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Radiation transport of heliospheric Lyman-α from combined Cassini and Voyager data sets

Quemerais, E.; Möbius, E.; Bzowski, M. +15 more

Aims: Heliospheric neutral hydrogen scatters solar Lyman-α radiation from the Sun with “27-day” intensity modulations observed near Earth due to the Sun's rotation combined with Earth's orbital motion. These modulations are increasingly damped in amplitude at larger distances from the Sun due to multiple scattering in the heliosphere, providing a …

Titan's rotation. A 3-dimensional theory

Vienne, A.; Noyelles, B.; Lemaître, A.

Aims:We study the forced rotation of Titan seen as a rigid body at the equilibrium Cassini state, involving the spin-orbit synchronization.
Methods: We used both the analytical and the numerical ways. We analytically determined the equilibrium positions and the frequencies of the 3 free librations around it, while a numerical integration assoc…