Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae

Abstract Pulsating aurorae (PsA) are caused by the intermittent precipitations of magnetospheric electrons (energies of a few keV to a few tens of keV) through wave-particle interactions, thereby depositing most of their energy at altitudes ~ 100 km. However, the maximum energy of precipitated elect...

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Autores principales:	Y. Miyoshi, K. Hosokawa, S. Kurita, S.-I. Oyama, Y. Ogawa, S. Saito, I. Shinohara, A. Kero, E. Turunen, P. T. Verronen, S. Kasahara, S. Yokota, T. Mitani, T. Takashima, N. Higashio, Y. Kasahara, S. Matsuda, F. Tsuchiya, A. Kumamoto, A. Matsuoka, T. Hori, K. Keika, M. Shoji, M. Teramoto, S. Imajo, C. Jun, S. Nakamura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/909b20563ea64a88863b05f22a43f019
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spelling	oai:doaj.org-article:909b20563ea64a88863b05f22a43f0192021-12-02T15:33:13ZPenetration of MeV electrons into the mesosphere accompanying pulsating aurorae10.1038/s41598-021-92611-32045-2322https://doaj.org/article/909b20563ea64a88863b05f22a43f0192021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92611-3https://doaj.org/toc/2045-2322Abstract Pulsating aurorae (PsA) are caused by the intermittent precipitations of magnetospheric electrons (energies of a few keV to a few tens of keV) through wave-particle interactions, thereby depositing most of their energy at altitudes ~ 100 km. However, the maximum energy of precipitated electrons and its impacts on the atmosphere are unknown. Herein, we report unique observations by the European Incoherent Scatter (EISCAT) radar showing electron precipitations ranging from a few hundred keV to a few MeV during a PsA associated with a weak geomagnetic storm. Simultaneously, the Arase spacecraft has observed intense whistler-mode chorus waves at the conjugate location along magnetic field lines. A computer simulation based on the EISCAT observations shows immediate catalytic ozone depletion at the mesospheric altitudes. Since PsA occurs frequently, often in daily basis, and extends its impact over large MLT areas, we anticipate that the PsA possesses a significant forcing to the mesospheric ozone chemistry in high latitudes through high energy electron precipitations. Therefore, the generation of PsA results in the depletion of mesospheric ozone through high-energy electron precipitations caused by whistler-mode chorus waves, which are similar to the well-known effect due to solar energetic protons triggered by solar flares.Y. MiyoshiK. HosokawaS. KuritaS.-I. OyamaY. OgawaS. SaitoI. ShinoharaA. KeroE. TurunenP. T. VerronenS. KasaharaS. YokotaT. MitaniT. TakashimaN. HigashioY. KasaharaS. MatsudaF. TsuchiyaA. KumamotoA. MatsuokaT. HoriK. KeikaM. ShojiM. TeramotoS. ImajoC. JunS. NakamuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Y. Miyoshi K. Hosokawa S. Kurita S.-I. Oyama Y. Ogawa S. Saito I. Shinohara A. Kero E. Turunen P. T. Verronen S. Kasahara S. Yokota T. Mitani T. Takashima N. Higashio Y. Kasahara S. Matsuda F. Tsuchiya A. Kumamoto A. Matsuoka T. Hori K. Keika M. Shoji M. Teramoto S. Imajo C. Jun S. Nakamura Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae
description	Abstract Pulsating aurorae (PsA) are caused by the intermittent precipitations of magnetospheric electrons (energies of a few keV to a few tens of keV) through wave-particle interactions, thereby depositing most of their energy at altitudes ~ 100 km. However, the maximum energy of precipitated electrons and its impacts on the atmosphere are unknown. Herein, we report unique observations by the European Incoherent Scatter (EISCAT) radar showing electron precipitations ranging from a few hundred keV to a few MeV during a PsA associated with a weak geomagnetic storm. Simultaneously, the Arase spacecraft has observed intense whistler-mode chorus waves at the conjugate location along magnetic field lines. A computer simulation based on the EISCAT observations shows immediate catalytic ozone depletion at the mesospheric altitudes. Since PsA occurs frequently, often in daily basis, and extends its impact over large MLT areas, we anticipate that the PsA possesses a significant forcing to the mesospheric ozone chemistry in high latitudes through high energy electron precipitations. Therefore, the generation of PsA results in the depletion of mesospheric ozone through high-energy electron precipitations caused by whistler-mode chorus waves, which are similar to the well-known effect due to solar energetic protons triggered by solar flares.
format	article
author	Y. Miyoshi K. Hosokawa S. Kurita S.-I. Oyama Y. Ogawa S. Saito I. Shinohara A. Kero E. Turunen P. T. Verronen S. Kasahara S. Yokota T. Mitani T. Takashima N. Higashio Y. Kasahara S. Matsuda F. Tsuchiya A. Kumamoto A. Matsuoka T. Hori K. Keika M. Shoji M. Teramoto S. Imajo C. Jun S. Nakamura
author_facet	Y. Miyoshi K. Hosokawa S. Kurita S.-I. Oyama Y. Ogawa S. Saito I. Shinohara A. Kero E. Turunen P. T. Verronen S. Kasahara S. Yokota T. Mitani T. Takashima N. Higashio Y. Kasahara S. Matsuda F. Tsuchiya A. Kumamoto A. Matsuoka T. Hori K. Keika M. Shoji M. Teramoto S. Imajo C. Jun S. Nakamura
author_sort	Y. Miyoshi
title	Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae
title_short	Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae
title_full	Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae
title_fullStr	Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae
title_full_unstemmed	Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae
title_sort	penetration of mev electrons into the mesosphere accompanying pulsating aurorae
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/909b20563ea64a88863b05f22a43f019
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Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae

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