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Why photo voltaic flares are approach hotter than researchers thought : NPR

September 5, 2025
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Why photo voltaic flares are approach hotter than researchers thought : NPR
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NASA’s Solar Dynamics Observatory, which watches the sun constantly, captured an image of a mid-level solar flare on Jan. 12, 2015.

NASA’s Photo voltaic Dynamics Observatory, which watches the solar consistently, captured a picture of a mid-level photo voltaic flare on Jan. 12, 2015.

NASA/Goddard House Flight Middle/Photo voltaic Dynamics Observatory


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NASA/Goddard House Flight Middle/Photo voltaic Dynamics Observatory

Stunning but harmful photo voltaic flares that erupt from the solar may very well be as scorching as 180 million levels Fahrenheit, researchers say.

That is greater than six instances hotter than photo voltaic physicists beforehand believed, in line with a brand new report in Astrophysical Journal Letters.

Alexander Russell, a physicist with the College of St. Andrews in Scotland, known as that temperature “a loopy quantity” that he and his colleagues discovered “unbelievable.”

NASA's Solar Dynamics Observatory captured this image of solar flares early Saturday afternoon. The National Oceanic and Atmospheric Administration says there have been measurable effects and impacts from the geomagnetic storm.

Photo voltaic flares happen when magnetic vitality will get out of the blue launched and dumped into particles. These particles, ions and electrons, get heated up and shoot out at nice velocity.

Beforehand, researchers used telescopes to measure the temperature of electrons in photo voltaic flares. “And we have sort of simply assumed, nicely, the ion temperature could be the identical because the electron temperature,” says Russell.

However current laptop simulations and measurements in near-Earth house counsel that this assumption is unsuitable: They present that ions warmth up far more.

In light of the solar maximum, a look at the biggest solar storm in recorded history

Russell and his colleagues did some calculations and located that photo voltaic flares might really be over 100 million levels Fahrenheit, and fairly presumably hotter.

James Drake, a physicist on the College of Maryland who wasn’t a part of this analysis staff, has been learning how magnetic processes warmth and velocity up electrons and ions for a while. He says till now, the distinction between the 2 has been neglected on the subject of photo voltaic flares.

“We have been confronting the photo voltaic physicists,” says Drake, “telling them that regardless that they’ve measured in loads of element what is going on on with the electrons, they’re lacking one thing huge.”

When Our Star Erupts - The 1859 Solar Storm And More

That is why he says he was blissful to see this new evaluation, because it might result in a greater understanding of how photo voltaic flares work. And that in flip might assist defend {hardware} like satellites and folks like astronauts from these harmful however superior eruptions.

“We’re already busy on the subsequent steps,” says Russell, who says they’re growing fashions of how flares evolve when the ions are heated extra strongly than the electrons.



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