Observations of He I 584 A nighttime radiation - Evidence for an interstellar source of neutral helium
Observations of He I 584 A nighttime radiation - Evidence for an interstellar source of neutral helium
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He I 584 A 夜间辐射的观测——中性氦星际源的证据
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
Shailendra Kumar
中科院分区：
文献类型：
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作者：
F. Paresce;S. Bowyer;Shailendra Kumar
He I 584 A辐射在夜空中的强度和空间变化是由从印度Thumba发射的探空火箭在264公里的高度测量的。通量的强度随着视角的变化而变化，从最高的16 ± 5瑞利到最低的小于1瑞利。所获得的数据以全天图的形式呈现。由于观测到的峰值通量水平比地冠共振散射的预期值大约大两个数量级，我们将我们的结果与两个中性氦行星际源的预期结果进行了比较：当地星际介质渗透到太阳附近和太阳风α粒子的尘埃去电离。尘埃去离子模型的预测，使用目前接受的输入参数似乎是不一致的意见。星际氦源与模型的不确定性范围内的数据是兼容的。
The intensity and spatial variations of the He I 584 A radiation in the night sky were measured to an altitude of 264 km from a sounding rocket launched from Thumba, India. The flux varied in intensity with look angle from a high of 16 plus or minus 5 rayleighs to a low of less than 1 rayleigh. The data obtained are presented in the form of an all-sky map. Since the peak flux levels observed are approximately two orders of magnitude larger than that expected from geocoronal resonant scattering, we have compared our results with those expected from two interplanetary sources of neutral helium: the penetration of the local interstellar medium into the solar neighborhood and the dust deionization of solar-wind alpha particles. The dust deionization-model predictions using currently accepted input parameters appear to be inconsistent with the observations. The interstellar helium source is compatible with the data to within the uncertainties of the models.