Stuff To Blow Your Mind From the Vault: The Burning Mountains of Io, Part 3
Feb 14, 2026
A deep dive into Io's volcanism and recent findings about its interior structure. They unpack Juno flyby measurements and the debate over a global magma ocean versus local magma chambers. Vivid descriptions of massive plumes and how Io supplies Jupiter's plasma torus. Tangents include myths about explosive launches, Project Orion ideas, and Io's outsized role in the Jovian system.
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Measuring Io's Flex With Doppler Shifts
- Juno's close flybys used Deep Space Network Doppler shifts to measure tiny changes in spacecraft acceleration.
- Those measurements reveal how rigid or flexible Io is under Jupiter's tidal forces.
Tidal Flexing Powers Io's Heat
- Io's elliptical orbit and orbital resonances with Europa and Ganymede drive intense tidal flexing.
- That repeated squeezing converts gravitational energy into the internal heat powering Io's volcanism.
Fork-Bending Analogy For Tidal Heating
- Joe recalled kids bending metal forks to heat them by flexing, illustrating frictional heating.
- He compared that to Io's interior heating from tidal flexing by Jupiter.
