The magnetic ion-mass spectrometer on Atmosphere Explorer
The magnetic ion-mass spectrometer on Atmosphere Explorer
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DOI：
10.1029/rs008i004p00315
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发表时间：
1973-04
期刊：
影响因子：
1.6
通讯作者：
J. Hoffman;W. B. Hanson;C. Lippincott;E. Ferguson
中科院分区：
文献类型：
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作者：
J. Hoffman;W. B. Hanson;C. Lippincott;E. Ferguson
磁离子质谱仪旨在测量电离层中环境正离子的丰度。它将在飞行中针对减速电位分析仪和圆柱形静电探针进行校准，以给出检测到的离子种类的绝对浓度数据。在浓度高于 103 cm−3 的良好区域中，这些参数的测量精度约为 ±10%。然而，在高度结构化的极地地区，精度可能会有所下降。仪器扫描同时覆盖三个质量范围：1 至 4、4 至 16 和 16 至 64 amu，允许在主（峰值）模式下在 1 秒内测量整个质量范围（1 至 64 amu）。另一种模式是模拟长模式，它将在 9 秒的时间内将质量范围扩展至 90 amu。能够以 1:4:16 的比例锁定任何一组质量数，以提供非常高的空间分辨率，例如，低质量、中质量和高质量范围分别为 500、250 和 125 m。该模式在反旋转卫星定向中最有用，可提供离子浓度的精细结构数据。在旋转模式中，重离子和轻离子的滚动调制最大值之间的相移决定了各个离子漂移速度的垂直分量。可以确定从几 km sec−1 到超过 20 km sec−1 的值。这些数据适用于极地风现象的研究。
The magnetic ion-mass spectrometer is designed to measure the abundances of the ambient positive ions in the ionosphere. It will be calibrated in flight against the retarding-potential analyzer and the cylindrical electrostatic probe to give absolute concentration data for the ion species detected. These parameters can be measured to approximately ±10% in well-behaved regions where concentrations are above 103 cm−3. However, in highly structured polar regions, some degradation in accuracy may be expected. Three mass ranges, covered simultaneously by the scan of the instrument, 1 to 4, 4 to 16, and 16 to 64 amu, permit measurement of the entire mass range, 1 to 64 amu, in 1 sec in the main (peaks) mode. An alternate mode, analog-long, will extend the mass range to 90 amu with a 9-sec period. Capability is provided to lock onto any set of mass numbers in the ratio 1:4:16 to give very high spatial resolution, e.g., 500, 250, and 125 m in the low-, mid-, and high-mass ranges, respectively. This mode will be most useful in the despun satellite orientation to provide fine-structure data on ion concentrations. In the spinning mode the phase shifts between roll modulation maxima of heavy and light ions determine the vertical component of the individual ion-drift velocities. Values from a few km sec−1 to over 20 km sec−1 can be determined. Such data are applicable to the study of polar wind phenomena.