The first observation of sulfur in anomalous cosmic rays by the Geotail and the wind spacecrafts

T. Takashima*, T. Doke, T. Hayashi, J. Kikuchi, M. Kobayashi, H. Shirai, N. Takehana, M. Ehara, Y. Yamada, S. Yanagita, Nobuyuki Hasebe, T. Kashiwagi, C. Kato, K. Munakata, T. Kohno, K. Kondoh, H. Murakami, A. Nakamoto, T. Yanagimachi, D. V. ReamesT. T. Von Rosenvinge

*この研究の対応する著者

研究成果: Article査読

8 被引用数 (Scopus)

抄録

The Geotail high-energy particle instruments have observed cosmic-ray particles in the energy range from 3 MeV n-1 to 150 MeV n-1 at 1 AU during the period 1992 September-1995 August. A remarkable enhancement of anomalous cosmic-ray (ACR) N, O, Ne, and C is observed during the period. A measurable enhancement of the sulfur flux below about 20 MeV n-1 was observed. This is the first evidence showing the existence of sulfur in the anomalous component. The flux increase of anomalous sulfur, with a first ionization potential (FIP) of 10.4 eV, is smaller than that of ACR carbon with an FIP of 11.3 eV and much smaller than those of high-FIP elements, which suggests that the fractions of neutral carbon and sulfur atoms are significantly low in the very local interstellar medium.

本文言語English
ジャーナルAstrophysical Journal
477
2 PART II
出版ステータスPublished - 1997
外部発表はい

ASJC Scopus subject areas

  • 宇宙惑星科学

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