 years after being bombarded by solar storms

June 25, 2023
in Science
Earth’s thermosphere reaches highest temperature in 20 years after being bombarded by solar storms
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The tops of three coniferous trees poke out from the bottom left, as an upward view of the night sky is lit with vibrant shades of green, pink and purple shooting out in sheets as rays of light from the image's center.

A vibrant aurora display during a geomagnetic storm.
(Image credit: Shutterstock)

Earth’s thermosphere recently hit a near 20-year temperature peak after soaking up energy from geomagnetic storms that bashed Earth this year. The temperature in the second-highest layer of the atmosphere will likely continue to climb over the next few years as the sun’s activity ramps up, which could impact Earth-orbiting satellites, experts warn.

The thermosphere extends from the top of the mesosphere, at around 53 miles (85 kilometers) above ground, to the bottom of the exosphere, which begins at around 372 miles (600 km) above the ground, according to NASA. Beyond the exosphere is outer space.

For more than 21 years, NASA has measured the thermosphere temperature via infrared radiation emitted by carbon dioxide and nitric oxide molecules. Scientists convert data collected by NASA’s Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) satellite, into the Thermosphere Climate Index (TCI), which is measured in terawatts, or TW. (1 TW is equal to 1 trillion watts.)

The TCI value, which spiked on March 10, peaked at 0.24 TW, Martin Mlynczak, a leading researcher on the TIMED mission at NASA’s Langley Research Center in Virginia and creator of the TCI, told Live Science. The last time the TCI was this high was Dec. 28, 2003. (The temperature spike data has been submitted to a journal but has not yet been peer-reviewed.)

RELATED: Earth’s atmosphere: Facts about our planet’s protective blanket

The temperature spike was caused by three geomagnetic storms in January and February — major disturbances to Earth’s magnetic field that are triggered by chunks of fast-moving magnetized plasma, known as coronal mass ejections (CMEs), and less often by streams of highly charged particles, known as solar wind, which are both spat out by the sun.  

“These ‘storms’ deposit their energy in the thermosphere and cause it to heat up,” Mlynczak said. “The increased heating results in increased levels of infrared emission from nitric oxide and carbon dioxide in the thermosphere.” Normally, infrared emissions after a storm cool the thermosphere, he added, but when the storms come back to back the temperature stays high.

Since the spike, at least two more geomagnetic storms have hit our planet — one on March 24, which was the most powerful solar storm to hit Earth for more than six years, and another equally powerful storm on April 24. The TCI values following these storms have remained high but have not yet passed the March peak, Mlynczak said.

A graph showing how the TCI value rises and falls with each solar cycle.

A graph showing how the TCI value rises and falls with each solar cycle.  (Image credit: Marty Mlynczak (NASA Langley Research Center) and Linda Hunt (Science and Technology Corporation)

Geomagnetic storms become more frequent and intense during solar maximum, a part of the roughly 11-year solar cycle in which the sun is most active and covered in dark sunspots and plasma loops that spit out CMEs and solar wind. 

As a result, Earth’s thermosphere also follows a roughly 11-year cycle, Mlynczak said. Government scientists from NASA and NOAA predicted the next solar maximum will arrive in 2025, which means the warming trend will likely continue over the next few years. 

Changes to the thermosphere can pose challenges for satellites in low-Earth orbit that are positioned around the thermosphere’s upper boundary, Mlynczak said.

“The thermosphere expands as it warms,” Mlynczak said, resulting in “increased aerodynamic drag on all satellites and on space debris.” This increased drag can pull satellites closer to Earth, he said, which could cause satellites to crash into one another or completely fall out of orbit, as SpaceX Starlink satellites did in February 2022 after a surprise geomagnetic storm.

Satellite operators can avoid these issues by positioning their spacecraft in a higher orbit when needed, but the unpredictability of space weather makes it hard to know when these maneuvers are required until it is often too late.

Solar maximum could also arrive sooner than predicted. A recent study published Jan. 30 in the journal Frontiers in Astronomy and Space Sciences suggests that the solar activity peak could arrive as early as late 2023 and be more powerful than initially predicted. If this scenario plays out, then the risk of a satellite disaster further increases.  

However, over longer timescales, temperatures in the thermosphere are declining, because excess CO2 in the thermosphere due to climate change increases infrared emissions into space, a May 8 study in the journal Earth Atmospheric and Planetary Sciences found. 

Originally published on LiveScience.com.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Breaking space news, the latest updates on rocket launches, skywatching events and more!

Harry is a U.K.-based staff writer at Live Science. He studied Marine Biology at the University of Exeter (Penryn campus) and after graduating started his own blog site “Marine Madness,” which he continues to run with other ocean enthusiasts. He is also interested in evolution, climate change, robots, space exploration, environmental conservation and anything that’s been fossilized. When not at work he can be found watching sci-fi films, playing old Pokemon games or running (probably slower than he’d like). 

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