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'Elves' and 'blue jet' lightning in Earth's stratosphere spotted from space

Newly published observations from space are showing researchers more about the nature of Earth's lightning storms, including whimsically named phenomena such as "blue jets" and "elves."

The International Space Station's Atmosphere-Space Interactions Monitor (ASIM) observatory caught a single blue "jet" (upward-shooting lightning) from a thunderstorm cell, along with four "elves," or optical and ultraviolet emissions from the bottom of the ionosphere, according to a Nature paper published Wednesday (opens in new tab) (Jan. 20).

ASIM, a European instrument, can peer down at lightning from space. Its unique perch allows researchers to chase down elusive lightning phenomena (opens in new tab) that remain poorly understood after decades of research, mostly from ground observations. 

Video: See an 'elve' and 'blue jet' from space in this animation (opens in new tab)
Related:
NASA's Juno spacecraft spots 'sprites' and 'elves' dancing in Jupiter's atmosphere (opens in new tab)

European Space Agency astronaut Andreas Mogensen snapped this photo of a thunderstorm from the International Space Station in 2015. (Image credit: NASA)

Understanding the origins of lightning also could provide insight into how greenhouse gases are concentrated in Earth's atmosphere, the European Space Agency (ESA) said in a statement (opens in new tab).

"These bizarre-sounding [phenomena] are very difficult to observe from the surface of the Earth," ESA stated in the statement, about lightning's various forms. "Looking down on Earth's weather from the International Space Station 400 km [250 miles] above," the agency added, "ASIM's enhanced perspective is shedding new light on weather phenomena and their characteristics."

ASIM includes a bundle of instruments such as photometers (which measure light intensity), optical cameras, and an X-ray and gamma-ray detector. ASIM was delivered to and installed on the space station in 2018 (opens in new tab) to seek electrical discharges during Earth's storms.

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The Atmosphere-Space Interactions Monitor (ASIM) is pictured outside the European Columbus laboratory module on the International Space Station. (Image credit: NASA)

This latest bout of research generated a cover-page story in Nature along with the scientific paper, but it only represents a portion of ASIM's scientific output. In 2019, a Science paper based on ASIM results explored terrestrial gamma-ray flashes (opens in new tab) (TGFs) that occur when the strong electrical field associated with thunderstorms stimulates particles in the atmosphere; these particles then emit radiation. The 2019 study was also the first to suggest that lightning triggers TGFs and elves (opens in new tab)

More recently published papers from 2020 include comparing observations of the same lightning flash in Columbia (opens in new tab) from space and the ground, and a three-year summary of ASIM research (opens in new tab) describing applications in weather forecasting and public safety, among other data. 

A full list of papers based on the instrument's data is available at the ASIM Science Data Centre (opens in new tab).

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Elizabeth Howell, Ph.D., is a contributing writer for Space.com (opens in new tab) since 2012. As a proud Trekkie and Canadian, she tackles topics like spaceflight, diversity, science fiction, astronomy and gaming to help others explore the universe. Elizabeth's on-site reporting includes two human spaceflight launches from Kazakhstan, and embedded reporting from a simulated Mars mission in Utah. She holds a Ph.D. and M.Sc (opens in new tab). in Space Studies from the University of North Dakota, and a Bachelor of Journalism from Canada's Carleton University. Her latest book, NASA Leadership Moments, is co-written with astronaut Dave Williams. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday.