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A theoretical analysis of magnetic field effects on the Friedel-Kohn "wiggle" contribution to shielding by a quantum plasma is carried out here for conditions of intermediate magnetic field strength (EF > hw, > KT). In this case, magnetic field quantum corrections to the Friedel-Kohn "wiggle" may be expected to be of two types: (1) monotonic magnetic field corrections associated with an expansion in powers of fi w,/& and (2) DHVA-type oscillatory magnetic field corrections associated with oscillatory terms involving the DHVA oscillation frequency E.&J,.
The analysis of the monotonic magnetic field corrections is carried out with an expansion in powers of hw,/EF , and we find that the actual expansion parameter involved is not hw,/EF which is small; but rather it is [(fzw,/E~) .PFY] which may be either small or large since pFr is large. For distances from the shielded impurity such that [(fiw,/EF) .pfr] < I, the power expansion is valid and the zero-field Friedel-Kohn "wiggle" is the dominant high-wavenumber shielding phenomenon, with monotonic and anisotropic.
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