Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite

M. Fukizawa; T. Sakanoi; Y. Miyoshi; Y. Kazama; Y. Katoh; Y. Kasahara; S. Matsuda; A. Matsuoka; S. Kurita; M. Shoji; M. Teramoto; S. Imajo; I. Sinohara; S. Y. Wang; S. W.Y. Tam; T. F. Chang; B. J. Wang; C. W. Jun

doi:10.1029/2020GL089926

Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite

M. Fukizawa, T. Sakanoi, Y. Miyoshi, Y. Kazama, Y. Katoh, Y. Kasahara, S. Matsuda, A. Matsuoka, S. Kurita, M. Shoji, M. Teramoto, S. Imajo, I. Sinohara, S. Y. Wang, S. W.Y. Tam, T. F. Chang, B. J. Wang, C. W. Jun

Institute of Space and Plasma Sciences

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

10 Citations (Scopus)

Abstract

Electrostatic electron cyclotron harmonic (ECH) waves are generally excited in the magnetic equator region, in the sector from nightside to dayside during geomagnetically active conditions, and cause the pitch angle scattering by cyclotron resonance. The scattered electrons precipitate into the Earth's atmosphere and cause auroral emission. However, there is no observational evidence that ECH waves actually scatter electrons into the loss cone in the magnetosphere. In this study, from simultaneous wave and particle observation data obtained by the Arase satellite equipped with a high-pitch angular resolution electron analyzer, we present evidence that the ECH wave intensity near the magnetic equator is correlated with an electron flux inside the loss cone with an energy of about 5 keV. The simulation suggests that this electron flux contributes to the auroral emission at 557.7 nm with an intensity of about 200 R.

Original language	English
Article number	e2020GL089926
Journal	Geophysical Research Letters
Volume	47
Issue number	23
DOIs	https://doi.org/10.1029/2020GL089926
Publication status	Published - 2020 Dec 16

All Science Journal Classification (ASJC) codes

Geophysics
General Earth and Planetary Sciences

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10.1029/2020GL089926

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Fukizawa, M., Sakanoi, T., Miyoshi, Y., Kazama, Y., Katoh, Y., Kasahara, Y., Matsuda, S., Matsuoka, A., Kurita, S., Shoji, M., Teramoto, M., Imajo, S., Sinohara, I., Wang, S. Y., Tam, S. W. Y., Chang, T. F., Wang, B. J., & Jun, C. W. (2020). Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite. Geophysical Research Letters, 47(23), Article e2020GL089926. https://doi.org/10.1029/2020GL089926

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title = "Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite",

abstract = "Electrostatic electron cyclotron harmonic (ECH) waves are generally excited in the magnetic equator region, in the sector from nightside to dayside during geomagnetically active conditions, and cause the pitch angle scattering by cyclotron resonance. The scattered electrons precipitate into the Earth's atmosphere and cause auroral emission. However, there is no observational evidence that ECH waves actually scatter electrons into the loss cone in the magnetosphere. In this study, from simultaneous wave and particle observation data obtained by the Arase satellite equipped with a high-pitch angular resolution electron analyzer, we present evidence that the ECH wave intensity near the magnetic equator is correlated with an electron flux inside the loss cone with an energy of about 5 keV. The simulation suggests that this electron flux contributes to the auroral emission at 557.7 nm with an intensity of about 200 R.",

author = "M. Fukizawa and T. Sakanoi and Y. Miyoshi and Y. Kazama and Y. Katoh and Y. Kasahara and S. Matsuda and A. Matsuoka and S. Kurita and M. Shoji and M. Teramoto and S. Imajo and I. Sinohara and Wang, {S. Y.} and Tam, {S. W.Y.} and Chang, {T. F.} and Wang, {B. J.} and Jun, {C. W.}",

year = "2020",

month = dec,

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doi = "10.1029/2020GL089926",

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journal = "Geophysical Research Letters",

issn = "0094-8276",

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Fukizawa, M, Sakanoi, T, Miyoshi, Y, Kazama, Y, Katoh, Y, Kasahara, Y, Matsuda, S, Matsuoka, A, Kurita, S, Shoji, M, Teramoto, M, Imajo, S, Sinohara, I, Wang, SY, Tam, SWY , Chang, TF, Wang, BJ & Jun, CW 2020, 'Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite', Geophysical Research Letters, vol. 47, no. 23, e2020GL089926. https://doi.org/10.1029/2020GL089926

TY - JOUR

T1 - Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite

AU - Fukizawa, M.

AU - Sakanoi, T.

AU - Miyoshi, Y.

AU - Kazama, Y.

AU - Katoh, Y.

AU - Kasahara, Y.

AU - Matsuda, S.

AU - Matsuoka, A.

AU - Kurita, S.

AU - Shoji, M.

AU - Teramoto, M.

AU - Imajo, S.

AU - Sinohara, I.

AU - Wang, S. Y.

AU - Tam, S. W.Y.

AU - Chang, T. F.

AU - Wang, B. J.

AU - Jun, C. W.

PY - 2020/12/16

Y1 - 2020/12/16

N2 - Electrostatic electron cyclotron harmonic (ECH) waves are generally excited in the magnetic equator region, in the sector from nightside to dayside during geomagnetically active conditions, and cause the pitch angle scattering by cyclotron resonance. The scattered electrons precipitate into the Earth's atmosphere and cause auroral emission. However, there is no observational evidence that ECH waves actually scatter electrons into the loss cone in the magnetosphere. In this study, from simultaneous wave and particle observation data obtained by the Arase satellite equipped with a high-pitch angular resolution electron analyzer, we present evidence that the ECH wave intensity near the magnetic equator is correlated with an electron flux inside the loss cone with an energy of about 5 keV. The simulation suggests that this electron flux contributes to the auroral emission at 557.7 nm with an intensity of about 200 R.

AB - Electrostatic electron cyclotron harmonic (ECH) waves are generally excited in the magnetic equator region, in the sector from nightside to dayside during geomagnetically active conditions, and cause the pitch angle scattering by cyclotron resonance. The scattered electrons precipitate into the Earth's atmosphere and cause auroral emission. However, there is no observational evidence that ECH waves actually scatter electrons into the loss cone in the magnetosphere. In this study, from simultaneous wave and particle observation data obtained by the Arase satellite equipped with a high-pitch angular resolution electron analyzer, we present evidence that the ECH wave intensity near the magnetic equator is correlated with an electron flux inside the loss cone with an energy of about 5 keV. The simulation suggests that this electron flux contributes to the auroral emission at 557.7 nm with an intensity of about 200 R.

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VL - 47

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 23

M1 - e2020GL089926

ER -

Pitch-Angle Scattering of Inner Magnetospheric Electrons Caused by ECH Waves Obtained With the Arase Satellite

Abstract

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