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Space Weather Impact

Thermospheric Satellite Drag & Orbital Decay Analyzer

Geomagnetic activity — tracked here via the real, live Kp index — is a genuine, physically direct driver of atmospheric drag on satellites.

Kp index (live)

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QUIET

NOAA SWPC

Geomagnetic storms deposit energy into Earth's upper atmosphere, heating and expanding the thermosphere — the same layer where the International Space Station and most low-Earth-orbit satellites operate. That expansion increases atmospheric density at a given altitude, which in turn increases aerodynamic drag on orbiting spacecraft.

How it works

The Kp index is a genuine, direct, real-time proxy for this effect: higher Kp corresponds to more geomagnetic energy input and, correspondingly, more thermospheric heating and expansion. Increased drag causes satellites to lose altitude faster than normal, complicating orbit prediction — this is one of the real, practical reasons operators watch geomagnetic activity closely, independent of any effect on the satellite's electronics.