The ion composition in solar energetic particle events observed in 1993-1995

Nobuyuki Hasebe; Tadayoshi Doke; Takayoshi Hayashi; Jun Kikuchii; Masanori Kobayashi; Hidekazu Shirai; Naohiro Takenaka; Takeshi Takashima; Brend Wilken; Quigan Zong

doi:10.1143/JPSJ.70.3167

The ion composition in solar energetic particle events observed in 1993-1995

Nobuyuki Hasebe^*, Tadayoshi Doke, Takayoshi Hayashi, Jun Kikuchii, Masanori Kobayashi, Hidekazu Shirai, Naohiro Takenaka, Takeshi Takashima, Brend Wilken, Quigan Zong

^*この研究の対応する著者

研究成果: Article › 査読

抄録

Five large events of solar energetic particles (SEP) during three years from 1993 to 1995 have been observed by high energy particle (HEP) instruments onboard GEOTAIL spacecraft. The composition of energetic ions, their energy spectra and time profiles of ion intensity were measured for the SEP events. Three SEP events observed on Feb. 15, 1993, Mar. 4, 1993 and Oct. 20, 1994, are enriched in Fe ions (> 10 MeV/n). The enhancement of Fe ions was observed at the onset time of SEP events (Mar. 4, 1993 and Oct. 20, 1994). The onset of the SEP events seems to have a feature with "impulsive" and "gradual" characteristics. This indicates a mixture of different seed populations and acceleration processes operating in these events.

本文言語	English
ページ（範囲）	3167-3173
ページ数	7
ジャーナル	Journal of the Physical Society of Japan
巻	70
号	10
DOI	https://doi.org/10.1143/JPSJ.70.3167
出版ステータス	Published - 2001 10月

ASJC Scopus subject areas

物理学および天文学（全般）

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10.1143/JPSJ.70.3167

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title = "The ion composition in solar energetic particle events observed in 1993-1995",

abstract = "Five large events of solar energetic particles (SEP) during three years from 1993 to 1995 have been observed by high energy particle (HEP) instruments onboard GEOTAIL spacecraft. The composition of energetic ions, their energy spectra and time profiles of ion intensity were measured for the SEP events. Three SEP events observed on Feb. 15, 1993, Mar. 4, 1993 and Oct. 20, 1994, are enriched in Fe ions (> 10 MeV/n). The enhancement of Fe ions was observed at the onset time of SEP events (Mar. 4, 1993 and Oct. 20, 1994). The onset of the SEP events seems to have a feature with {"}impulsive{"} and {"}gradual{"} characteristics. This indicates a mixture of different seed populations and acceleration processes operating in these events.",

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author = "Nobuyuki Hasebe and Tadayoshi Doke and Takayoshi Hayashi and Jun Kikuchii and Masanori Kobayashi and Hidekazu Shirai and Naohiro Takenaka and Takeshi Takashima and Brend Wilken and Quigan Zong",

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AU - Hasebe, Nobuyuki

AU - Doke, Tadayoshi

AU - Hayashi, Takayoshi

AU - Kikuchii, Jun

AU - Kobayashi, Masanori

AU - Shirai, Hidekazu

AU - Takenaka, Naohiro

AU - Takashima, Takeshi

AU - Wilken, Brend

AU - Zong, Quigan

PY - 2001/10

Y1 - 2001/10

N2 - Five large events of solar energetic particles (SEP) during three years from 1993 to 1995 have been observed by high energy particle (HEP) instruments onboard GEOTAIL spacecraft. The composition of energetic ions, their energy spectra and time profiles of ion intensity were measured for the SEP events. Three SEP events observed on Feb. 15, 1993, Mar. 4, 1993 and Oct. 20, 1994, are enriched in Fe ions (> 10 MeV/n). The enhancement of Fe ions was observed at the onset time of SEP events (Mar. 4, 1993 and Oct. 20, 1994). The onset of the SEP events seems to have a feature with "impulsive" and "gradual" characteristics. This indicates a mixture of different seed populations and acceleration processes operating in these events.

AB - Five large events of solar energetic particles (SEP) during three years from 1993 to 1995 have been observed by high energy particle (HEP) instruments onboard GEOTAIL spacecraft. The composition of energetic ions, their energy spectra and time profiles of ion intensity were measured for the SEP events. Three SEP events observed on Feb. 15, 1993, Mar. 4, 1993 and Oct. 20, 1994, are enriched in Fe ions (> 10 MeV/n). The enhancement of Fe ions was observed at the onset time of SEP events (Mar. 4, 1993 and Oct. 20, 1994). The onset of the SEP events seems to have a feature with "impulsive" and "gradual" characteristics. This indicates a mixture of different seed populations and acceleration processes operating in these events.

KW - CME

KW - Solar composition

KW - Solar energetic particle

KW - Solar flare

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The ion composition in solar energetic particle events observed in 1993-1995

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