A regular period for Saturn's magnetic field that may track its internal rotation
- G. Giampieri, M. Dougherty, E. Smith, C. Russell
- Physics, GeologyNature
- 4 May 2006
The rotation rate of a planet is one of its fundamental properties. Saturn's rotation, however, is difficult to determine because there is no solid surface from which to time it, and the alternative…
Cassini Magnetometer Observations During Saturn Orbit Insertion
- M. Dougherty, N. Achilleos, B. Tsurutani
- PhysicsScience
- 25 February 2005
The current sheet within the magnetosphere is thinner and more extended, and the external magnetic field is different compared with past spacecraft observations, and small diamagnetic cavities and ion cyclotron waves of types that were not reported before are observed.
Modelling of the ring current in Saturn's magnetosphere
- G. Giampieri, M. Dougherty
- Physics
- 2004
Abstract. The existence of a ring current inside Saturn's magnetosphere was first suggested by Smith et al. (1980) and Ness et al. (1981, 1982), in order to explain various features in the magnetic…
Cassini observations of planetary‐period magnetic field oscillations in Saturn's magnetosphere: Doppler shifts and phase motion
- S. Cowley, D. Wright, T. Robinson
- Physics
- 1 April 2006
Cassini magnetic field observations show that few‐nT oscillations near the planetary rotation period, first observed in Pioneer‐11 and Voyager‐1 and ‐2 fly‐by data, are essentially ubiquitous in…
Rotation rate of Saturn's interior from magnetic field observations
- G. Giampieri, M. Dougherty
- Physics, Geology
- 1 August 2004
Analysis of magnetic field data from the Pioneer 11, Voyager 1 and Voyager 2 spacecraft produced the first models of Saturn's internal field. One striking feature of these models is the lack of non…
Doppler Measurements of the Quadrupole Moments of Titan
- N. Rappaport, B. Bertotti, G. Giampieri, J. Anderson
- Physics
- 1 April 1997
Abstract Measurements of the Doppler frequency change in a microwave beam sent to and transponded back from an interplanetary spacecraft are very sensitive to the quadrupole gravitational field of a…
A Hidden Markov Model of Default Interaction
- M. Crowder, Mark H. A. Davis, G. Giampieri
- Computer Science
- 2003
The occurrence of defaults within a bond portfolio is modeled as a simple hidden Markov process. The hidden variable represents the risk state, which is assumed to be common to all bonds within one…
A note on the tidally induced potential of a satellite in eccentric orbit
- G. Giampieri
- Physics, Geology
- 2004
Modelling of magnetic field measurements at Mercury
- G. Giampieri, A. Balogh
- Physics
- 1 December 2001
Mercury's thermoelectric dynamo model revisited
- G. Giampieri, A. Balogh
- Physics, Geology
- 1 June 2002
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