论文信息 - Ion Acceleration in the Magnetotail During the Dipolarization: II Ion Acceleration and Energization

Ion Acceleration in the Magnetotail During the Dipolarization: II Ion Acceleration and Energization

According to the ion distribution functions for the up-flowing O+, H+, and He+ ions found by simulation with the dynamic equation in the dipolarization in the substorm, the ions acceleration and energization are investigated. The results show that, (1) the acceleration and energization mainly occur in the middle of the dipolarization and correspond to a distance of −12RE to −8RE, (2) the acceleration and energization along perpendicular direction are faster than that along parallel direction, (3) variations of velocity and energy for lighter ion are faster than that for heavier ion, (4) the higher the ion initial energy, the faster the ion acceleration will be, and the more energy is obtained by the ions. The ion energy calculated theoretically is as high as −102 keV at the end of the dipolarization in the magnetotail, this is consistent with the observation.

Jiankui Shi | Zhenxian Liu

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