1984
DOI: 10.1029/ja089ia12p10763 View full text |Buy / Rent full text
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Abstract: The properties of the drift compressional instability in the magnetosphere with a two-component plasma are examined by using gyrokinetic theory. A dipole field is used to approximate the equilibrium geomagnetic field. In contrast to the slab model it is found that electrons of the hot component have a stabilizing effect on the mode excited by the protons. With appropriate values of various parameters, the wave periods in the range of 30-200 s are obtained from numerical calculations of the model. The drift com… Show more

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“…Although the drift-bounce resonance is supported by some satellite observations, there are other possible mechanisms to excite storm time Pc5 waves including the drift-mirror (Hasegawa, 1969), the ballooning (Ohtani & Tamao, 1993), and the drift-compressional instability (Ng et al, 1984). Also, the theoretical studies of the drift-bounce resonance assume the simplified situation such as locally homogeneous parameters, and excitation efficiency in more realistic 3-D structure is far from understood due to the difficulty of nonlinear global simulations.…”
Section: 1029/2018gl081573mentioning
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“…Although the drift-bounce resonance is supported by some satellite observations, there are other possible mechanisms to excite storm time Pc5 waves including the drift-mirror (Hasegawa, 1969), the ballooning (Ohtani & Tamao, 1993), and the drift-compressional instability (Ng et al, 1984). Also, the theoretical studies of the drift-bounce resonance assume the simplified situation such as locally homogeneous parameters, and excitation efficiency in more realistic 3-D structure is far from understood due to the difficulty of nonlinear global simulations.…”
Section: 1029/2018gl081573mentioning
“…(83) appears when the plasma inhomogeneity is taken into account. This oscillation branch is called the drift compressive mode (Ng et al 1984;Crabtree and Chen 2004;Porazik and Lin 2011). Its characteristic frequency is of the same order as the plasma diamagnetic drift frequency,…”
Section: Drift Compressive Modesmentioning
“…Linear theories of internally driven hydromagnetic instabilities have been presented in terms of (1) mirror or drift mirror instabilities due to pressure anisotropy [Hasegawa, 1969;Pokhotelov et al, 1986;Cheng and Lin, 1987], (2) drift compressional instabilities due to pressure nonuniformity [Hasegawa, 1971;Ng et al, 1984] and (3) trapped particle bounce and magnetic drift resonance excitation of ULF waves [Southwood, 1976;Chen and Hasegawa, 1991]. Global wave solutions can be obtained from two coupled kinetic-MHD eigenmode equations [Cheng and Lin, 1987;Cheng, 1991] which describe the coupling between the transverse and the compressional magnetic field components.…”
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