Radio and Plasma Wave Observations at Saturn from Cassini's Approach and First Orbit
Donald A. Gurnett
(1)
,
William S. Kurth
(1)
,
George B. Hospodarsky
(1)
,
A. M. Persoon
(1)
,
Terry F. Averkamp
(1)
,
Baptiste Cecconi
(1, 2, 3)
,
Alain Lecacheux
(4, 2, 3)
,
Philippe Zarka
(4, 2, 3)
,
Patrick Canu
(5)
,
Nicole Cornilleau-Wehrlin
(5)
,
Patrick H. M. Galopeau
(5)
,
A. Roux
(5)
,
C. Harvey
(6)
,
Philippe Louarn
(6)
,
R. Bostrom
(7)
,
G. Gustafsson
(7)
,
Jan-Erik Wahlund
(7)
,
M. D. Desch
(8)
,
William M. Farrell
(8)
,
Michael L. Kaiser
(8)
,
Keith Goetz
(9)
,
P. J. Kellogg
(9)
,
Georg Fischer
(10)
,
Hans Peter Ladreiter
(10)
,
Helmut O. Rucker
(10)
,
H. St. C. Alleyne
(11)
,
A. Pedersen
(12)
1
ISU -
Iowa State University
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 Physique des plasmas
4 Observatoire de Paris
5 CETP - Centre d'étude des environnements terrestre et planétaires
6 CESR - Centre d'étude spatiale des rayonnements
7 IRF - Swedish Institute of Space Physics [Uppsala / Kiruna]
8 GSFC - NASA Goddard Space Flight Center
9 Department of Physics and Astronomy, University of Minnesota
10 ÖAW - Osterreichische Akademie der Wissenschaften = Académie autrichienne des sciences
11 Department of Automatic Control and System Engineering
12 UiO - University of Oslo
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 Physique des plasmas
4 Observatoire de Paris
5 CETP - Centre d'étude des environnements terrestre et planétaires
6 CESR - Centre d'étude spatiale des rayonnements
7 IRF - Swedish Institute of Space Physics [Uppsala / Kiruna]
8 GSFC - NASA Goddard Space Flight Center
9 Department of Physics and Astronomy, University of Minnesota
10 ÖAW - Osterreichische Akademie der Wissenschaften = Académie autrichienne des sciences
11 Department of Automatic Control and System Engineering
12 UiO - University of Oslo
Résumé
We report data from the Cassini radio and plasma wave instrument during the approach and first orbit at Saturn. During the approach, radio emissions from Saturn showed that the radio rotation period is now 10 hours 45 minutes 45 +/- 36 seconds, about 6 minutes longer than measured by Voyager in 1980 to 1981. In addition, many intense impulsive radio signals were detected from Saturn lightning during the approach and first orbit. Some of these have been linked to storm systems observed by the Cassini imaging instrument. Within the magnetosphere, whistler-mode auroral hiss emissions were observed near the rings, suggesting that a strong electrodynamic interaction is occurring in or near the rings.