A 60-Year Old Mystery About the Moon's Magnetosphere Is Finally Solved
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One particularly well known fact about the Moon is that it doesn’t have much of a magnetosphere to speak of. There’s no blanket to protect it from the solar wind ravaging its surface, blowing away its atmosphere and charging the notoriously dangerous dust particles that make up its regolith. However, scientists have also known for around 60 years that some parts of the moon do experience sudden spikes in a magnetic field - some of which are up to 10 times stronger than the background magnetizati
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A 60-Year Old Mystery About the Moon's Magnetosphere Is Finally Solved By Andy Tomaswick - March 16, 2026 03:36 PM UTC | Planetary Science One particularly well known fact about the Moon is that it doesn’t have much of a magnetosphere to speak of. There’s no blanket to protect it from the solar wind ravaging its surface, blowing away its atmosphere and charging the notoriously dangerous dust particles that make up its regolith. However, scientists have also known for around 60 years that some parts of the moon do experience sudden spikes in a magnetic field - some of which are up to 10 times stronger than the background magnetization. Since their discovery, these “lunar external magnetic enhancements” have puzzled researchers - what was causing them, and why did they reach so high above the lunar surface that spacecraft could see them? A new paper published in The Astrophysical Journal Letters by Shu-Hua Lai and her colleagues at the National Central University in Taiwan explains for the first time what is likely causing these LEMEs - a novel type of the Kelvin-Helmholtz instability. If you’ve ever seen rolling wave-like clouds in the sky, you’ve seen the Kelvin-Helmholtz instability in action. It’s a fundamental physical process that happens whenever two fluids (or in space, two waves of plasma) are moving past each other at different speeds, creating what is known as a velocity shear. In the case of LEMEs, scientists knew the solar wind slammed into these “minimagnetospheres” created by surface anomalies of magnetic material in lunar regolith. But, they believed the KHI caused by this interaction would be localized to only the boundary where the two meet. It couldn’t explain why they were seeing magnetic fields on spacecraft hundreds of kilometers above the surface. Like many physical phenomena, KHI requires a lot of complex math, and Dr. Shu-Hua and her colleagues realized that, in an effort to explain these LEMEs, scientists were using a simplified form of math ...
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