Pluto's Interaction With Energetic Heliospheric Ions.

Pluto energies of a few kiloelectron volts and suprathermal ions with tens of kiloelectron volts and above. We measure this population using the Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) instrument on board the New Horizons spacecraft that flew by Pluto in 2015. Even though the measured ions have gyroradii larger than the size of Pluto and the cross section of its magnetosphere, we find that the boundary of the magnetosphere is depleting the energetic ion intensities by about an order of magnitude close to Pluto. The intensity is increasing exponentially with distance to Pluto and reaches nominal levels of the interplanetary medium at about 190R P distance. Inside the wake of Pluto, we observe oscillations of the ion intensities with a periodicity of about 0.2 hr. We show that these can be quantitatively explained by the electric field of an ultralow-frequency wave and discuss possible physical drivers for such a field. We find no evidence for the presence of plutogenic ions in the considered energy range.

Pluto's interaction with its space environment: Solar wind, energetic particles, and dust.

The New Horizons spacecraft carried three instruments that measured the space environment near Pluto as it flew by on 14 July 2015. The Solar Wind Around Pluto (SWAP) instrument revealed an interaction region confined sunward of Pluto to within about 6 Pluto radii. The region's surprisingly small size is consistent with a reduced atmospheric escape rate, as well as a particularly high solar wind flux. Observations from the Pluto Energetic Particle Spectrometer Science Investigation (PEPSSI) instrument suggest that ions are accelerated and/or deflected around Pluto. In the wake of the interaction region, PEPSSI observed suprathermal particle fluxes equal to about 1/10 of the flux in the interplanetary medium and increasing with distance downstream. The Venetia Burney Student Dust Counter, which measures grains with radii larger than 1.4 micrometers, detected one candidate impact in ±5 days around New Horizons' closest approach, indicating an upper limit of <4.6 kilometers(-3) for the dust density in the Pluto system.

[Alcohol consumption in patients with psychiatric disorders: assessment and treatment]. / Usage d'alcool chez les patients souffrant de troubles psychiatriques : quelles évaluations ? Quelle prise en soin ?

Alcohol consumption in France exceeds the European average (12.7L of pure alcohol/habitant/year in 2009 for an average of 12.5 L). This consumption has a major professional, social and health impact on the individuals and their families. The cost of such, estimated in Europe to be of 155.8 billion Euros in 2010, is the highest among the central nervous system diseases in Europe, far higher than that of depression or dementia. Patients suffering from psychiatric disorders are more frequently affected by problems related to alcohol use than the general population. They are also more vulnerable to the immediate and subsequent consequences of their consumption. The alcohol related disorders that are often accompanied by risk taking and other addictive behaviour require a global assessment of the addiction, with and without substance, and of the complications. These have a strong impact on risk taking, compliance with care, and the morbidity of somatic and psychiatric disorders, as well as access to optimal care and the life span of patients suffering from psychiatric disorders. The development of addictology care, with integrative treatment programs, is recommended in response to these public health issues. Nevertheless, specific addictology practices and partners with addictology care structures are still scarcely developed in psychiatry. Firstly, it would be necessary to set up such integrated treatments through the systematisation of an "addictology" checkup on admission, a global assessment of addictive behaviour and cognitive disorders, using pragmatic tools that are user-friendly for the care teams, maintain the reduction in risk taking, and apply prescriptions for addiction to psychotropic treatments, in liaison with the referring general practitioner. As early as possible, accompanied by specific training in addictology for the psychiatrists and the mental health nursing teams, such care could be enhanced by the development of liaison and advanced psychiatric consultation teams, specialised in addictology, together with the installation of a addictology care network in supplementary psychiatry of levels 1, 2 and 3 in addictology. This network of specific care would notably permit the integrated management of patients suffering from acute psychiatric disorders or requiring care under constraint. More specific care networks for particular problems (maternity issues, adolescence, HIV and hepatitis, cognitive disorders…) and programs of therapeutic education could reinforce this proposal within a protocol of care that should be legible, coherent and coordinated. The psychiatrist and the addictologist must therefore learn to work together over and above the dogmatic boundaries and positioning in a constructive and efficient partnership, beneficial for the patient.

Energetic particles in the jovian magnetotail.

When the solar wind hits Jupiter's magnetic field, it creates a long magnetotail trailing behind the planet that channels material out of the Jupiter system. The New Horizons spacecraft traversed the length of the jovian magnetotail to >2500 jovian radii (RJ; 1 RJ identical with 71,400 kilometers), observing a high-temperature, multispecies population of energetic particles. Velocity dispersions, anisotropies, and compositional variation seen in the deep-tail (greater, similar 500 RJ) with a approximately 3-day periodicity are similar to variations seen closer to Jupiter in Galileo data. The signatures suggest plasma streaming away from the planet and injection sites in the near-tail region (approximately 200 to 400 RJ) that could be related to magnetic reconnection events. The tail structure remains coherent at least until it reaches the magnetosheath at 1655 RJ.

Dynamics of Saturn's magnetosphere from MIMI during Cassini's orbital insertion.

The Magnetospheric Imaging Instrument (MIMI) onboard the Cassini spacecraft observed the saturnian magnetosphere from January 2004 until Saturn orbit insertion (SOI) on 1 July 2004. The MIMI sensors observed frequent energetic particle activity in interplanetary space for several months before SOI. When the imaging sensor was switched to its energetic neutral atom (ENA) operating mode on 20 February 2004, at approximately 10(3) times Saturn's radius RS (0.43 astronomical units), a weak but persistent signal was observed from the magnetosphere. About 10 days before SOI, the magnetosphere exhibited a day-night asymmetry that varied with an approximately 11-hour periodicity. Once Cassini entered the magnetosphere, in situ measurements showed high concentrations of H+, H2+, O+, OH+, and H2O+ and low concentrations of N+. The radial dependence of ion intensity profiles implies neutral gas densities sufficient to produce high loss rates of trapped ions from the middle and inner magnetosphere. ENA imaging has revealed a radiation belt that resides inward of the D ring and is probably the result of double charge exchange between the main radiation belt and the upper layers of Saturn's exosphere.