Search Publications
Production of gyrating ions from nonlinear wave-particle interaction upstream from the Earth's bow shock: A case study from Cluster-CIS
Lundin, R.; Balogh, A.; Dandouras, I. +14 more
We present observations of E<40 keV/e backstreaming ions measured by the Cluster Ion Spectrometry experiment at 1-2 RE upstream of the bow shock. The ions are simultaneously observed at all three spacecrafts for which CIS measurements are available. The proton distributions are analyzed using 4 s time resolution. They are observed in…
Experimental simulation of Titan's atmosphere: Detection of ammonia and ethylene oxide
Coustenis, A.; Coll, P.; Raulin, F. +1 more
For several years now, an experimental simulation of Titan's atmosphere has been on going at LISA. A cold plasma is established in a gas mixture representative of the atmosphere of the satellite. In these experiments, more than 70 organic compounds have been identified, including the first identification in this type of experimental simulation of …
Cassini RADAR: prospects for Titan surface investigations using the microwave radiometer
Lorenz, Ralph D.; West, Richard D.; Janssen, Michael A. +3 more
The Radar instrument on the Cassini spacecraft can be used in a passive radiometric mode to map the microwave emission from Titan: these will be the first resolved microwave emission measurements of an icy satellite. Observation plans and the theory for their interpretation is presented: these data should be able to provide crude composition maps …
The Earth's quasi-parallel bow shock: Review of observations and perspectives for Cluster
Wilkinson, William P.
Spacecraft crossings of the Earth's quasi-parallel bow shock under typical high Mach number conditions are characterized by the presence of large-amplitude, compressive, low-frequency magnetic pulsations. Thus, instead of the fairly abrupt jump from upstream to downstream states one associates with their quasi-perpendicular counterparts, quasi-par…
Bursty energetic electrons confined in flux ropes in the cusp region
Balogh, A.; Zong, Q. -G.; Daly, P. W. +6 more
Bursty energetic electron events with energies of about 20- 400 keV have been observed in the cusp region when the CLUSTER S/C were travelling outbound on 5 April 2001. These electron events are characterized by strong impulsive increases in the flux whereas energetic ions (>30 keV) show no obvious changes. The enhanced energetic electron flux …
First evidence of IMF control of Jovian magnetospheric boundary locations: Cassini and Galileo magnetic field measurements compared
Kivelson, Margaret G.; Southwood, David J.
The Cassini spacecraft, en route to Saturn, passed close to Jupiter while the Galileo spacecraft was completing its 28th and 29th orbits of Jupiter, thus offering a unique opportunity for direct study of the solar wind-Jovian interaction. Here evidence is given of response of the Jovian magnetopause and bow shock positions to changes of the north-…
Structural analysis of periodic surface waves on the magnetospheric boundary
Roth, M.; De Keyser, J.
In situ observations of the flanks of the magnetospheric boundary (magnetopause and boundary layer) sometimes show periodic surface waves to be present. We propose a straightforward but powerful technique for analyzing such periodic boundary waves. The result of this analysis is a two-dimensional picture of the structure of the wave in a reference…
ISO observations of the giant planets and Titan: what have we learnt?
Encrenaz, Thérèse
Infrared spectroscopic observations of the giant planets and Titan with the Infrared Space Observatory (ISO) have brought a significant contribution to our knowledge of these objects. The main discoveries achieved by ISO are: (1) the first detection of an external oxygen source for all giant planets and Titan; (2) the first detection of new strato…
Modeling radio emission attenuation lanes observed by the Galileo and Cassini spacecraft
Gurnett, D. A.; Hospodarsky, G. B.; Kurth, W. S. +3 more
The Cassini gravity-assisted flyby of Jupiter provided an opportunity to investigate radio emission attenuation lanes that were previously observed in the Voyager and Galileo data. The Cassini radio and plasma wave science (RPWS) investigation is the most advanced plasma wave instrument to visit the Jovian system, measuring electric fields over th…
Inverse radiation modeling of Titan's atmosphere to assimilate solar aureole imager data of the Huygens probe
Keller, H. U.; Grieger, B.; Markiewicz, W. J. +1 more
During the descent of the Huygens probe through Titan's atmosphere in January 2005, the Descent Imager/Spectral Radiometer (DISR) will perform upward and downward looking measurements at various spectral ranges and spatial resolutions. This internal radiation density could be estimated by radiative transfer calculations for Titan's atmosphere. How…