Except for world entry to cat movies, the presence of 1000’s of Starlink broadband web entry satellites in LEO has a really nice facet impact for atmospheric researchers. Starlink publicly publishes near-real-time ephemeris knowledge on its particular person satellites. From this knowledge you possibly can deduce many particulars in regards to the environment at that altitude, together with its density at particular altitudes at particular instances, data which in any other case can be very onerous to collect. Not too long ago, this allowed [Mamoru Yamamoto] to find out the density of the thermosphere utilizing tomography.
In a similar 2025 paper by [Zhuoliang Ou] et al. as printed in Distant Sensing, this similar knowledge supply was used to research particulars of the thermosphere. With Starlink publishing this knowledge since 2021, this gives a useful dataset for learning this outermost a part of the environment.
Commencing simply earlier than the widely acknowledged transition into ‘house’ at 100 km altitude and beneath the Earth’s exosphere, the thermosphere‘s thickness fluctuates resulting from components like photo voltaic irradiation and, with it, the precise altitude at which the exosphere begins. Typically, although, it’s properly above 600 km altitude. This locations Starlink satellites in addition to each energetic house stations (ISS and Tiangong) within the thermosphere.
[Zuholiang Ou] et al. established that the Starlink knowledge matches properly with that from a devoted analysis satellite tv for pc like SWARM-B, thus making it a helpful supply of scientific knowledge.
The innovation in [Yamamoto-san]’s paper is that as an alternative of utilizing the standard two-line ingredient (TLE) set, a extra complete tomographic strategy was used, which basically makes use of extra knowledge for a bigger reconstruction, with the decision claimed to be about on par with that of the SWARM satellites. This means that though these Starlink satellites had been by no means designed to be greater than knowledge relays, they could have by accident grow to be the most important improvement in thermospheric analysis in a very long time.
In fact, you can’t please everyone.
