Boundary structure of low-energy ions associated with the nightside convection reversal

Physics

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Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Plasma Convection, Ionosphere: Plasma Temperature And Density, Ionosphere: Polar Cap Ionosphere

Scientific paper

The low-energy H+ data with 6-s resolution from the retarding ion mass spectrometer instrument on DE 1 have been used to reveal an ion boundary structure at midaltitudes that is associated with the nightside convection reversal. The convection reversal provides a free energy source for the perpendicular ion heating that generates ion conics. A detailed analysis of a Y shape distribution observed in the spin-spectrogram (Plates 1-4) shows that the altitude of the ion heating decreases monotonically as latitude decreases along the satellite orbit. This suggests that the convection boundary makes an angle of approximately 3° to 10° with the magnetic field line. Near the convection reversal, the nonlinear transverse heating leads to a local charge separation, which forms a double layer along the boundary. The observations of dc electric field are fitted by a model with a Gaussian charge distribution.

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