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    "headline": "Parker Solar Probe finds hidden order in chaotic solar wind; its magnetic fields flip their twist",
    "description": "NASA's Parker Solar Probe data show solar wind magnetic fields reverse their twist at one scale, a 10-country team reported in a paper on October 13.",
    "datePublished": "2026-11-12T11:42:00+00:00",
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    "keywords": "NASA, Parker Solar Probe, Solar wind, University of Tokyo",
    "articleBody": "Deep inside the solar wind’s turbulence, NASA’s Parker Solar Probe has caught magnetic fields switching the direction they twist. Viewed outward along the wind’s path, the fluctuations rotate mostly counterclockwise at large scales but clockwise at small ones, and the crossover point moves steadily as the wind travels outward. An international team spanning ten countries reported the pattern on October 13 in The Astrophysical Journal Letters. “We see a clear structure in the spectrum, even though the turbulence represents unstructured motions,” said first author Masatomi Iizawa of the Technische Universität Braunschweig in Germany, in a release from the University of Tokyo. Co-author Nobumitsu Yokoi of the University of Tokyo called the results “of great significance for both plasma physics and astrophysics.” How they found it The team used readings from the FIELDS magnetometer on Parker Solar Probe gathered between September 29 and November 22, 2021. During those eight weeks the spacecraft swung from 0.1 to about 0.78 astronomical units from our star, and the researchers took one hour of high-rate data at each step along the way. They then measured magnetic helicity, a number describing which way the magnetic field winds around the direction of travel. In the solar wind this quantity usually looks like noise. Instead, at 0.1 astronomical units the team found a sharp negative peak near 10 hertz sitting next to a positive peak near 20 hertz, a paired signature the paper calls bihelical. The flip sits right where the plasma stops behaving like a smooth fluid and starts acting like a swarm of individual charged particles. Farther out, both peaks slid to lower frequencies, meaning the twisted structures were growing larger as the wind expanded. Why the drift matters Here is the surprise. If the solar wind simply spread out like an inflating balloon, the frequency of the feature should fall in step with distance, roughly as one over the solar distance. The authors instead found something closer to an exponential decline. To see the gap, take the team’s own rough guide curve, which shrinks the frequency by a factor of e for every 1/9 of an astronomical unit. Between 0.1 and 0.4 astronomical units, simple expansion would cut the frequency by a factor of 4 (0.4 divided by 0.1). The guide curve cuts it by about 15 (e raised to 9 times 0.3 is roughly 14.9). That mismatch points to nonlocal processes moving magnetic twist across scales, possibly the so-called helicity barrier that theorists have proposed. The stakes reach Earth. The University of Tokyo release notes that turbulence in space plasma shapes the shock waves and magnetic clouds thrown out by solar eruptions, a key factor in forecasting geomagnetic storms. Readers who caught October’s run of northern lights storms have seen what those disturbances can do in the sky. Limits A single spacecraft can only see rotation around the line pointing straight out from our star, so the measurement captures part of the magnetic helicity, not the full three-dimensional picture. Beyond about 0.5 astronomical units the clear signal fades. The authors suspect frequent crossings of the heliospheric current sheet may scramble it and call for checks with Solar Orbiter data at higher latitudes. The data cover one eight-week stretch in 2021, and the authors say they aim to show the effect occurs, not that it is universal in the inner solar system. Parker Solar Probe is one of several NASA craft making news this month, alongside Voyager 1, which reaches one light-day from Earth on November 18. The helicity paper is open access, and its analysis code is posted publicly for other teams to test. Image: NASA/Johns Hopkins APL/Steve Gribben, Public domain via Wikimedia Commons This article was produced with AI assistance and reviewed by our Editorial Desk. How we work.",
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