Preprints
https://doi.org/10.5194/angeo-2022-20
https://doi.org/10.5194/angeo-2022-20
 
30 Aug 2022
30 Aug 2022
Status: this preprint is currently under review for the journal ANGEO.

Width of Plasmaspheric Plumes Related to the Intensity of Geomagnetic Storm

Zhanrong Yang1,2, Haimeng Li1,2, Zhigang Yuan3, Zhihai Ouyang1,2, and Xiaohua Deng1 Zhanrong Yang et al.
  • 1Department of Physics, School of Physics and Materials, Nanchang University, Nanchang 330031, China
  • 2Institute of Space Science and Technology, Nanchang University, Nanchang 330031, China
  • 3School of Electronic Information, Wuhan University, Wuhan, China

Abstract. The plume is a plasma region in the magnetosphere that is detached from the main plasmasphere. It significantly contributes to the dynamic processes in both the inner and outer magnetosphere. In this paper, using Van Allen Probe A, the correlation between plume width and the intensity of a geomagnetic storm is studied. First, through the statistical analysis of all potential plume events, we find that there is almost no correlation between plume width and the intensity of geomagnetic storms. However, for the plumes in the recovery phase after improved sifting, it seems that there is a negative correlation between the plume width and the absolute value of minimum Dst during a storm. Utilizing test particle simulations, we study the dynamic evolution patterns of plumes during two geomagnetic storms. The simulated structures of the two plasmaspheric plumes are roughly consistent with the structures observed by the Van Allen Probe A. This result suggests that the plasmaspheric particles escape quickly during intense geomagnetic storms, causing the width of the plume to be relatively narrow during the recovery phase of intense geomagnetic storms. These results are helpful for understanding the dynamic evolution of the plasmasphere and plume during geomagnetic storms.

Zhanrong Yang et al.

Status: open (until 15 Oct 2022)

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Zhanrong Yang et al.

Zhanrong Yang et al.

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Short summary
Through the statistical analysis of potential plasmaspheric plume, we find that there is almost no correlation between plume width and the intensity of geomagnetic storms. However, for the plumes in the recovery phase after improved sifting, there is a negative correlation between the plume width and the absolute value of minimum Dst duringstorm. We suggest that the plasmaspheric particles may escape quickly during intense storms, causing plume to be relatively narrow during the recovery phase.