Introducing the Individual Behind the Barometer
Dr. Tony Phillips, an astronomer and writer, believes he has transformed SpaceX’s Starlink satellite network into a form of barometer. Phillips manages spaceweather.com, a website that monitors solar flares, solar winds, and the geomagnetic changes of Earth. On Tuesday, he opened his article with a playful remark: “Starlink has several drawbacks.”
The Drawbacks of Starlink
“The megaconstellation disrupts astronomical observations, contaminates the atmosphere with metallic debris from re-entries, and has brought Low Earth Orbit to the edge of the Kessler Syndrome,” he observes. However, he counters, “Conversely, it serves as a fantastic barometer.”
Comprehending Its Functionality
The concept is quite straightforward: Earth’s atmosphere expands with heat, generally due to an increase in radiation. Most satellites experience a drop in altitude of several meters each day, and as the atmosphere expands, their orbits may decay more rapidly.
The Involvement of the US Space Force
Phillips highlights that the US Space Force closely monitors all artificial satellites, providing data known as “TLEs” regarding their orbits. “Inside each TLE is a drag term known as B* (‘B-star’),” Phillips wrote. “Here’s the catch: the orbit model interpreting a TLE presupposes a constant atmosphere. When the actual atmosphere expands, the satellite decelerates more than anticipated, and the calculated B* must increase to align the orbit with the tracking. B* indicates the final air density.”
Insights from Above
So, what is our esteemed doctor up to? He gathers and examines TLE data for 1,000 Starlink satellites, along with 107 Planet Labs’ SuperDoves, 391 Amazon Kuiper satellites, and 651 Eutelsat OneWeb satellites. Despite their varying altitudes, Phillips has observed them all adjusting in reaction to identical solar activities.
The Rhythm of the Atmosphere
“With this new stream of data, we can observe the atmosphere’s breathing,” he noted. “Solar ultraviolet radiation heats the thermosphere, and the sink rate corresponds with the sun’s 10.7 cm radio flux with a two-day delay: the upper atmosphere takes about two days to respond to a variation in solar activity. Major geomagnetic storms inflate the atmosphere more quickly and create sharp increases in the sink rate.”
A Fresh Perspective on a Familiar Technique
Phillips acknowledges that other researchers have leveraged Starlink for similar investigations, particularly following the 2022 geomagnetic storm that led to the demise of 40 of Elon Musk’s satellites. “What’s innovative here is a continuous, public, daily index featuring three independent constellations corroborating the results,” Phillips expressed. “No specific instrument was launched for this purpose. The swarm itself acts as the sensor, interpreted from publicly available tracking data.”
Conclusion: Dr. Phillips’ Atmospheric Performance
So there you have it, everyone. Dr. Tony Phillips is assigning Starlink satellites a secondary role as a kind of atmospheric forecaster. Who knew that the space debris overhead could reveal so much about our dynamic skies? I don’t know about you, but it’s an exciting blend of science with a hint of clever ingenuity. For more of my straightforward tech commentary, stay tuned to GadgetLad.
