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On earth, the ion cyclotron and ion collision frequency ratio is 1 at roughly 118 km, and this is used as one of the definitions of the limit to space.

What are ion cyclotron frequency and ion collision rate, and why is this relevant?

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  • $\begingroup$ Please add the [karman-line] tag. Thanks! $\endgroup$
    – DrSheldon
    Aug 6 '18 at 13:59
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    $\begingroup$ Isn't the Karman Line a completely different edge-of-space definition? $\endgroup$
    – Erin Anne
    Aug 6 '18 at 20:46
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    $\begingroup$ I've added a link, hope you don't mind. It's a good question! But I'm not sure what "What are those" means. Are you asking for explanations of what ion cyclotron frequency and ion collision frequency (rate) mean, or asking for other definitions of the "limit to space"? $\endgroup$
    – uhoh
    Aug 7 '18 at 1:12
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    $\begingroup$ I am asking about ion cyclotron/collision $\endgroup$
    – sp2danny
    Aug 7 '18 at 4:49
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    $\begingroup$ @sp2danny Thanks! Can you double check if my edit is correct? Since comments should be considered temporary, it's best to make clarifications permanent in the original post. $\endgroup$
    – uhoh
    Aug 7 '18 at 7:51

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