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If Earth had rings (Read 13163 times)
Tony
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Re: If Earth had rings
Reply #15 - 01/13/13 at 21:40:51
 
You need to find out the distance at which the tidal force trying to rip the object apart is greater than the object's gravity that is holding it together.  Wikipedia has a nice article on how to do it:
http://en.wikipedia.org/wiki/Roche_limit#Derivation_of_the_formula_2
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frankuitaalst
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Re: If Earth had rings
Reply #16 - 01/16/13 at 13:38:12
 
As mentionned above Earth Rings don't stay in their original plane . Hereunder is an animation which shows the inclination evolation in time as a function of distance from Earth .  
The timespan is about 350 years .  
Originally all particles were set at moons inclination ( 5) . Moreover the LAN was set to the LAN of the moon .  
Due to perturbations the inclintions rise  . It's no wonder that particles further away exhibit stronger perturbations .  
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EarthRingsIncl5DegreesInclination350y.gif
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frankuitaalst
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Re: If Earth had rings
Reply #17 - 01/16/13 at 13:44:32
 
What's more : even the LAN ( longitude  of ascending node ) doesn't stay synchronised with the LAN of the moon .  
THe mmon itself has a LAN oscillation of about 18.6 years .  
The animation herunder shows the LAN variation in time . Originally all partickes had a LAN of about 355 .  
 
If we combine all parameters it may be obvious that a ring structure around Earth evolves very quickly to a wavy cloud like structure .
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« Last Edit: 01/17/13 at 14:10:22 by frankuitaalst »  

EarthRings5DegIncl_LANAnim.gif
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