| Автор | Acuña, M. H. |
| Автор | Connerney, J. E. P. |
| Автор | Ness, N. F. |
| Дата выпуска | 1993 |
| dc.description | A simplified description of the Neptunian magnetic field derived from the Goddard Space Flight Center/Bartol Research Institute I8E1 model which includes internal terms up to and including the octupole (but no external terms) has been used to compute numerically L shell values along the Voyager 2 encounter trajectory and those associated with the N1 through N6 moons and N1R through N6R rings. The complex magnetic field geometry and the rapid rotation of the planet combine to produce an expectation of numerous times when absorption signatures should be observed as a result of the interaction between the trapped particle population and the Neptunian moons and rings. Thus a complete understanding of the observed charged particle fluxes and their variation along the Voyager 2 trajectory must take into account these geometrically anticipated interactions. Similar to Uranus, the large tilt between the dipole term and the rotation axis causes the moons and rings to sweep a very large range of L shells. Furthermore, their orbital motion introduces additional periodicities, causing the maxima and minima in L space to vary systematically with time. The unambiguous association of predicted and observed absorption signatures and times with a particular ring or moon is made very difficult by the superposition of many individual effects. The extremely rapid excursion in L space by Voyager 2 near closest approach, a region most significant for magnetic field models, apparently does not facilitate the unique associations previously used at other planets to provide an independent assessment of the global accuracy of the mathematical models of the field which are inherently nonunique. |
| Формат | application.pdf |
| Копирайт | Copyright 1993 by the American Geophysical Union. |
| Тема | MAGNETOSPHERIC PHYSICS |
| Тема | Energetic particles: trapped |
| Тема | Magnetosphere interactions with satellites and rings |
| Тема | Planetary magnetospheres |
| Тема | PLANETARY SCIENCES: SOLID SURFACE PLANETS |
| Тема | Planetology: Solid Surface Planets and Satellites: Magnetic fields |
| Тема | Magnetospheres |
| Тема | PLANETARY SCIENCES: FLUID PLANETS |
| Тема | Magnetospheres |
| Тема | PLANETARY SCIENCES: COMETS AND SMALL BODIES |
| Тема | Magnetospheres |
| Название | Neptune's magnetic field: Calculation of field geometric invariants derived from the I8E1 GSFC/BRI model |
| Тип | article |
| DOI | 10.1029/92JA02981 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Space Physics |
| Том | 98 |
| Первая страница | 11275 |
| Последняя страница | 11284 |
| Выпуск | A7 |
| Библиографическая ссылка | Acuña, M. H., N. F.Ness, The main magnetic field of Jupiter, J. Geophys. Res., 81, 2917–2922, 1976. |
| Библиографическая ссылка | Acuña, M. H., J. E. P.Connerney, N. F.Ness, Implications of the GSFC Q<sub>3</sub> model for trapped particle motion, J. Geophys. Res., 93, 5505–5512, 1988. |
| Библиографическая ссылка | Cheng, A. F., Triton torus and Neptune aurora, Geophys. Res. Lett., 17, 1669–1672, 1990. |
| Библиографическая ссылка | Connerney, J. E. P., M. H.Acuña, N. F.Ness, The magnetic field of Uranus, J. Geophys. Res., 92, 15234–15248, 1987. |
| Библиографическая ссылка | Connerney, J. E. P., M. H.Acuña, N. F.Ness, The magnetic field of Neptune, J. Geophys. Res., 96, 19023–19042, 1991. |
| Библиографическая ссылка | Cooper, J. F., Satellite sweeping of electrons at Neptune and Uranus, Geophys. Res. Lett., 17, 1665–1668, 1990. |
| Библиографическая ссылка | Dessler, A. J., Physics of the Jovian Magnetosphere, Cambridge University Press, New York, 1983. |
| Библиографическая ссылка | Krimigis, S. M. K., et al., Hot plasma and energetic particles in Neptune's magnetosphere, Science, 246, 1483–1489, 1989. |
| Библиографическая ссылка | Mauk, B. H., M.Kane, E. P.Keath, A. F.Cheng, S. M.Krimigis, T. P.Armstrong, N. F.Ness, Energetic charged particle angular distributions near (r < 2 R<sub>N</sub>) and over the pole of Neptune, Geophys. Res. Lett., 17, 1701–1704, 1990. |
| Библиографическая ссылка | Mauk, B. H., E. P.Keath, M.Kane, S. M.Krimigis, A. F.Cheng, M. H.Acuña, T. P.Armstrong, N. F.Ness, The magnetosphere of Neptune: Hot plasmas and energetic particles, J. Geophys. Res., 96, 19061–19084, 1991. |
| Библиографическая ссылка | McIlwain, C., Magnetic coordinates, Space Sci. Rev., 5, 585–598, 1966. |
| Библиографическая ссылка | Ness, N. F., M. H.Acuña, K. W.Behannon, L. F.Burlaga, J. E. P.Connerney, R. P.Lepping, F. M.Neubauer, Magnetic fields at Uranus, Science, 233, 85–89, 1986. |
| Библиографическая ссылка | Ness, N. F., M. H.Acuña, K. W.Behannon, L. F.Burlaga, J. E. P.Connerney, R. P.Lepping, F. M.Neubauer, Magnetic fields at Neptune, Science, 246, 1473–1478, 1989. |
| Библиографическая ссылка | Paonessa, M. T., A. F.Cheng, Satellite sweeping in offset, tilted dipole fields, J. Geophys. Res., 92, 1160–1166, 1987. |
| Библиографическая ссылка | Paranicas, C. P., A. F.Cheng, Theory of ring sweeping of energetic particles, J. Geophys. Res., 96, 19123–19129, 1991a. |
| Библиографическая ссылка | Paranicas, C. P., A. F.Cheng, Satellite sweeping of energetic particles at Neptune, J. Geophys. Res., 96, 19131–19136, 1991b. |
| Библиографическая ссылка | Roberts, C. S., Coordinates for the study of particles trapped in the Earth's magnetic field: A method of converting from B, L to R, Γ coordinates, J. Geophys. Res., 69, 5089–5090, 1964. |
| Библиографическая ссылка | Roederer, J. G., Dynamics of Geomagnetically Trapped Radiation, Springer‐Verlag, New York, 1970. |
| Библиографическая ссылка | Schulz, M., L. J.Lanzerotti, Particle Diffusion in the Radiation Belts, Springer‐Verlag, New York, 1974. |
| Библиографическая ссылка | Selesnick, R. S., E. C.Stone, Neptune's cosmic ray cutoff, Geophys. Res. Lett., 18, 361–364, 1991a. |
| Библиографическая ссылка | Selesnick, R. S., E. C.Stone, The electron absorption signature of 1989 N1, J. Geophys. Res., 96, 19137–19147, 1991b. |
| Библиографическая ссылка | Selesnick, R. S., E. C.Stone, Energetic particle signatures of satellites and rings in Neptune's magnetosphere, Adv. Space Res., 12, 1171–1179, 1992. |
| Библиографическая ссылка | Stone, E. C., The physical significance and application of L, B<sub>0</sub>, and R<sub>0</sub> to geomagnetically trapped particles, J. Geophys. Res., 68, 4157–4166, 1963. |
| Библиографическая ссылка | Stone, E. C., E. D.Miner, The Voyager 2 encounter with the Neptunian system, Science, 246, 1417–1421, 1989. |
| Библиографическая ссылка | Stone, E. C., A. C.Cummings, M. D.Looper, R. S.Selesnick, N.Lal, F. B.McDonald, J. H.Trainor, D. L.Chenette, Energetic charged particles in the magnetosphere of Neptune, Science, 246, 1489–1494, 1989. |
| Библиографическая ссылка | Warwick, J. W., et al., Voyager planetary radio astronomy at Neptune, Science, 246, 1498–1501, 1989. |
