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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Chorus waves have been considered major drivers of brief, intense electron losses from Earth’s radiation belts. But an analysis of observations from NASA’s THEMIS and SAMPEX missions found that only a very small percentage of chorus waves coincided with relativistic microbursts. The result challenges a broad explanation without showing that chorus waves cause no microbursts: the waves linked to events tended to have larger amplitudes and other distinguishing traits.
What chorus waves and relativistic microbursts are
Earth’s Van Allen radiation belts are regions of energetic charged particles trapped by the magnetosphere. Chorus waves are naturally occurring electromagnetic waves in the surrounding plasma. Their name comes from the sound a radio receiver produces when it detects them. These waves can accelerate trapped electrons to high speeds, which is one reason they have been considered important to radiation-belt dynamics.
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A relativistic microburst is a short, intense episode in which highly energetic electrons precipitate from the outer radiation belt into the atmosphere. Eos describes each surge as lasting less than one second. Microbursts may affect radiation-belt hazards and atmospheric chemical composition, though the Eos account does not quantify those effects.
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The study by Jorge Romero-Minaya and colleagues analyzed observations from NASA’s THEMIS and SAMPEX missions collected between June 2010 and November 2012. As summarized by Sarah Stanley in an Eos research spotlight published 22 September 2026, a very small percentage of chorus waves occurred in conjunction with relativistic microbursts—less than prior studies had led researchers to expect. The Eos summary gives no exact percentage, so the result cannot be translated into a specific rate here.
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The waves associated with microbursts tended to have larger amplitudes and other distinguishing characteristics. That pattern leaves open the possibility that a small subset of chorus waves matters especially for microbursts at these high energies, rather than the overall chorus-wave population being a broad driver.
Why coincidence does not establish cause
The reported result is about statistical association: how often chorus waves and microbursts appeared together in the analyzed observations. Coincidence alone does not demonstrate that a wave triggered a burst. Nor does a low coincidence rate prove that chorus waves never contribute; it instead complicates the idea that chorus waves generally explain relativistic microbursts.
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The Eos account does not provide event counts, the precise fraction, matching criteria, uncertainty estimates, or detailed methodological limitations. Those details are needed to assess how the statistical result was produced and how broadly it applies. The underlying article is Jorge Romero-Minaya et al., “Observational Analysis on the Relationship Between Chorus Waves and MeV Microburst Electron Precipitation,” published in Geophysical Research Letters in 2026 (doi:10.1029/2026GL124627).
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The observations shift attention from chorus waves as a whole toward whether particular wave properties distinguish those associated with microbursts. The larger amplitudes and other traits reported for the coincident waves make that a plausible direction for further investigation, not a settled explanation.
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The analysis used data collected in 2010–2012; the 2026 publication date does not mean the observations were newly collected that year. Its reported association result narrows the claim that can be made from this dataset, but it does not resolve every way chorus waves may affect radiation-belt electrons.
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Sources
- Sarah Stanley, Eos / AGU, “Presumed Role of Chorus Waves Out of Tune with New Data,” 22 September 2026: https://eos.org/research-spotlights/presumed-role-of-chorus-waves-out-of-tune-with-new-data.
- Jorge Romero-Minaya et al., “Observational Analysis on the Relationship Between Chorus Waves and MeV Microburst Electron Precipitation,” Geophysical Research Letters (2026), doi:10.1029/2026GL124627.
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