| タイトル | Dynamic evolution of low-energy ions in the terrestrial magnetosphere |
| 著者（英） | Waite, J. H., Jr.; Giles, B. L.; Horwitz, J. L.; Moore, T. E.; Chappell, C. R. |
| 著者所属（英） | NASA Marshall Space Flight Center|Alabama Univ. |
| 発行日 | 1988-01-01 |
| 言語 | eng |
| 内容記述 | Results of a statistical study of low-energy (0-50 eV) field-aligned ion pitch angle distributions for H(+), He(+), and O(+) observed by the Dynamics Explorer retarding ion mass spectrometer instrument are presented. Ion distributions are characterized as uni- and bi-directional field-aligned and bi-directional conic distributions. The spatial relationships of these distributions can be interpreted as dynamic evolution of low-energy ion flow in which injected unidirectional field-aligned streams originating in the nightside auroral zone evolve first into bi-directional flows under the influence of convection in the mirror magnetic field configuration. Characteristic convection times are evaluated with a pitch angle diffusion model in which field-aligned flows evolve into conical distributions through charge exchange loss of particles to the atmosphere during particle mirroring periods. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 89A13799 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/367199 |
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