Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase

Y. Kazama; H. Kojima; Y. Miyoshi; Y. Kasahara; S. Kasahara; H. Usui; B. J. Wang; S. Y. Wang; S. W.Y. Tam; T. F. Chang; K. Asamura; Y. Kasaba; S. Matsuda; M. Shoji; A. Matsuoka; M. Teramoto; T. Takashima; I. Shinohara

doi:10.1029/2020GL090522

Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase

Y. Kazama, H. Kojima, Y. Miyoshi, Y. Kasahara, S. Kasahara, H. Usui, B. J. Wang, S. Y. Wang, S. W.Y. Tam, T. F. Chang, K. Asamura, Y. Kasaba, S. Matsuda, M. Shoji, A. Matsuoka, M. Teramoto, T. Takashima, I. Shinohara

SCI - Planetary Plasma and Atmospheric Research Center (PPARC)

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

Abstract

This report describes electron beams observed at high latitudes in the magnetosphere by the Arase satellite. According to fine angular channel measurements, beam electrons are mainly flowing away from the Earth, and are well collimated to within a few degrees. A statistical study indicates that the beams are seen when Arase is located at L_m > ∼5, and more frequently as the magnetosphere becomes active. The field lines of the beam events are traced back to the typical auroral ovals. The statistical properties of the beams are consistent with the interpretation that ionospheric electrons are accelerated by a parallel electric field of an auroral potential structure and are streaming upward to the high latitude magnetosphere.

Original language	English
Article number	e2020GL090522
Journal	Geophysical Research Letters
Volume	48
Issue number	5
DOIs	https://doi.org/10.1029/2020GL090522
Publication status	Published - 2021 Mar 16

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Kazama, Y., Kojima, H., Miyoshi, Y., Kasahara, Y., Kasahara, S., Usui, H., Wang, B. J., Wang, S. Y., Tam, S. W. Y., Chang, T. F., Asamura, K., Kasaba, Y., Matsuda, S., Shoji, M., Matsuoka, A., Teramoto, M., Takashima, T., & Shinohara, I. (2021). Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase. Geophysical Research Letters, 48(5), Article e2020GL090522. https://doi.org/10.1029/2020GL090522

@article{22cbc9bdd4094a87976b7cdfb308e890,

title = "Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase",

abstract = "This report describes electron beams observed at high latitudes in the magnetosphere by the Arase satellite. According to fine angular channel measurements, beam electrons are mainly flowing away from the Earth, and are well collimated to within a few degrees. A statistical study indicates that the beams are seen when Arase is located at Lm > ∼5, and more frequently as the magnetosphere becomes active. The field lines of the beam events are traced back to the typical auroral ovals. The statistical properties of the beams are consistent with the interpretation that ionospheric electrons are accelerated by a parallel electric field of an auroral potential structure and are streaming upward to the high latitude magnetosphere.",

author = "Y. Kazama and H. Kojima and Y. Miyoshi and Y. Kasahara and S. Kasahara and H. Usui and Wang, {B. J.} and Wang, {S. Y.} and Tam, {S. W.Y.} and Chang, {T. F.} and K. Asamura and Y. Kasaba and S. Matsuda and M. Shoji and A. Matsuoka and M. Teramoto and T. Takashima and I. Shinohara",

note = "Funding Information: This work was supported by Ministry of Science and Technology of Taiwan under Contract No. MOST 106‐2111‐001‐011, and by Japan Society for the Promotion of Science, KAKENHI Grant Numbers 15H05815, 15H05747, 16H06286, 17H00728, and 20H01959. Publisher Copyright: {\textcopyright} 2021. American Geophysical Union. All Rights Reserved.",

year = "2021",

month = mar,

day = "16",

doi = "10.1029/2020GL090522",

language = "English",

volume = "48",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "Wiley-Blackwell",

number = "5",

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Kazama, Y, Kojima, H, Miyoshi, Y, Kasahara, Y, Kasahara, S, Usui, H, Wang, BJ, Wang, SY, Tam, SWY, Chang, TF, Asamura, K, Kasaba, Y, Matsuda, S, Shoji, M, Matsuoka, A, Teramoto, M, Takashima, T & Shinohara, I 2021, 'Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase', Geophysical Research Letters, vol. 48, no. 5, e2020GL090522. https://doi.org/10.1029/2020GL090522

TY - JOUR

T1 - Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase

AU - Kazama, Y.

AU - Kojima, H.

AU - Miyoshi, Y.

AU - Kasahara, Y.

AU - Kasahara, S.

AU - Usui, H.

AU - Wang, B. J.

AU - Wang, S. Y.

AU - Tam, S. W.Y.

AU - Chang, T. F.

AU - Asamura, K.

AU - Kasaba, Y.

AU - Matsuda, S.

AU - Shoji, M.

AU - Matsuoka, A.

AU - Teramoto, M.

AU - Takashima, T.

AU - Shinohara, I.

N1 - Funding Information: This work was supported by Ministry of Science and Technology of Taiwan under Contract No. MOST 106‐2111‐001‐011, and by Japan Society for the Promotion of Science, KAKENHI Grant Numbers 15H05815, 15H05747, 16H06286, 17H00728, and 20H01959. Publisher Copyright: © 2021. American Geophysical Union. All Rights Reserved.

PY - 2021/3/16

Y1 - 2021/3/16

N2 - This report describes electron beams observed at high latitudes in the magnetosphere by the Arase satellite. According to fine angular channel measurements, beam electrons are mainly flowing away from the Earth, and are well collimated to within a few degrees. A statistical study indicates that the beams are seen when Arase is located at Lm > ∼5, and more frequently as the magnetosphere becomes active. The field lines of the beam events are traced back to the typical auroral ovals. The statistical properties of the beams are consistent with the interpretation that ionospheric electrons are accelerated by a parallel electric field of an auroral potential structure and are streaming upward to the high latitude magnetosphere.

AB - This report describes electron beams observed at high latitudes in the magnetosphere by the Arase satellite. According to fine angular channel measurements, beam electrons are mainly flowing away from the Earth, and are well collimated to within a few degrees. A statistical study indicates that the beams are seen when Arase is located at Lm > ∼5, and more frequently as the magnetosphere becomes active. The field lines of the beam events are traced back to the typical auroral ovals. The statistical properties of the beams are consistent with the interpretation that ionospheric electrons are accelerated by a parallel electric field of an auroral potential structure and are streaming upward to the high latitude magnetosphere.

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DO - 10.1029/2020GL090522

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VL - 48

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 5

M1 - e2020GL090522

ER -

Extremely Collimated Electron Beams in the High Latitude Magnetosphere Observed by Arase

Abstract

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