Radial mass transport and rotational dynamics
| Autor: | Duane H. Pontius |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Physics
Atmospheric Science Angular acceleration Angular momentum Angular frequency Ecology Field line Paleontology Soil Science Magnetosphere Forestry Angular velocity Aquatic Science Oceanography Jovian Computational physics Dipole Geophysics Classical mechanics Space and Planetary Science Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Astrophysics::Earth and Planetary Astrophysics Earth-Surface Processes Water Science and Technology |
| Zdroj: | Journal of Geophysical Research: Space Physics. 102:7137-7150 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/97ja00289 |
| Popis: | The main source of plasma in the Jovian magnetosphere is Io and the dominant sink is outward radial transport. Conservation of angular momentum leads to a decrease in angular velocity with distance, but ionospheric coupling resists any departure from corotation. Competition between these effects predicts a radial dependence for the lag that agrees with observations out to some moderate distance in the middle magnetosphere. However, the observed angular velocity farther out appears to saturate at roughly half the planetary angular frequency, in contrast to the theoretical prediction that it continue to decrease asymptotically to zero. This paper reviews the theory of this phenomenon and explores three of its underlying assumptions as candidates for explaining this discrepancy: (1) Field line stretching from the assumed dipole configuration; (2) a variation in the ratio of the average angular velocity to the average weighted by mass outflux; and (3) a nonlinear response in the atmospheric component of the system. |
| Databáze: | OpenAIRE |
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