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Categorization of electron isotropy boundary patterns: ELFIN and POES observations. / Artemyev, Anton; Сергеев, Виктор Андреевич; Angelopoulos, V.; Wilkins, C.; Zhang, X. J.

In: Journal of Geophysical Research: Space Physics, Vol. 129, No. 11, e2024JA033231, 30.11.2024.

Research output: Contribution to journalArticlepeer-review

Harvard

Artemyev, A, Сергеев, ВА, Angelopoulos, V, Wilkins, C & Zhang, XJ 2024, 'Categorization of electron isotropy boundary patterns: ELFIN and POES observations', Journal of Geophysical Research: Space Physics, vol. 129, no. 11, e2024JA033231. https://doi.org/10.1029/2024JA033231

APA

Artemyev, A., Сергеев, В. А., Angelopoulos, V., Wilkins, C., & Zhang, X. J. (2024). Categorization of electron isotropy boundary patterns: ELFIN and POES observations. Journal of Geophysical Research: Space Physics, 129(11), [e2024JA033231]. https://doi.org/10.1029/2024JA033231

Vancouver

Artemyev A, Сергеев ВА, Angelopoulos V, Wilkins C, Zhang XJ. Categorization of electron isotropy boundary patterns: ELFIN and POES observations. Journal of Geophysical Research: Space Physics. 2024 Nov 30;129(11). e2024JA033231. https://doi.org/10.1029/2024JA033231

Author

Artemyev, Anton ; Сергеев, Виктор Андреевич ; Angelopoulos, V. ; Wilkins, C. ; Zhang, X. J. / Categorization of electron isotropy boundary patterns: ELFIN and POES observations. In: Journal of Geophysical Research: Space Physics. 2024 ; Vol. 129, No. 11.

BibTeX

@article{6d9bf1de99a643b19553b5d9d189dd36,
title = "Categorization of electron isotropy boundary patterns: ELFIN and POES observations",
abstract = "Magnetic field-line curvature scattering (FLCS) of energetic particles in the equatorial magnetotail results in isotropization of pitch-angle distributions, loss-cone filling, and precipitation above a minimum energy at a given latitude. At a fixed energy, the lowest latitude of isotropization is the isotropy boundary (IB) for that energy. Nominally, the IB (latitude) exhibits a characteristic energy dependence due to the monotonic variation of the equatorial magnetic field intensity with radial distance. Deviations from this nominal IB dispersion can occur if the radial variation (spatial or temporal) is non-mononotic and/or if other precipitation mechanisms prevail. With its sensitive and detailed measurements of electron spectra up to relativistic energies, ELFIN's recent observations reveal a variety of electron IBe patterns near magnetic midnight which are repeatable enough to warrant classification. This study aims to categorize the various IBe patterns observed by ELFIN's high-fidelity but short lived dataset (a few months), compare them with simultaneous nearby POES observations, which are made with a limited energy coverage and resolution but last for decades, and discuss their possible interpretation. The general agreement between ELFIN and POES IB observations indicate a relatively large-scale nature of IBe patterns. Surprisingly, there exists a large number (up to 2/3 of all events) of non-monotonic-or steep/multiple-IB patterns. This suggest an abundance of non-trivial tail current sheet structures or a mixed contribution of two mechanisms in the vicinity of IBe in these cases.",
keywords = "electron precipitations, isotropy boundary, magnetotail current sheet",
author = "Anton Artemyev and Сергеев, {Виктор Андреевич} and V. Angelopoulos and C. Wilkins and Zhang, {X. J.}",
year = "2024",
month = nov,
day = "30",
doi = "10.1029/2024JA033231",
language = "English",
volume = "129",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
publisher = "Wiley-Blackwell",
number = "11",

}

RIS

TY - JOUR

T1 - Categorization of electron isotropy boundary patterns: ELFIN and POES observations

AU - Artemyev, Anton

AU - Сергеев, Виктор Андреевич

AU - Angelopoulos, V.

AU - Wilkins, C.

AU - Zhang, X. J.

PY - 2024/11/30

Y1 - 2024/11/30

N2 - Magnetic field-line curvature scattering (FLCS) of energetic particles in the equatorial magnetotail results in isotropization of pitch-angle distributions, loss-cone filling, and precipitation above a minimum energy at a given latitude. At a fixed energy, the lowest latitude of isotropization is the isotropy boundary (IB) for that energy. Nominally, the IB (latitude) exhibits a characteristic energy dependence due to the monotonic variation of the equatorial magnetic field intensity with radial distance. Deviations from this nominal IB dispersion can occur if the radial variation (spatial or temporal) is non-mononotic and/or if other precipitation mechanisms prevail. With its sensitive and detailed measurements of electron spectra up to relativistic energies, ELFIN's recent observations reveal a variety of electron IBe patterns near magnetic midnight which are repeatable enough to warrant classification. This study aims to categorize the various IBe patterns observed by ELFIN's high-fidelity but short lived dataset (a few months), compare them with simultaneous nearby POES observations, which are made with a limited energy coverage and resolution but last for decades, and discuss their possible interpretation. The general agreement between ELFIN and POES IB observations indicate a relatively large-scale nature of IBe patterns. Surprisingly, there exists a large number (up to 2/3 of all events) of non-monotonic-or steep/multiple-IB patterns. This suggest an abundance of non-trivial tail current sheet structures or a mixed contribution of two mechanisms in the vicinity of IBe in these cases.

AB - Magnetic field-line curvature scattering (FLCS) of energetic particles in the equatorial magnetotail results in isotropization of pitch-angle distributions, loss-cone filling, and precipitation above a minimum energy at a given latitude. At a fixed energy, the lowest latitude of isotropization is the isotropy boundary (IB) for that energy. Nominally, the IB (latitude) exhibits a characteristic energy dependence due to the monotonic variation of the equatorial magnetic field intensity with radial distance. Deviations from this nominal IB dispersion can occur if the radial variation (spatial or temporal) is non-mononotic and/or if other precipitation mechanisms prevail. With its sensitive and detailed measurements of electron spectra up to relativistic energies, ELFIN's recent observations reveal a variety of electron IBe patterns near magnetic midnight which are repeatable enough to warrant classification. This study aims to categorize the various IBe patterns observed by ELFIN's high-fidelity but short lived dataset (a few months), compare them with simultaneous nearby POES observations, which are made with a limited energy coverage and resolution but last for decades, and discuss their possible interpretation. The general agreement between ELFIN and POES IB observations indicate a relatively large-scale nature of IBe patterns. Surprisingly, there exists a large number (up to 2/3 of all events) of non-monotonic-or steep/multiple-IB patterns. This suggest an abundance of non-trivial tail current sheet structures or a mixed contribution of two mechanisms in the vicinity of IBe in these cases.

KW - electron precipitations

KW - isotropy boundary

KW - magnetotail current sheet

UR - https://www.mendeley.com/catalogue/9a9e985f-6d2e-365d-bd9f-4b3e6ed3e20f/

U2 - 10.1029/2024JA033231

DO - 10.1029/2024JA033231

M3 - Article

VL - 129

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 11

M1 - e2024JA033231

ER -

ID: 128114559