by johnnydeep » Sun Dec 11, 2022 8:32 pm
What's the significance of this statement, if any, to the tidal friction - "damps wobbles caused by Jupiter's other Galilean moons"? I would think any "wobble" would only contribute to
increasing the effect of tidal friction!
I do read at Wikipedia the following:
https://en.wikipedia.org/wiki/Io_(moon)#Tidal_heating wrote:Unlike Earth and the Moon, Io's main source of internal heat comes from tidal dissipation rather than radioactive isotope decay, the result of Io's orbital resonance with Europa and Ganymede.[48] Such heating is dependent on Io's distance from Jupiter, its orbital eccentricity, the composition of its interior, and its physical state.[85] Its Laplace resonance with Europa and Ganymede maintains Io's eccentricity and prevents tidal dissipation within Io from circularizing its orbit. The resonant orbit also helps to maintain Io's distance from Jupiter; otherwise tides raised on Jupiter would cause Io to slowly spiral outward from its parent planet.[89] The tidal forces experienced by Io are about 20,000 times stronger than the tidal forces Earth experiences due to the Moon, and the vertical differences in its tidal bulge, between the times Io is at periapsis and apoapsis in its orbit, could be as much as 100 m (330 ft).[90] The friction or tidal dissipation produced in Io's interior due to this varying tidal pull, which, without the resonant orbit, would have gone into circularizing Io's orbit instead, creates significant tidal heating within Io's interior, melting a significant amount of Io's mantle and core.
Does the mentioned "wobble dampening" refer to any of that, or something else?
[quote="APOD Robot" post_id=327714 time=1670735241 user_id=128559]
[url=https://apod.nasa.gov/apod/ap221211.html] [img]https://apod.nasa.gov/apod/calendar/S_221211.jpg[/img] [size=150]Io in True Color[/size][/url]
[b] Explanation: [/b] The strangest moon in the [url=https://solarsystem.nasa.gov/solar-system/our-solar-system/in-depth/]Solar System[/url] is bright yellow. The [url=https://photojournal.jpl.nasa.gov/catalog/PIA02308]featured picture[/url], an attempt to show how Io would appear in the "true colors" perceptible to the average human eye, was taken in 1999 July by the [url=https://en.wikipedia.org/wiki/Galileo_(spacecraft)]Galileo spacecraft[/url] that orbited Jupiter from 1995 to 2003. Io's colors derive from [url=http://periodic.lanl.gov/16.shtml]sulfur[/url] and molten [url=https://en.wikipedia.org/wiki/Silicate_mineral]silicate rock[/url]. The unusual [url=https://solarsystem.nasa.gov/moons/jupiter-moons/io/in-depth/#otp_surface]surface of Io[/url] is kept very young by its system of [url=https://apod.nasa.gov/apod/ap960805.html]active volcanoes[/url]. The intense [url=https://en.wikipedia.org/wiki/Tidal_force]tidal gravity[/url] of [url=https://solarsystem.nasa.gov/planets/jupiter/in-depth/]Jupiter[/url] stretches [url=https://youtu.be/GkfDnIQsEXs]Io[/url] and damps wobbles caused by Jupiter's other [url=https://apod.nasa.gov/apod/ap001118.html]Galilean moons[/url]. The resulting [url=https://en.wikipedia.org/wiki/Friction]friction[/url] greatly heats [url=http://en.wikipedia.org/wiki/Io_%28moon%29]Io[/url]'s interior, causing [url=https://apod.nasa.gov/apod/ap070918.html]molten rock[/url] to explode through the surface. [url=http://www.youtube.com/watch?v=GdkOngxCqQo]Io's volcanoes[/url] are so active that they are effectively turning the whole moon inside out. Some of [url=https://apod.nasa.gov/apod/ap070211.html]Io[/url]'s volcanic lava is so hot it [url=https://ui.adsabs.harvard.edu/abs/1998Icar..135..181M/abstract]glows in the dark[/url].
[/quote]
What's the significance of this statement, if any, to the tidal friction - "damps wobbles caused by Jupiter's other Galilean moons"? I would think any "wobble" would only contribute to [b][i]increasing [/i][/b]the effect of tidal friction!
I do read at Wikipedia the following:
[quote=https://en.wikipedia.org/wiki/Io_(moon)#Tidal_heating]Unlike Earth and the Moon, Io's main source of internal heat comes from tidal dissipation rather than radioactive isotope decay, the result of Io's orbital resonance with Europa and Ganymede.[48] Such heating is dependent on Io's distance from Jupiter, its orbital eccentricity, the composition of its interior, and its physical state.[85] Its Laplace resonance with Europa and Ganymede maintains Io's eccentricity and prevents tidal dissipation within Io from circularizing its orbit. The resonant orbit also helps to maintain Io's distance from Jupiter; otherwise tides raised on Jupiter would cause Io to slowly spiral outward from its parent planet.[89] The tidal forces experienced by Io are about 20,000 times stronger than the tidal forces Earth experiences due to the Moon, and the vertical differences in its tidal bulge, between the times Io is at periapsis and apoapsis in its orbit, could be as much as 100 m (330 ft).[90] The friction or tidal dissipation produced in Io's interior due to this varying tidal pull, which, without the resonant orbit, would have gone into circularizing Io's orbit instead, creates significant tidal heating within Io's interior, melting a significant amount of Io's mantle and core.[/quote]
Does the mentioned "wobble dampening" refer to any of that, or something else?