Understanding Magnetic Cloud Structure From Shock/Discontinuity Analysis

Lin, Po Hsun; Yang, Ya Hui; Chao, J. K.; Feng, H. Q.; Liu, J. Y.

doi:10.1029/2018ja025225

Cited by 1 publication

(4 citation statements)

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“…To understand the reliability of our scheme in the normal determination, we first reexamine eight Cluster cases in Knetter et al () and compare with their multispacecraft results. We further analyze a few TDs of STEREO B observations presented in Lin et al ().…”

Section: Resultsmentioning

confidence: 99%

“…By adopting the error cone idea presented in Lin et al (), the uncertainty of a DD normal estimation in single‐spacecraft measurements is determined by the deviation of magnetic fields from the normal direction, as represented by the angle ϵ. Namely,

normalϵ = 2 \sqrt{\frac{1}{M} \sum_{α = 1}^{M} {(\sin^{- 1} (\frac{B_{n} ((), α)}{B ((), α)}))}^{2}},

where α = 1, 2, … , M is the index of data points in the period of 2 min before and 2 min after the studied DD.…”

Section: Methodsmentioning

confidence: 99%

“…By adopting the error cone idea presented in Lin et al (2018), the uncertainty of a DD normal estimation in single-spacecraft measurements is determined by the deviation of magnetic fields from the normal direction, as represented by the angle ϵ. Namely,…”

Section: Methodsmentioning

confidence: 99%

“…Since it is essential to find an accurate normal for the interplanetary discontinuities, we propose a new scheme which is modified from a method in Lin et al () used to derive the normal of magnetic cloud boundaries. In this work, we will apply our scheme with additional events to show that using the data on two sides of DDs but not the data within the transition region of DDs to perform cross product can obtain normal directions which are consistent with those derived from multiple spacecraft estimations.…”

Section: Introductionmentioning

confidence: 99%

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Finding the Normal Direction of Interplanetary Directional Discontinuities—A New Scheme

et al. 2019

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Directional discontinuities (DDs) are common structures in the interplanetary space. Correctly determining the normal of a DD is important to understand the changes of phase fronts of magnetic fields adjacent to a discontinuity as well as helpful for the applications in many regimes of space physics research. In this work, we propose a new scheme to estimate the normal directions of DDs by finding the smallest standard deviation of normal magnetic fields derived from the cross product of magnetic fields on both sides of the discontinuity, based on the idea that the phase fronts of the adjacent magnetic fields are closely parallel to the DD plane. By comparing with the normal direction determined from Cluster multiple spacecraft, we show that our scheme can provide the same accuracy as that from the multispacecraft estimation. Moreover, our scheme gives a consistent result of normal estimations at different Cluster spacecraft. We notice that in some cases, the normal directions derived from the minimum variance analysis have large differences between those of multispacecraft method and our scheme implying significant influence of the kinetic effect of particles in the transition region of the discontinuity. A few events of STEREO B observations are further studied to show that our scheme can be applied to DDs in single‐spacecraft measurements with even small rotation of magnetic fields across the discontinuities. With the help of an accurate normal estimation, we can understand the variations of magnetic field phase fronts in the vicinity of discontinuities.

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Section: Resultsmentioning

confidence: 99%