| タイトル | Mass density and pressure changes across the dayside magnetopause |
| 著者（英） | Fuselier, S. A.; Klumpar, D. M.; Shelley, E. G. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1993-03-01 |
| 言語 | eng |
| 内容記述 | Plasma composition measurements at about 2-min time resolution from 27 magnetopause crossings are used to determine if mass density rho, modified by the anisotropic pressure term (1-alpha), is constant across the magnetopause. Pressure and mass density in the magnetosheath and low-latitude boundary layer were found to be dominated by H(+) except on one occasion when O(+) was the dominant contributor to the total mass density in the low-latitude boundary layer. Using these measurements, it is found that rho(1-alpha) is not constant for almost all magnetopause crossings even when there is independent evidence for magnetic reconnection and an open magnetopause. These results indicate that the reason why rho(1-alpha) is not constant across the magnetopause is that the H(+) density decrease from the magnetosheath to the low-latitude boundary layer is not compensated for by either a change in the pressure anisotropy or a change in the total mass density and suggest that the magnetopause can never be described as a time-stationary 1D rotational discontinuity. |
| NASA分類 | GEOPHYSICS |
| レポートNO | 93A30822 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/319147 |
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