  We derive the expression for the ponderomotive force in the real
multicomponent magnetospheric plasma containing heavy ions. The ponderomotive
force considered includes the induced magnetic moment of all the species and
arises due to inhomogeneity of the traveling low-frequency electromagnetic wave
amplitude in the nonuniform medium. The nonlinear stationary force balance
equation is obtained taking into account the gravitational and centrifugal
forces for the plasma consisting of the electrons, protons and heavy ions
(He$^{+}$). The background geomagnetic field is taken for the dayside of the
magnetosphere, where the magnetic field have magnetic "holes" (Antonova and
Shabansky 1968). The balance equation is solved numerically to obtain the
nonlinear density distribution of ions (H$^{+}$) in the presence of heavy ions
(He$^{+}$). It is shown that for frequencies less than the helium gyrofrequency
at the equator the nonlinear plasma density perturbations are peaked in the
vicinity of the equator due to the action of the ponderomotive force. A
comparison of the cases of the dipole and dayside magnetosphere is provided. It
is obtained that the presence of heavy ions leads to decrease of the proton
density modification.
