Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves

Abstract A study using Arase data gives the first observational evidence that the frequency drift of electromagnetic ion cyclotron (EMIC) waves is caused by cyclotron trapping. EMIC emissions play an important role in planetary magnetospheres, causing scattering loss of radiation belt relativistic e...

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Autores principales:	Masafumi Shoji, Yoshizumi Miyoshi, Lynn M. Kistler, Kazushi Asamura, Ayako Matsuoka, Yasumasa Kasaba, Shoya Matsuda, Yoshiya Kasahara, Iku Shinohara
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/4988820b423a4069977dd1d61f426116
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spelling	oai:doaj.org-article:4988820b423a4069977dd1d61f4261162021-12-02T16:31:46ZDiscovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves10.1038/s41598-021-92541-02045-2322https://doaj.org/article/4988820b423a4069977dd1d61f4261162021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92541-0https://doaj.org/toc/2045-2322Abstract A study using Arase data gives the first observational evidence that the frequency drift of electromagnetic ion cyclotron (EMIC) waves is caused by cyclotron trapping. EMIC emissions play an important role in planetary magnetospheres, causing scattering loss of radiation belt relativistic electrons and energetic protons. EMIC waves frequently show nonlinear signatures that include frequency drift and amplitude enhancements. While nonlinear growth theory has suggested that the frequency change is caused by nonlinear resonant currents owing to cyclotron trapping of the particles, observational evidence for this has been elusive. We survey the wave data observed by Arase from March, 2017 to September 2019, and find the best falling tone emission event, one detected on 11th November, 2017, for the wave particle interaction analysis. Here, we show for the first time direct evidence of the formation of a proton hill in phase space indicating cyclotron trapping. The associated resonance currents and the wave growth of a falling tone EMIC wave are observed coincident with the hill, as theoretically predicted.Masafumi ShojiYoshizumi MiyoshiLynn M. KistlerKazushi AsamuraAyako MatsuokaYasumasa KasabaShoya MatsudaYoshiya KasaharaIku ShinoharaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Masafumi Shoji Yoshizumi Miyoshi Lynn M. Kistler Kazushi Asamura Ayako Matsuoka Yasumasa Kasaba Shoya Matsuda Yoshiya Kasahara Iku Shinohara Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves
description	Abstract A study using Arase data gives the first observational evidence that the frequency drift of electromagnetic ion cyclotron (EMIC) waves is caused by cyclotron trapping. EMIC emissions play an important role in planetary magnetospheres, causing scattering loss of radiation belt relativistic electrons and energetic protons. EMIC waves frequently show nonlinear signatures that include frequency drift and amplitude enhancements. While nonlinear growth theory has suggested that the frequency change is caused by nonlinear resonant currents owing to cyclotron trapping of the particles, observational evidence for this has been elusive. We survey the wave data observed by Arase from March, 2017 to September 2019, and find the best falling tone emission event, one detected on 11th November, 2017, for the wave particle interaction analysis. Here, we show for the first time direct evidence of the formation of a proton hill in phase space indicating cyclotron trapping. The associated resonance currents and the wave growth of a falling tone EMIC wave are observed coincident with the hill, as theoretically predicted.
format	article
author	Masafumi Shoji Yoshizumi Miyoshi Lynn M. Kistler Kazushi Asamura Ayako Matsuoka Yasumasa Kasaba Shoya Matsuda Yoshiya Kasahara Iku Shinohara
author_facet	Masafumi Shoji Yoshizumi Miyoshi Lynn M. Kistler Kazushi Asamura Ayako Matsuoka Yasumasa Kasaba Shoya Matsuda Yoshiya Kasahara Iku Shinohara
author_sort	Masafumi Shoji
title	Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves
title_short	Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves
title_full	Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves
title_fullStr	Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves
title_full_unstemmed	Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves
title_sort	discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/4988820b423a4069977dd1d61f426116
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Discovery of proton hill in the phase space during interactions between ions and electromagnetic ion cyclotron waves

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