Solar Proton Monitoring Experiment

The solar proton monitoring experiment utilized four separate detectors, each of which used one or more solid-state sensors. Three detectors measured the omnidirectional fluxes of protons and alpha particles with energy per nucleon values above 10, 30, and 60 MeV. Alpha particle contributions to the total count rates were generally less than 10%. These detectors were also sensitive to electrons above approximately 0.7, 2.0, and 8.0 MeV, respectively. The 10-MeV channel was sampled for two 19.2-s intervals every 163.8 s and the 30- and 60-MeV channels for one 19.2-s interval every 163.8 s. Resultant hourly averaged fluxes have been published in Solar-Geophysical Data (NOAA, Boulder) on a rapid basis. The fourth detector had a 60-deg full look angle normal to the spacecraft spin axis. Each of two discrimination levels was sampled for two 19.2-s intervals every 163.8 s. Fluxes of 1- to 10-MeV/nucleon protons and alpha particles were measured in the lower and upper discrimination states, respectively. All detectors functioned normally from launch until the spacecraft decayed from orbit (from June 21, 1969, to December 23, 1972). NSSDC has all the useful data that now esist.

该太阳质子监测实验配备了四个独立的探测器，每个探测器均采用一个或多个固态传感器。其中三个探测器分别测量了能量每核子值超过10、30和60 MeV的质子和α粒子的全向通量。α粒子对总计数率的贡献通常低于10%。这些探测器还对能量分别约为0.7、2.0和8.0 MeV的电子敏感。10-MeV通道以每163.8秒两次19.2秒的时间间隔进行采样，而30-MeV和60-MeV通道则每163.8秒采样一次19.2秒。所得的小时平均通量已迅速发表在《太阳地球物理数据》（NOAA，博尔德）。第四个探测器的全视场角为60度，垂直于航天器的自旋轴线。两个鉴别水平分别以每163.8秒两次19.2秒的时间间隔进行采样。分别测量了1至10 MeV/nucleon的质子和α粒子的通量。所有探测器从发射直至航天器从轨道衰变（自1969年6月21日至1972年12月23日）均正常工作。NASA空间科学数据中心（NSSDC）拥有所有现存的有用数据。