| Автор | Pedersen, B. M. |
| Автор | Aubier, M. G. |
| Автор | Desch, M. D. |
| Дата выпуска | 1992 |
| dc.description | From January 27 to 30, 1986, while Voyager 2 was outbound from Uranus, the planetary radio astronomy experiment recorded strong (∼3–6 dB) modulations of the broadband smooth Uranian radio emission (Warwick et al., 1987a) at frequencies below 500 kHz. These fluctuations exhibited simultaneously two different time scales (∼100 s and ∼10 s) and were exclusively observed outside the Uranian magnetopause during six planetary rotations. The modulations were only present during a part of the total duration of each broadband smooth episode. This phenomenon is interpreted as being due to propagation effects through the magnetopause. The long‐period modulation is due to the influence of ∼8000‐km wavelength surface waves on Uranus' downstream magnetopause. Such waves have only been studied in detail for the inbound passage (Lepping et al., 1987). The short‐period oscillation might be the signature of a second magnetopause ripple period, similar to that measured by Aubry et al. (1971) for the Earth's magnetopause. There is strong evidence that the surface wave fluctuations causing the scintillations are induced by the solar wind interaction with the magnetosphere. We discuss why these modulations are confined to certain periods of time and to a certain frequency range. |
| Формат | application.pdf |
| Копирайт | Copyright 1992 by the American Geophysical Union. |
| Тема | MAGNETOSPHERIC PHYSICS |
| Тема | Solar wind/magnetosphere interactions |
| Тема | Planetary magnetospheres |
| Тема | Cusp |
| Тема | Magnetopause and boundary layers |
| Тема | PLANETARY SCIENCES: SOLID SURFACE PLANETS |
| Тема | Magnetospheres |
| Тема | PLANETARY SCIENCES: FLUID PLANETS |
| Тема | Magnetospheres |
| Тема | PLANETARY SCIENCES: COMETS AND SMALL BODIES |
| Тема | Magnetospheres |
| Тема | RADIO SCIENCE |
| Тема | Radio astronomy |
| Название | Scintillations of the Uranian kilometric radiation: Implications for the downstream magnetopause |
| Тип | article |
| DOI | 10.1029/92JA00307 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Space Physics |
| Том | 97 |
| Первая страница | 8127 |
| Последняя страница | 8133 |
| Выпуск | A6 |
| Библиографическая ссылка | Aubry, M. P., M. G.Kivelson, C. T.Russell, Motion and structure of the magnetopause, J. Geophys. Res., 76, 1673–1696, 1971. |
| Библиографическая ссылка | Bridge, H. S., et al., Plasma observations near Uranus: Initial results from Voyager 2, Science, 233, 89–93, 1986. |
| Библиографическая ссылка | Desch, M. D., M. L.Kaiser, P.Zarka, A.Lecacheux, Y.Leblanc, M.Aubier, A.Ortega‐Molina, Uranus as a radio source, UranusT.Gehrels, 894–925, University of Arizona Press, Tucson, 1991. |
| Библиографическая ссылка | Fairfield, D. H., Waves in the vicinity of the magnetopause, Magnetospheric Particles and FieldsB. M.McCormac, 67–77, D. Reidel, Hingham, Mass., 1976. |
| Библиографическая ссылка | Gendrin, R., Magnetic turbulence and diffusion processes in the magnetopause boundary layer, Geophys. Res. Lett., 10, 769–771, 1983. |
| Библиографическая ссылка | Gulkis, S., T. D.Carr, The main source of radio emission from the magnetosphere of Uranus, J. Geophys. Res., 92, 15159–15168, 1987. |
| Библиографическая ссылка | Hasegawa, A., Kelvin‐Helmholtz instability, inPlasma Instabilities and Nonlinear Effects,chap. 3.4,Springer‐Verlag,New York,1975. |
| Библиографическая ссылка | Jokipii, J. R., Turbulence and scintillations in the interplanetary plasma, Annu. Rev. Astron. Astrophys., 11, 1–28, 1973. |
| Библиографическая ссылка | Kaiser, M. L., M. D.Desch, S. A.Curtis, The sources of Uranus' dominant nightside radio emissions, J. Geophys. Res., 92, 15169–15176, 1987. |
| Библиографическая ссылка | Kaiser, M. L., M. D.Desch, J. E. P.Connerney, Radio emission from the magnetic equator of Uranus, J. Geophys. Res., 94, 2399–2404, 1989. |
| Библиографическая ссылка | Leblanc, Y., M. G.Aubier, A.Ortega‐Molina, A.Lecacheux, Overview of the Uranian radio emissions: Polarization and constraints on source locations, J. Geophys. Res., 92, 15125–15138, 1987. |
| Библиографическая ссылка | Lecacheux, A., A.Ortega‐Molina, Polarization and localization of the Uranian radio sources, J. Geophys. Res., 92, 15148–15158, 1987. |
| Библиографическая ссылка | Lepping, R. P., L. F.Burlaga, Geomagnetopause surface fluctuations observed by Voyager 1, J. Geophys. Res., 84, 7099–7106, 1979. |
| Библиографическая ссылка | Lepping, R. P., L. F.Burlaga, L. W.Klein, Surface waves on Saturn's magnetopause, Nature, 292, 750–753, 1981. |
| Библиографическая ссылка | Lepping, R. P., L. F.Burlaga, L. W.Klein, Surface waves on Uranus' magnetopause, J. Geophys. Res., 92, 15347–15353, 1987. |
| Библиографическая ссылка | Lovelace, R. V. E., E. E.Salpeter, L. E.Sharp, Analysis of observations of interplanetary scintillations, Astrophys. J., 159, 1047–1055, 1970. |
| Библиографическая ссылка | Ness, N. F., et al., Magnetic fields at Uranus, Science, 233, 85–89, 1986. |
| Библиографическая ссылка | Perrault, S., R.Gendrin, P.Robert, A.Roux, Magnetic pulsations observed onboard GEOS‐2 in the ULF range during multiple magnetopause crossings, Proceedings of Magnetospheric Boundary Layer Conference, Alpbach, June 1979, Eur. Space Agency Spec. Publ., ESA/SP‐148, 113–122, 1979. |
| Библиографическая ссылка | Romig, J. H., D. R.Evans, C. B.Sawyer, A. E.Schweitzer, J. W.Warwick, Models of Uranian continuum radio emission, J. Geophys. Res., 92, 15189–15198, 1987. |
| Библиографическая ссылка | Warwick, J. W., J. B.Pearce, R. G.Peltzer, A. C.Riddle, Planetary radio astronomy experiment for Voyager missions, Space Sci. Rev., 21, 309–327, 1977. |
| Библиографическая ссылка | Warwick, J. W., D. R.Evans, P. B.Dusenbery, Waves on the Uranian downstream magnetopause, J. Geophys. Res., 92, 15367–15375, 1987a. |
| Библиографическая ссылка | Warwick, J. W., D. R.Evans, J. H.Romig, C. B.Sawyer, Radio emissions from Uranus, Adv. Space Res., 712, 243–251, 1987b. |
| Библиографическая ссылка | Zarka, P., A.Lecacheux, Beaming of Uranian nightside kilometric radio emission and inferred source location, J. Geophys. Res., 92, 15177–15188, 1987. |
