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Chinese Journal of Space Science ›› 2014, Vol. 34 ›› Issue (6): 794-801.doi: 10.11728/cjss2014.06.794

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Nonadiabatic acceleration of protons in the near-earth magnetotail during substorm dipolarization

Meng Xuejie, Cao Jinbin, Wang Tieyan, Ma Yuduan   

  1. School of Astronautics, Beihang University, Beijing 100191
  • Received:2013-11-28 Revised:2014-04-09 Online:2014-10-15 Published:2014-10-31

Abstract:

Using test particle simulation, the acceleration of -Re~-5Re magnetotail protons is studied during substorm-associated dipolarization events. The effects of the ultra-low frequency waves on the proton acceleration process in the vicinity of equatorial plane are investigated. It is shown that particles are injected earthward during dipolarization. Protons with relatively low initial energies may not conserve their magnetic moment, and they are nonadiabatically accelerated by the electromagnetic wave whose frequency is close to the proton gyrofrequency. In addition, the final energies of the particles after the event are related to its initial energies at the dipolarization onset. For the protons whose initial energies are much lower than the cutoff energy, their energies are increased significantly after the event. The particles' energy increase have the same order of magnitude with the O+ ions' in the dipolarization process, and it is related to the electromagnetic wave frequencies. However, for the protons whose initial energies are higher than the cutoff energy, their final energy level is not influenced by the wave and the energies are stable during the injection.

Key words: Substorm, Dipolarization, Nonadiabatic acceleration

CLC Number: