Development of high time resolution ion mass spectrometer for ionospheric ions

了解低电离层中具有热能的各种离子是如何获得非热能的，对于了解极区电离层中离子的逃逸机制尤为重要。我们研制了一台星载离子质谱仪，用于观测与离子逃逸有关的超热离子。此外，我们新开发了一个低能离子束发生器，因为超热能的离子需要用于离子质谱仪的实验室校准。

To know how the respective ion species of thermal energy in the lower ionosphere obtain nonthermal energies is especially important for the understanding of the ion escape mechanisms in the polar ionosphere. We have developed a space-borne ion mass spectrometer for observations of the suprathermal ions related to the ion escape. In addition, we newly developed a low energy ion beam generator because ions of suprathermal energy are required for the laboratory calibration of the ion mass spectrometer.