Juno Data Show Jupiter Tames the Solar Wind Differently Than Earth

Jupiter slows and heats the stream of charged particles from the Sun in a more elaborate way than Earth does, according to a study of measurements from NASA’s Juno spacecraft. The paper, published online July 31, 2026 in Nature Communications, drew new press coverage this week.

Both planets have magnetic fields that deflect the solar wind. Where the wind meets a planet’s magnetic bubble it hits a boundary called the bow shock, in which the fast, thin plasma is abruptly slowed and heated. The study, titled “Plasma wave observations from Juno spacecraft at the Jovian bow shock,” was led by researchers at the University of Iowa, with Jayasri Joseph as first author and co-authors including W. S. Kurth and S. J. Bolton. NASA funded the work, according to ScienceDaily and EurekAlert.

The team used data Juno collected in December 2024. Juno has orbited Jupiter since July 2016, and the plasma-wave measurements came from an instrument called Juno Waves, which was built at Iowa. The authors report that Jupiter’s bow shock works through plasma waves at multiple frequencies, known as harmonics, to dissipate the solar wind’s energy. Earth’s bow shock, by contrast, relies mainly on waves around a single frequency.

The study also reports “shocklets” at Jupiter, which are small disturbances that begin to slow the solar wind before it reaches the main shock. Earth generally lacks this extra step. “Jupiter has found its own way to deal with the solar wind,” Joseph said in the university’s account carried by ScienceDaily. Kurth said, “Earth does not need to take these extra steps.”

The authors suggest the findings have uses beyond Jupiter. A shock that behaves differently at another scale may serve as a nearby laboratory for understanding the much larger shock waves around supernova remnants, which are difficult to study directly, according to the coverage.

This is a single study from one spacecraft, and the press accounts do not detail how the conditions at Jupiter were separated from those at Earth, such as the planet’s much greater distance from the Sun and its far larger magnetic field. Neither account quotes an independent scientist, so how widely other researchers will accept the interpretation is not yet clear. A fair summary is that the measurements describe how this particular shock behaved when Juno crossed it, and that further passes would test whether the multi-frequency pattern is typical.

Juno’s orbit has provided a long record of Jupiter’s magnetic environment, which gives researchers a basis to check the pattern against other crossings. For now, the result adds a data point to the long-standing question of how shocks convert the energy of a fast-moving plasma into heat.