INVESTIGADORES
BERTUCCI Cesar
congresos y reuniones científicas
Título:
Properties of Saturn's Magnetopause: Time-Dependent Morphology and Dynamics
Autor/es:
ACHILLEOS, N.; ARRIDGE, C.; BERTUCCI, C. S.; BURTON, M.; DOUGHERTY, M. K.; KHURANA, K. K.; RUSSELL, C. T.; SMITH, E. J.; TSURUTANI, B. T.
Reunión:
Congreso; AGU Fall Meeting 2005; 2005
Resumen:
Magnetopause crossings observed by the Cassini spacecraft's magnetometer
(MAG) instrument have been used to derive a new model for the Kronian
magnetopause [Arridge et al. 2005, submitted] which includes both
pressure-dependent size and shape terms. Our model shows that as the
solar wind pressure increases, the flaring of the model decreases,
consistent with the distribution of particle stresses inside the
magnetosphere. This model is first summarised, compared to models based
on Pioneer and Voyager observations [Slavin et al. 1985; Maurice et al.
1996], and then applied to regularly sampled orbits of the spacecraft in
order to build up a statistical distribution of the subsolar (standoff)
distance of the magnetopause surface. The orbital data used indicate
that the most probable standoff distance is in the range 24-28 Saturn
radii, corresponding to solar wind dynamic pressures 0.01 to 0.02 nPa.
Unlike the case of Jupiter, the distribution of standoff distances is
consistent with a normal distribution and shows no evidence for
bimodality.