Spatial Scales of the Velocity Shear Layer and Kelvin-Helmholtz Waves on the Magnetopause: First Statistical Results

Yue Zhou; Jih Hong Shue; Hiroshi Hasegawa; Jianyong Lu; Ming Wang; Hanxiao Zhang

doi:10.1029/2021GL097271

Spatial Scales of the Velocity Shear Layer and Kelvin-Helmholtz Waves on the Magnetopause: First Statistical Results

Yue Zhou, Jih Hong Shue, Hiroshi Hasegawa, Jianyong Lu, Ming Wang, Hanxiao Zhang

Department of Space Science and Engineering

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Using data taken by the ARTEMIS spacecraft near Moon, we statistically study the properties of Kelvin-Helmholtz (KH) waves and the thicknesses (Δ_Y) of initial velocity shear layers on the magnetopause at lunar distance. Based on a total of 48 KH wave events and 14 estimates of Δ_Y, the average KH wavelength (λ_X) and Δ_Y are found to be 16.05 R_E and 0.53 R_E at lunar distance, respectively, which are larger than those at near-Earth magnetopause. The λ_X to Δ_Y ratio ranges from 18 to 41 at lunar distance, way beyond the range (6–13) predicted by the linear theory. This result indicates that the KH waves observed at lunar distance are not of the fastest growing mode according to linear theory. This study poses the first statistical study on λ_X and Δ_Y, providing insights into the generation and development of KH waves at lunar distance.

Original language	English
Article number	e2021GL097271
Journal	Geophysical Research Letters
Volume	49
Issue number	4
DOIs	https://doi.org/10.1029/2021GL097271
State	Published - 28 Feb 2022

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title = "Spatial Scales of the Velocity Shear Layer and Kelvin-Helmholtz Waves on the Magnetopause: First Statistical Results",

abstract = "Using data taken by the ARTEMIS spacecraft near Moon, we statistically study the properties of Kelvin-Helmholtz (KH) waves and the thicknesses (ΔY) of initial velocity shear layers on the magnetopause at lunar distance. Based on a total of 48 KH wave events and 14 estimates of ΔY, the average KH wavelength (λX) and ΔY are found to be 16.05 RE and 0.53 RE at lunar distance, respectively, which are larger than those at near-Earth magnetopause. The λX to ΔY ratio ranges from 18 to 41 at lunar distance, way beyond the range (6–13) predicted by the linear theory. This result indicates that the KH waves observed at lunar distance are not of the fastest growing mode according to linear theory. This study poses the first statistical study on λX and ΔY, providing insights into the generation and development of KH waves at lunar distance.",

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T1 - Spatial Scales of the Velocity Shear Layer and Kelvin-Helmholtz Waves on the Magnetopause

T2 - First Statistical Results

AU - Zhou, Yue

AU - Shue, Jih Hong

AU - Hasegawa, Hiroshi

AU - Lu, Jianyong

AU - Wang, Ming

AU - Zhang, Hanxiao

PY - 2022/2/28

Y1 - 2022/2/28

N2 - Using data taken by the ARTEMIS spacecraft near Moon, we statistically study the properties of Kelvin-Helmholtz (KH) waves and the thicknesses (ΔY) of initial velocity shear layers on the magnetopause at lunar distance. Based on a total of 48 KH wave events and 14 estimates of ΔY, the average KH wavelength (λX) and ΔY are found to be 16.05 RE and 0.53 RE at lunar distance, respectively, which are larger than those at near-Earth magnetopause. The λX to ΔY ratio ranges from 18 to 41 at lunar distance, way beyond the range (6–13) predicted by the linear theory. This result indicates that the KH waves observed at lunar distance are not of the fastest growing mode according to linear theory. This study poses the first statistical study on λX and ΔY, providing insights into the generation and development of KH waves at lunar distance.

AB - Using data taken by the ARTEMIS spacecraft near Moon, we statistically study the properties of Kelvin-Helmholtz (KH) waves and the thicknesses (ΔY) of initial velocity shear layers on the magnetopause at lunar distance. Based on a total of 48 KH wave events and 14 estimates of ΔY, the average KH wavelength (λX) and ΔY are found to be 16.05 RE and 0.53 RE at lunar distance, respectively, which are larger than those at near-Earth magnetopause. The λX to ΔY ratio ranges from 18 to 41 at lunar distance, way beyond the range (6–13) predicted by the linear theory. This result indicates that the KH waves observed at lunar distance are not of the fastest growing mode according to linear theory. This study poses the first statistical study on λX and ΔY, providing insights into the generation and development of KH waves at lunar distance.

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Spatial Scales of the Velocity Shear Layer and Kelvin-Helmholtz Waves on the Magnetopause: First Statistical Results

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