Preprints
https://doi.org/10.5194/angeo-2020-86
https://doi.org/10.5194/angeo-2020-86

  28 Dec 2020

28 Dec 2020

Review status: a revised version of this preprint is currently under review for the journal ANGEO.

A New Perspective and Explanation to the Formation of Plasmaspheric Shoulder Structure

Hua Zhang1, Guangshuai Peng1, and Chao Shen2 Hua Zhang et al.
  • 1Institute of Space Weather, Nanjing University of Information Science & Technology, Nanjing, China
  • 2Harbin Institute of Technology, Shen Zhen, China

Abstract. Over the hours of 5–9 UT on June 8 2001, the extreme ultraviolet (EUV) instrument onboard IMAGE satellite observed a Shoulder-like formation in the morning sector and a Plume-like structure straddling in the between noon and dusk region. Simulation results of the plasmapause formation based on mechanism of drift motion called Test Particle Model (TPM) and have reproduced various plasmapause structures and subsequent evolution of the Shoulder. The analysis indicated that the Shoulder is created by a dawn-dusk convection electric field intensity, sharp reduction and spatial nonuniform manifested. As, combination of the plasmaspheric rotation rate speed up with L-shell increase and plasma flux do radial outflow in the predawn sector to interact, and produce an asymmetric bulge that rotates eastward. The Shoulder-like structure rotates sunward and develops to the single or double Plume structure during active times.

Hua Zhang et al.

 
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Hua Zhang et al.

Hua Zhang et al.

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Short summary
In this paper, we propose a new explanation to the formation of Shouder-like based on Test Particle Model. The simulation reproduce three Shoulder in a substorm case. The physical explanation of Shoulder formation is not yet understood. The paper suggest that the physical mechanism of Shoulder formation is the result of plasma extrusion in the predawn sector, caused by outer plasmasphere drifts radial outward and rotates faster. the single or double Plumes appear derives from the 279 Shoulder.