We carried out a series of particle simulations to study electron acceleration by Z-mode and whistler-mode waves generated by an electron ring distribution. The electron ring distribution leads to excitations of X-mode waves mainly in the perpendicular direction, Z-mode waves in the perpendicular and parallel directions, and whistler-mode waves mainly in the parallel direction. The parallel Z- and whistler-mode waves can lead to an effective acceleration of ring electrons. The electron acceleration is mainly determined by the wave amplitude and phase velocity, which in turn is affected by the ratio of electron plasma to cyclotron frequencies. For the initial kinetic energy ranging from 100 to 500 keV, the peak energy of the accelerated electrons is found to reach 2-8 times the initial kinetic energy. We further study the acceleration process by test-particle calculations in which electrons interact with one, two, or four waves. The electron trajectories in the one-wave case are simple diffusion curves. In the multi-wave cases, electrons are accelerated simultaneously by counter-propagating waves and can have a higher final energy. (C) 2013 AIP Publishing LLC.
机构:
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USANASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Khazanov, George, V
Ma, Qianli
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Boston Univ, Ctr Space Phys, Boston, MA 02215 USA
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USANASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Ma, Qianli
Chu, Mike
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George Mason Univ, Space Weather Lab, Fairfax, VA 22030 USANASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
机构:
Kyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, JapanKyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, Japan
Omura, Y.
Summers, D.
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Kyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, Japan
Mem Univ Newfoundland, Dept Math & Stat, St John, NB, CanadaKyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, Japan
机构:
NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USANASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Khazanov, George, V
Ma, Qianli
论文数: 0引用数: 0
h-index: 0
机构:
Boston Univ, Ctr Space Phys, Boston, MA 02215 USA
Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA USANASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
Ma, Qianli
Chu, Mike
论文数: 0引用数: 0
h-index: 0
机构:
George Mason Univ, Space Weather Lab, Fairfax, VA 22030 USANASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
机构:
Kyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, JapanKyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, Japan
Omura, Y.
Summers, D.
论文数: 0引用数: 0
h-index: 0
机构:
Kyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, Japan
Mem Univ Newfoundland, Dept Math & Stat, St John, NB, CanadaKyoto Univ, Res Inst Sustainable Humanosphere, Kyoto, Japan