MMS 4 Hot Plasma Composition Analyzer (HPCA) Ions, Level 2 (L2), Burst Mode, 0.625 s Data

Hot Plasma Composition Analyzer (HPCA) Ions, Level 2, Burst Survey, 0.625 s Data. The MMS HPCA instruments measure the energy and composition of magnetospheric plasmas in the energy range from 1 eV to 40 keV. An electrostatic energy analyzer (ESA) that is optically coupled to a carbon-foil based Time-of-Flight (TOF) section comprises each HPCA. The basic HPCA data product is an array of counts for 5 ion species, at 63 energies, for each of 16 elevation anodes. Sixteen basic products, also called azimuths, are acquired every 0.625 s; half a spacecraft spin period nominally has 16 azimuths. The five ion species are protons (H+), alpha particles (He++), helium ions (He+), singly charged Oxygen (O+), and background counts.

热等离子体成分分析仪（Hot Plasma Composition Analyzer，HPCA）离子数据，Level 2级，突发观测，0.625秒分辨率数据。磁层多尺度任务（Magnetospheric Multiscale Mission，MMS）的HPCA仪器用于测量能量范围在1电子伏特（eV）至40千电子伏特（keV）之间的磁层等离子体的能量与成分。每台HPCA均由静电能量分析仪（Electrostatic Energy Analyzer，ESA）与基于碳箔的飞行时间（Time-of-Flight，TOF）段光学耦合构成。HPCA的基础数据产品是一个计数阵列，涵盖5种离子种类、63个能量点及16个仰角阳极各自的计数。每0.625秒采集16个基础产品（亦称为方位角数据）；航天器自旋周期的一半通常包含16个方位角数据。这五种离子种类为质子（H+）、α粒子（He++）、氦离子（He+）、单电荷氧离子（O+）以及背景计数。