Interstellar He+ ring‐beam distributions: Observations and implications

Interstellar He+ ring‐beam distributions: Observations and implications
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星际氦环束分布:观测结果和影响

DOI:
10.1002/grl.50368
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发表时间:
2013
影响因子:
5.2
通讯作者:
Galvin
Galvin
中科院分区:
地球科学1区
文献类型:
--
作者:
Berger;Wimmer-Schweingruber;R. F.;;Galvin

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我们报告了通过STEREO/Plasma和超热离子成分(PLASTIC)观察到的星际拾取He+离子入射角分布的系统测量。我们根据行星际磁场(IMF)和太阳风速度的角度来组织这些观测。我们的测量结果显示了He+拾取离子相对局部注入太阳风的明确证据,然后将其视为垂直于的环形分布。在径向IMF配置期间星际He+的光谱形状和减少的通量的变化,例如,太阳风/太阳风离子成分谱仪(SWICS)、SOHO/电荷飞行时间(CTOF)、主动磁层粒子示踪探测器/太阳热能离子电荷分析仪(SULEICA),通常归因于90°俯仰角上的低效散射。我们对星际He+的俯仰角分布的观察表明,这些变化是由于局部注入的拾取离子逃脱了IMF配置的检测,其中PLASTIC的太阳风扇区以及SWICS,CTOF和SULEICA对局部注入拾取离子环的测量不敏感。
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), , and the bulk solar wind velocity, . 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 . 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.
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