低地球轨道中捕获的反常宇宙射线的LET能谱。

LET spectra of trapped anomalous cosmic rays in low-Earth orbit.

作者信息

Tylka A J, Boberg P R, Adams J H

机构信息

E.O. Hulbert Center for Space Research, Naval Research Laboratory, Washington, DC 20375-5352, USA.

出版信息

Adv Space Res. 1996;17(2):47-51. doi: 10.1016/0273-1177(95)00511-c.

DOI:10.1016/0273-1177(95)00511-c

PMID:11540370

Abstract

Observations aboard Cosmos satellites discovered trapped anomalous cosmic rays (ACRs), tracked the variation in their intensity in 1986-1988, and measured their fluence, spectrum, and composition at solar minimum in the previous solar cycle. The MAST instrument aboard the SAMPEX satellite has observed trapped anomalous cosmic rays in the present solar cycle, confirmed the general features of the Cosmos data, and provided the first detailed observations of trapped ACRs. In this paper we apply theoretical modeling of trapped ACRs, which is shown to provide a reasonably good description of both the Cosmos and SAMPEX data, to calculate the integral linear-energy-transfer (LET) spectra due to trapped ACRs in typical low-Earth orbits. We compare these calculations with the LET spectra produced by galactic cosmic rays (GCRs) and non-trapped ACRs in order to assess the relative radiation hazard posed by trapped ACRs.

摘要

搭载“宇宙”系列卫星进行的观测发现了捕获的反常宇宙射线（ACR），追踪了其在1986 - 1988年强度的变化，并在前一个太阳活动周期太阳活动极小期测量了它们的注量、能谱和成分。搭载在“太阳风粒子探测器”（SAMPEX）卫星上的“磁层亚暴与热层相互作用”（MAST）仪器在当前太阳活动周期观测到了捕获的反常宇宙射线，证实了“宇宙”系列卫星数据的总体特征，并提供了对捕获的ACR的首次详细观测。在本文中，我们应用捕获ACR的理论模型（该模型被证明能对“宇宙”系列卫星和SAMPEX卫星的数据给出合理的良好描述）来计算典型低地球轨道中捕获的ACR产生的积分线能量转移（LET）能谱。我们将这些计算结果与银河宇宙射线（GCR）和未捕获的ACR产生的LET能谱进行比较，以评估捕获的ACR造成的相对辐射危害。