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I Calculating the curvature drift in a plasma

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  1. May 24, 2018 #1
    How do i get this equation,
    $$\frac{db}{dl}=(\hat{B}.∇)\hat{b}$$

    This equation is a vector whose direction is towards the centre of the circle which most closely approximates the magnetic field-line at a given point, and whose magnitude is the inverse of the radius of this circle.

    However I have no idea how to obtain the above and the source basically state it as by definition. Where is this equation obtained from?

    Source: https://ocw.mit.edu/courses/nuclear...a-physics-i-fall-2003/lecture-notes/chap2.pdf page 8
     
  2. jcsd
  3. May 29, 2018 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
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