HE-2+ IN FIELD-ALIGNED BEAMS - ISEE RESULTS

被引：22

作者：

FUSELIER, SA ^{[1
]}

THOMSEN, MF ^{[1
]}

机构：

[1] UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545

来源：

GEOPHYSICAL RESEARCH LETTERS | 1992年 / 19卷 / 05期

关键词：

D O I：

10.1029/92GL00375

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

He2+ concentrations are determined for 14 field-aligned proton beam events observed in the ion foreshock region upstream from the Earth's bow shock by the ISEE spacecraft. For all 14 events, most under normal solar wind conditions, the He2+ concentrations were a factor of 10 or more below the H+ concentrations in the field-aligned beams when normalized by the solar wind He2+ to H+ density ratio. These results indicate that field-aligned beams do not provide the principal He2+ seed population for ion acceleration in the ion foreshock region.

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页码：437 / 440

页数：4

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