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Starlink satellites fall to Earth sooner throughout elevated photo voltaic exercise, examine finds

June 9, 2025
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Starlink satellites fall to Earth sooner throughout elevated photo voltaic exercise, examine finds
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Study shows Starlink satellites fall to Earth faster during increased solar activity
Annual quantity distribution of Starlink reentries and monthly-averaged F10.7 photo voltaic radio flux index information from 2000 to 2024. Reentry information was obtained from space-track.org. Credit score: arXiv (2025). DOI: 10.48550/arxiv.2505.13752

A trio of heliophysicists and satellite tv for pc trackers at NASA Goddard Area Flight Middle and the Goddard Planetary Heliophysics Institute on the College of Maryland has discovered proof exhibiting that Starlink satellites reenter Earth’s ambiance sooner throughout heightened photo voltaic exercise. For his or her paper posted on the arXiv preprint server, Denny Oliveira, Eftyhia Zesta and Katherine Garcia-Sage analyzed Starlink satellite tv for pc information over time 2020 and 2024, throughout a rising part of the photo voltaic cycle.

Each 11 years, the solar undergoes a cycle the place the frequency and depth of storms on its floor intensifies after which lessens. Such exercise tends to result in extra geomagnetic exercise in Earth’s higher ambiance, which might have an effect on satellites circulating the planet. The workforce at Goddard questioned what kind of influence the photo voltaic cycle has on Starlink satellites.

Taking a look at their information, the analysis workforce discovered that as geomagnetic exercise elevated, Starlink satellites tended to reenter the ambiance prior to they’d have throughout quieter intervals. Such satellites are designed to remain in orbit for about 5 years, however the examine discovered that in intervals of intense geomagnetic storms, the ultimate descent part—from a reference altitude of about 280 km to atmospheric reentry—was shortened by 10 to 12 days in comparison with quieter occasions.

The analysis workforce means that elevated warmth within the ambiance attributable to a rise in geomagnetic exercise results in extra drag on the satellites, which leads them to lose altitude. In addition they recommend the identical drag may lead to extra collisions between the satellites that make up constellations which might be deployed.

Additionally, the surprising reentry of the satellites can intrude with managed reentry. The elevated drag leads to the satellites falling sooner, which makes it extra possible they’ll hit the bottom earlier than burning fully—such was the case when a bit of particles from one of many satellites crashed onto a farm in Canada in 2024—which occurred to be on the peak of a photo voltaic cycle.

The workforce concludes that because the variety of satellites in orbit continues to develop, cautious monitoring and prediction will change into much more vital during times of excessive photo voltaic and geomagnetic exercise to safeguard towards each orbital collisions and potential particles impacts on Earth.

Extra data:
Denny M. Oliveira et al, Monitoring Reentries of Starlink Satellites Through the Rising Part of Photo voltaic Cycle 25, arXiv (2025). DOI: 10.48550/arxiv.2505.13752

Journal data:
arXiv


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