Time and altitude dependence of 55-Mev trapped protons, August 1961 to June 1964
Time and altitude dependence of 55-Mev trapped protons, August 1961 to June 1964
复制标题
DOI：
10.1029/jz070i023p05807
复制
发表时间：
1965-12
影响因子：
--
通讯作者：
R. Filz;E. Holeman
中科院分区：
文献类型：
--
作者：
R. Filz;E. Holeman
本文报道了1961年8月至1964年6月在南大西洋一个小区域内，由可回收定向的空军卫星上的核乳胶探测到的55兆电子伏全向俘获质子的测量结果，测量高度为221至736公里。在1961年8月至1962年6月期间，数据最好地拟合了通量与高度的关系曲线J = 4.99 × 10−11 H4.792质子/m2秒Mev，并且与这些高度上的大气密度变化非常一致。H是南大西洋上空的高度，以公里为单位，时间是在轨道上的总时间。没有观察到由于大气密度变化而预期的通量随时间持续缓慢增加的现象。在1962年7月9日海星号的高空核爆炸后，观测到通量的突然增加，这被解释为与赤道L = 1.4时内区质子的非绝热重新分布一致，俯仰角变化约为3.5°。质子通量衰减的基础上预期的大气电离损失，只有在2年的时间。在275、350、440和500 km的高度上，符合衰变的俘获质子平均大气密度值分别为3×107、7×106、2×106和1×106原子电子/cm 3。
Measurements of 55-Mev omnidirectional trapped protons detected in a small region of the South Atlantic by nuclear emulsions flown on recoverable oriented Air Force satellites are reported for the period August 1961 to June 1964 between altitudes of 221 and 736 km. During the period August 1961 to June 1962, the data best fit a flux versus altitude curve J = 4.99 × 10−11 H4.792 protons/m2 sec Mev and is in good agreement with the variation of atmospheric density at these altitudes. H is the altitude over the South Atlantic measured in kilometers, and the time is the total time in orbit. No consistent slow increase of flux with time was observed as would be expected as the result of changes in atmospheric density. A sudden increase in flux was observed after the July 9, 1962, high-altitude nuclear explosion Starfish, which is explained as consistent with a nonadiabatic redistribution of inner-zone protons with an approximate 3.5° pitch angle change for L = 1.4 at the equator. The proton flux decays as expected on the basis of atmospheric ionization losses only, over a 2-year period. The values of the trapped proton average atmospheric density that fit the decay are 3×107, 7×106, 2×106, and 1×106 atomic electrons per cm3 for altitudes of 275, 350, 440, and 500 km.