Control of Jupiter's radio emission and aurorae by the solar wind

D. A. Gurnett (), W. S. Kurth, G. B. Hospodarsky, A. M. Persoon, P. Zarka, A. Lecacheux, S. J. Bolton, M. D. Desch, W. M. Farrell, M. L. Kaiser, H.-P. Ladreiter, H. O. Rucker, P. Galopeau, P. Louarn, D. T. Young, W. R. Pryor and M. K. Dougherty
Additional contact information
D. A. Gurnett: University of Iowa
W. S. Kurth: University of Iowa
G. B. Hospodarsky: University of Iowa
A. M. Persoon: University of Iowa
P. Zarka: Observatoire de Paris
A. Lecacheux: Observatoire de Paris
S. J. Bolton: Jet Propulsion Laboratory
M. D. Desch: NASA/Goddard Space Flight Center
W. M. Farrell: NASA/Goddard Space Flight Center
M. L. Kaiser: NASA/Goddard Space Flight Center
H.-P. Ladreiter: Space Research Institute, Austrian Academy of Science
H. O. Rucker: Space Research Institute, Austrian Academy of Science
P. Galopeau: Centre d'étude des Environnements, Terrestre et Planétaires, Université de Versailles Saint-Quentin-en-Yvelines (CETP/UVSQ)
P. Louarn: Centre d'Etude Spatiale des Rayonnements (CESR-CNRS), Centre National de la Recherche Scientifique
D. T. Young: Oceanic and Space Science, University of Michigan
W. R. Pryor: Laboratory for Atmospheric and Space Physics (LASP), University of Colorado
M. K. Dougherty: Blackett Laboratory, Imperial College of Science and Technology

Nature, 2002, vol. 415, issue 6875, 985-987

Abstract: Abstract Radio emissions from Jupiter provided the first evidence that this giant planet has a strong magnetic field1,2 and a large magnetosphere3. Jupiter also has polar aurorae4, which are similar in many respects to Earth's aurorae5. The radio emissions are believed to be generated along the high-latitude magnetic field lines by the same electrons that produce the aurorae, and both the radio emission in the hectometric frequency range and the aurorae vary considerably6,7. The origin of the variability, however, has been poorly understood. Here we report simultaneous observations using the Cassini and Galileo spacecraft of hectometric radio emissions and extreme ultraviolet auroral emissions from Jupiter. Our results show that both of these emissions are triggered by interplanetary shocks propagating outward from the Sun. When such a shock arrives at Jupiter, it seems to cause a major compression and reconfiguration of the magnetosphere, which produces strong electric fields and therefore electron acceleration along the auroral field lines, similar to the processes that occur during geomagnetic storms at the Earth.

Date: 2002
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DOI: 10.1038/415985a

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