| DOI: | 10.1002/grl.50368
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| 论文题名: | Interstellar He+ ring-beam distributions: Observations and implications |
| 作者: | Drews C.; Berger L.; Wimmer-Schweingruber R.F.; Galvin A.B.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9142
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| EISSN: | 1944-8873
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| 出版年: | 2013
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| 卷: | 40, 期:8 | | 起始页码: | 1468
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| 结束页码: | 1473
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| 语种: | 英语
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| 英文关键词: | He + Pitch Angle
; Injection of Pickup Ion
; Interstellar Helium
; Pickup He+
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| Scopus关键词: | In-situ observations
; Incident angles
; Interplanetary magnetic fields
; Measurements of
; Pitch angle
; Pitch angle distribution
; Solar wind velocity
; Spectral shapes
; Magnetosphere
; Pickups
; Solar wind
; Ions
; helium
; light scattering
; magnetic field
; planetary surface
; plasma
; solar wind
; wind velocity
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| 英文摘要: | We report systematic measurements of the distribution of the incident angle of interstellar pickup He+ ions as observed by STEREO/Plasma and Supra-Thermal Ion Composition (PLASTIC). We have organized these observations according to the angle spanned by the Interplanetary Magnetic Field (IMF), B→, and the bulk solar wind velocity, vsw→. Our measurements show clear evidence of a relatively local injection of He+ pickup ions into the solar wind, which are then seen as a ring distribution perpendicular to B→. Changes of the spectral shape and a reduced flux of interstellar He+ during radial IMF configuration, as observed by, e.g., Ulysses/Solar Wind Ion Composition Spectrometer (SWICS), SOHO/Charge Time-Of-Flight (CTOF), Active Magnetospheric Particle Tracer Explorers/SUprathermaL Energy Ionic Charge Analyzer (SULEICA), have generally been attributed to inefficient scattering across 90° pitch-angle. Our observations of the pitch-angle distribution of interstellar He+ suggest that these changes are instead a result of locally injected pickup ions that escape detection for IMF configuration in which the Solar Wind Sector of PLASTIC, as well as SWICS, CTOF, and SULEICA, are not sensitive to the measurement of the locally injected pickup ion ring. Key Points Observation of the initial ring beam distribution of interstellar He+ Pitch-angle distribution of interstellar He+ In-situ observations of the pickup ion injection process. ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877962637&doi=10.1002%2fgrl.50368&partnerID=40&md5=0c3011e2b63caca537835ee5362291a1
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6406
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Institute for Experimental and Applied Physics, Christian-Albrechts-University Kiel, Kiel, Germany
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| Recommended Citation: | |
Drews C.,Berger L.,Wimmer-Schweingruber R.F.,et al. Interstellar He+ ring-beam distributions: Observations and implications[J]. Geophysical Research Letters,2013-01-01,40(8).
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