Field Line Curvature Scattering in the Dayside Off-Equatorial Minima Regions
arxiv(2024)
摘要
Magnetic field line curvature (FLC) scattering is an effective mechanism for
collisionless particle scattering. In the terrestrial magnetosphere, the FLC
scattering plays an essential role in shaping the outer boundary of protons
radiation belt, the rapid decay of ring current, and the formation of proton
isotropic boundary (IB). However, previous studies have yet to adequately
investigate the influence of FLC scattering on charged particles in the Earth's
dayside magnetosphere, particularly in the off-equatorial magnetic minima
regions. This study employs T89 magnetic field model to investigate the impacts
of FLC scattering on ring current protons in the dayside magnetosphere, with a
specific focus on the off-equatorial minimum regions. We analyze the spatial
distributions of single and dual magnetic minima regions, adiabatic parameter,
and pitch angle diffusion coefficients due to FLC scattering as functions of
Kp. The results show that the effects of FLC scattering are significant not
only on the dusk and dawn sides but also in the off-equatorial minima regions
on the noon. Additionally, we investigate the role of dipole tilt angle in the
hemispheric asymmetry of FLC scattering effects. The dipole tilt angle controls
the overall displacement of the dayside magnetosphere, resulting in different
FLC scattering effects in the two hemispheres. Our study holds significance for
understanding the FLC scattering effects in the off-equatorial region of
Earth's dayside magnetosphere and for constructing a more accurate dynamic
model of particles.
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