Volume 21 Issue 3
Aug.  2001
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ZONG Qiugang, PU Zuyin, HUANG Zongying, FU Suiyan, B. Wilken. ESCAPE OF MAGNETOSPERIC O+ OXYGEN IONS INTO THE MAGNETOSHEATH:MECHANISM AND EFFECTS[J]. Chinese Journal of Space Science, 2001, 21(3): 219-229.
Citation: ZONG Qiugang, PU Zuyin, HUANG Zongying, FU Suiyan, B. Wilken. ESCAPE OF MAGNETOSPERIC O+ OXYGEN IONS INTO THE MAGNETOSHEATH:MECHANISM AND EFFECTS[J]. Chinese Journal of Space Science, 2001, 21(3): 219-229.

ESCAPE OF MAGNETOSPERIC O+ OXYGEN IONS INTO THE MAGNETOSHEATH:MECHANISM AND EFFECTS

  • Received Date: 2000-12-05
  • Rev Recd Date: 2001-05-08
  • During the magnetic storm of January 10, 1997, Geotail spacecraft observed a mgnetospheric O+ burst event just on the outside of the dayside magnetopause. Energetic oxygen ions were seen to flow downward in the magnetosheath. The appearance of this O+ burst event was in close connection with the strong southward interplanetary magnetic field. The Principle Axis Analysis (PAA) indicates that the dayside magnetopause during this time period was a rotational discontinuity, magnetic reconnection took place in the magnetopause current sheet. Observations showed that reconnection was of the quasi-steady state type and that the O+ flow has a southward component. Both normal and inverse energy (velocity) dispersion were seen in the O+ flux enhancement process which were caused by the Time Of Fly (TOF) effect of oxygen ions escaping along the reconnected magnetic field lines. Only O+ can be transported by the gradient drift from the magnetosphere into the reconnection region, therefore they can be continuously detected in the magnetosheath. The escape rate of O+ in this event is estimated to be 0.61 × 1023 s-1, which was approximately 33% of the total input rate of the ring current oxygen ions. It is the escape of a great number of oxygen ions from the duskside of the inner magnetosphere (ring current region) that leads to the pronounced asymmetry in the ring current ASY-H index.

     

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