Elsasser number

The Elsasser number, Λ, is a dimensionless number in magnetohydrodynamics that represents the ratio of magnetic forces to the Coriolis force.[1]

where σ is the conductivity of the fluid, B is the magnetic field, ρ is the density of the fluid, and Ω is the rate of rotation of the body.

Notes
  1. Encyclopedia of geomagnetism and paleomagnetism, p. 299
gollark: You can replace `fs.open`, `fs.isReadOnly`, `fs.move`, `fs.delete` and probably 18251826512918 other functions, and that will stop most programs from doing things to them, *but* you can then probably get around that with various tricks.
gollark: > acctualy no is there a way to make some folders / files read only and read and write again with an api or something?This is technically possible™ but fairly hard™.
gollark: `os.startTimer`
gollark: And then check if an event is the timer, or a modem message.
gollark: Er, you can queue timer events.

References
  • Gubbins, David, and Emilio Herrero-Bervera, eds. Encyclopedia of geomagnetism and paleomagnetism. Springer Science & Business Media, 2007.


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