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When these particles drift around the Earth, they do not remain on common field lines unless the geomagnetic field distribution is axially symmetric. This effect has been called "drift shell splitting"... A drift shell is uniquely determined by the coordinate pair(Bm, Lm) as a surface formed by segments of magnetic field lines between conjugate mirror points. Therefore, drift shells which are tangent to one another or cut one another at a given longitude or local time where they have a common segment of field line, generally are separate from one another at a different longitude or local time---in Roederer's terms these drift shells "split". But since these drift shells are different entities from the outset, there is no real need to infer a notion of splitting.  2, fiche 1, Anglais, - shell%20splitting

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In addition to their bounce motion, the trapped particles also drift azimuthally(in longitude) : ions to the west, electrons to the east. It is this drift motion that creates the ring current. The two-dimensional surface that these particles define through their combined bounce and drift motions is known as a "drift shell" or "L shell".  2, fiche 2, Anglais, - drift%20shell

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