Search Publications
Lyman-alpha observations of comet Hyakutake with SWAN on SOHO
Schmidt, W.; Bertaux, J. L.; Lallement, R. +7 more
The SWAN instrument on board SOHO is a Lyman-α (Lα) photometer able to map the sky intensity with a resolution of 1°, and a capability of microstepping (0.1°). SWAN is primarily devoted to the study of the large scale distribution of solar wind from its imprints on the interplanetary sky background, but was in addition extensively used to map the …
Cassini uvis observations of Saturns rings
Colwell, Joshua E.; Esposito, Larry W.; McClintock, William E.
The Cassini Ultra-violet Imaging Spectrograph (UVIS) is part of the remote sensing payload of the Cassini Orbiter spacecraft. Its science objectives include investigation of the chemistry, clouds, and energy balance of the Titan and Saturn atmospheres ; neutrals in the magnetosphere ; D/H ratio for Titan and Saturn ; and structure and evolution of…
Correspondence between field aligned currents observed by Ulysses and HST auroral emission
Dougherty, M. K.; Dunlop, M. W.; Prange, R. +1 more
Auroral emission is direct evidence for the magnetophere/ionosphere coupling which exists for a magnetised planet such as Jupiter. This coupling takes place by way of momentum transfer which occurs via field aligned currents. The driving mechanism for the auroral emission is charged particle precipitation along the field lines. During the Ulysses …
Cassini as a heliospheric probe - the potential of pick-up ion measurements during its cruise phase
Fichtner, H.; Mall, U.; Hamilton, D. C. +2 more
Measurements of the spatial distributions of pick-up ions can be utilized to infer important information about the structure of the heliosphere. First, a determination of the symmetry axis of flux distributions of pick-up ions not experiencing any significant filtration of their neutral parent atoms in the heliospheric interface represents a new m…
Ulysses observations of field-perpendicular plasma flows in the Jovian magnetosphere: comparison of ExB velocity vectors derived from energetic ion and thermal electron data
Balogh, A.; McComas, D. J.; Dunlop, M. W. +4 more
The ExB velocity vectors which correspond to the field-perpendicular flow of the low-energy plasma have been independently derived for the Ulysses flyby of Jupiter using energetic ion and thermal electron data. In this paper these measurements are compared. It is shown that reasonable quantitative agreement exists during the prenoon inbound pass, …
Imaging Saturns dust rings using energetic neutral atoms
Krimigis, S. M.; Mitchell, D. G.; Roelof, E. C. +3 more
The intense populations of magnetically trap- ped, energetic charged particles that constitute the radiation belts of Saturn's inner magnetosphere are slowly transported towards the planet by radial diffusion processes. Many of these energetic particles interact with the rings of Saturn and ultimately are lost to the magnetospheric system. Energet…
The Cassini-Huygens SSP refractometer : ref
Geake, J. E.; Mill, C. S.
The refractometer (REF) in the Huygens probe Surface Science Package (SSP) is a linear critical-angle refractometer ; it covers the refractive index range 1.2500-1.4500 with a discrimination of 0.0005, giving an accuracy of about 0.5% in the relative abundance of methane and ethane in the expected mixture on the possibly liquid surface of Titan. L…
An Italian tracking station for Cassini
Ambrosini, R.; Grueff, G.
We present a feasibility study for a 64 m fully steerable parabolic radiotelescope capable of high efficiency operation at frequencies up to 100 GHz. If funds are made available, and construction rapidly started, the antenna would be available in time to be used as a tracking station for the Cassini radio science experiments.
The microwave sensing in the Cassini Mission : the radar
Johnson, W. T. K.; Borgarelli, L.; Im, E. +1 more
The spacecraft of Cassini Mission has been launched towards Saturn on October 1997 to study the physical structure and chemical composition of Saturn as well as all its moons. To this end many instruments have been mounted on the spacecraft ; one of these is the Cassini Radar. Cassini Mission is a cooperative mission between NASA (National Aeronau…
Prospects in astrometry and orbital determination of minor bodies
Carpino, M.
The astrometry of asteroids and comets is undergoing a significant progress, both in accuracy and number of observations, as a consequence of the introduction of CCD devices and the availability of stellar catalogues dense enough to cope with CCD relatively small fields of view. Further, substantial progress in accuracy is expected from the availa…