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In mid-November 2023, a disastrous SpaceX launch, which saw the explosion of not one but two rockets, offered a rare opportunity to study the effects of such phenomena on the ionosphere.
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A study by Russian scientists revealed how this explosion temporarily blew open a hole in the ionosphere stretching from the Yucatan to the southeastern U.S.
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Although far from the first rocket-induced disturbance in the ionosphere, this is one of the first explosive events in the ionosphere to be extensively studied.
November 18, 2023, wasn’t a great day for the commercial spaceflight company SpaceX. While testing its stainless steel-clad Starship, designed to be the company’s chariot to Mars, the spacecraft exploded four minutes after liftoff over the skies of Boca Chica, Texas.
Filling a metal candle with more than a thousand tons of propellant and flinging it into outer space has always run its fair share of risks (and explosions), but this particular event—occurring around 93 miles above the Earth’s surface—allowed scientists to closely study one poorly understood aspect of human spaceflight: What damage do rockets inflict on the Earth’s all-too-important ionosphere?
Lying at the edge of the planet’s atmosphere and outer space some 50 to 400 miles above the surface, the ionosphere is a sea of electrically charged particles vital to global radio and GPS technologies as well as protecting us from harmful solar rays. Because of its important role in the everyday function of modern society, scientists are eager to understand how disturbances in the ionosphere can impact life on Earth, and that’s why team of researchers from institutes and universities in Russia and France analyzed the explosion of the tallest and most powerful rocket ever built. The results were published in the journal Geophysical Research Letters.
Although bad news for SpaceX, the explosion oddly presented a rare opportunity to study aspects of the ionosphere that would, under normal conditions, be too weak to detect.
“Such catastrophic phenomena, such as the explosion of the Starship, are interesting precisely because you can see effects that equipment is not able to detect in weaker events,” the scientists told TASS, a Russian state-sponsored news agency. “Analyzing the data and understanding their nature, we understand more deeply the structure of the ionosphere [and] the nature of the phenomena that occur in it.”
The ionosphere is regularly impacted by external natural phenomena. Volcanic eruptions, geomagnetic storms, and solar flares regularly crash against the ionosphere and create a dazzling display of colors known as the Aurora Borealis and Australis, which typically propagate close to the planet’s poles (though not always). However, there’s also a well-documented history of human-made rockets ripping open holes in this electrically-charged protective layer. In July 2023, Spaceweather.com reported a “bleeding” aurora that persisted for 20 minutes following a SpaceX Falcon 9 rocket launch, and a rocket carrying a U.S. Space Force satellite similarly punched a hole through the ionosphere, though it, too, quickly recovered.
Both of these events were caused by ionospheric interactions with rocket fuel, but the November mishap was a full-blown explosion. This new study confirms that the ionosphere experienced a “large-amplitude total electron content depletion,” likely reinforced by a fuel exhaust impact of the Falcon Heavy rocket, which also exploded a little more than a minute earlier at lower altitude once it separated from the Starship. The research team collected this data from 2,500 ground stations scattered across North America and the Caribbean and found that the hole extended largely from Mexico’s Yucatán peninsula and the southeastern U.S., though the exact size of the hole is unknown.
Luckily for us, these atmospheric holes aren’t nearly as dire as the ozone hole that rattled the world in the 1990s (and will slowly heal itself by mid-century), as the scientists report that this Starship-induced ion hole caused by “catastrophic phenomena” closed up after 30 or 40 minutes. But these kinds of interactions are still poorly understood, and that’s concerning considering how central the ionosphere is to global technologies—not to mention human health.
So in a strange way, a bad day for SpaceX is a good day for atmospheric scientists around the world and, because it’ll go a long way toward science’s understanding of the ionosphere, us.
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Source Agencies
