A team of researchers at Kyoto University has devised an innovative method using orbital data from around 1,200 Starlink satellites to visualize variations in Earth's thermosphere — the upper atmosphere about 500 kilometers above the planet. This breakthrough could improve satellite tracking and reduce collision risks in increasingly crowded low Earth orbit.
- New method uses Starlink satellite drag to map thermospheric density.
- First tomographic analysis revealing horizontal atmosphere variations.
- Improved data supports safer satellite navigation and space weather forecasts.
What happened
Researchers at Kyoto University combined space science and engineering approaches to develop a new imaging technique for Earth’s thermosphere, a highly elusive part of the upper atmosphere ranging roughly from 100 to 1000 kilometers altitude. By utilizing publicly available orbital data from about 1,200 Starlink satellites flying near 482 kilometers above Earth, the team measured atmospheric drag effects to estimate variations in neutral atmospheric density.
Applying tomography, a method typically used in medical imaging, the scientists produced two-dimensional latitude-longitude maps illustrating how the atmosphere’s density varies horizontally at roughly 500 kilometers altitude. This marks the first time such detailed tomographic analysis has been applied to the thermosphere, complementing prior work that focused only on density changes over time and altitude.
Why it feels good
The thermosphere’s neutral gas is notoriously difficult to observe directly, unlike the ionosphere where ionized gas allows for easier detection via radio waves. By creatively using satellite orbit decay data, this new method opens a practical window into tracking atmospheric conditions in this challenging region, a significant boost for both atmospheric science and engineering.
Such detailed density maps help improve predictions of satellite trajectories by accounting for atmospheric drag more accurately. As low Earth orbit becomes increasingly congested with satellites and space debris, having better data to forecast their movements enhances collision avoidance measures, contributing to safer space operations.
What to enjoy or watch next
This innovative use of Starlink satellites could lead to near-real-time monitoring of atmospheric density, supporting improved space weather predictions and more reliable satellite functioning. The research team’s approach encourages further multidisciplinary collaborations to refine our understanding of Earth’s upper atmosphere.
Looking ahead, similar techniques may be applied across other satellite constellations to broaden spatial coverage and improve accuracy. Keeping an eye on updates from Kyoto University and related space weather agencies will be rewarding for those interested in how space science is advancing satellite safety and technology.