Publications

2015

• Triggering of plasma resonance by Whisper sounder on distant Cluster Spacecraft in Solar Wind
  
  • Canu Patrick
  • Décréau Pierrette
  • Rauch Jean-Louis
  • Vallières Xavier
  • Galkina I.
  • Piberne Rodrigue
  , 2015.
• Comparison of the effect of sawtooth-like voltage waveforms on discharge dynamics of Ar, H<SUB>2</SUB>, and CF<SUB>4</SUB> plasmas
  
  • Bruneau Bastien
  • Johnson Erik
  • Gans T.
  • Greb Arthur
  • Korolov Ihor
  • Derszi Aranka
  • Donkó Z.
  • Brandt S.
  • Schuengel E.
  • Schulze J.
  • Economou D. J.
  • Diomede P.
  • Longo S.
  • Lafleur Trevor
  • Booth Jean-Paul
  • O'Connell D.
  , 2015.
• Solar wind turbulence at kinetic scales: Cluster observations
  
  • Alexandrova O.
  • Perrone D.
  • Lion S.
  • Lacombe C.
  • Matteini L.
  • Maksimovic M.
  • Rossi C.
  • Sorriso-Valvo L.
  • Cornilleau-Wehrlin Nicole
  • Dandouras I.
  • Mangeney A.
  , 2015.
• Les Plasmas de Fusion Magnétique : une matière pleine de surprises
  
  • Campos Pinto Martin
  • Morel Pierre
  , 2015.
• Study of Magnetic Reconnection in Turbulent Plasma Using Satellite Data
  
  • Chasapis Alexandros
  , 2015. Magnetic reconnection is a fundamental energy conversion process in plasma. It occurs in thin regions of strong current known as current sheets and results in particle heating and acceleration. In turbulence, which is ubiquitous in space plasma, magnetic reconnection has been observed to occur in small scale structures that form therein, and is thought to contribute to dissipation of turbulent energy at kinetic scales. For this work we examine data from the Cluster spacecraft in the Earth's magnetosheath, downstream of the quasi-parallel shock. The detection of ion-scale current sheets was performed by implementing the PartialVariance of Increments (PVI) method for multiple spacecraft. The properties of the observed current sheets were different for high (> 3) and low (< 3) values of the PVI index. We observed a distinct population of high PVI (> 3) structures that accounted for ~ 20% of the total. Those current sheets have high magneticshear (> 90degrees). In order to estimate the local heating occurring within those current sheets, a proxy of the electron temperature was obtained at high time resolution(125ms) from the partial distributions measured by Cluster. This allowed for the first time to study the localized electron heating within ion-scale currentsheets. The observed enhancement of the estimated electron temperature withinthe high PVI current sheets suggest that they are important for local electron heating and energy dissipation. We also examined measurements inside the diffusion region of a thin reconnecting current sheet. Multi-spacecraft observationsallow as to study electron distributions and wave activity at different distances from the x-line. Significant differences were observed in the electron populations as they were heated going through the current sheet. In particular electrons were heated in the direction parallel to the magnetic field in close proximity to thex-line, whereas no significant variation was observed in the perpendicular direction. However, the distribution was more isotropic downstream of the x-line with electrons heated in the perpendicular direction.
• Gas Temperature Measurements in Plasmas by High-Resolution TALIF
  
  • Booth Jean-Paul
  • Guaitella Olivier
  • Marinov Daniil
  • Foucher Mickaël
  • Drag Cyril
  • Cabaret Louis
  , 2015.
• On the nature of MHD and kinetic scale turbulence in the magnetosheath of Saturn: Cassini observations
  
  • Hadid Lina
  • Sahraoui Fouad
  • Kiyani K. H.
  • Retinò Alessandro
  • Modolo Ronan
  • Canu Patrick
  • Masters A.
  • Dougherty M.
  , 2015, 10, pp.EPSC2015-306. Low frequency turbulence in Saturn’s magnetosheath is investigated using in-situ measurements of the Cassini spacecraft. We focus on the magnetic en- ergy spectra computed in the frequency range ∼ [10−4 , 1]Hz. Three main results are reported: 1) The magnetic energy spectra showed a ∼ f−1 scaling at MHD scales followed by an ∼ f−2.6 scaling at the sub-ion scales without forming the so-called inertial range, breaking the universality of the Kolmogorov spectrum in the magnetosheath; 2) The magnetic com- pressibility and the cross-correlation between the par- allel component of the magnetic field and density fluctuations C(δn, δB||) indicate the dominance of the compressible magnetosonic slow modes at MHD scales rather than the Alfvén mode [3] ; 3) Higher order statistics revealed a monofractal (resp. multi- fractal) behaviour of the turbulent flow behind a quasi- perpendicular (resp. quasi-parallel) shock at the sub- ion scales.
• Absorption spectroscopy in CO<SUB>2</SUB> and air plasma with QCL: from gas traces to vibrational excitation measurements
  
  • Guaitella Olivier
  • Barakat Christelle
  • Marinov Daniil
  • Welzel S.
  • Engeln Richard
  , 2015.
• First MMS measurements of the High Frequency Magnetic Waves
  
  • Le Contel Olivier
  • Roux A.
  • Mirioni Laurent
  • Retinò Alessandro
  • Sahraoui Fouad
  • Lavraud Benoit
  • Aunai N.
  • Leroy Paul
  • Mansour Malik
  • Alison Dominique
  • Burch James L.
  • Torbert Roy B.
  • Ergun Robert E.
  • Summers David
  • Needell Jerry
  • Chutter Mark
  • Rau David
  • Dors Ivan
  • Russell Christopher T.
  • Magnes Werner
  • Strangeway Robert J.
  • Broumund Kenneth R.
  • Plaschke Ferdinand
  • Fischer David
  • Leinweber Hannes Karl
  • Anderson Brian J.
  • Argall Matthew R.
  • Le Guan
  • Slavin J. A.
  • Kepko Larry
  • Baumjohann W.
  • Lindqvist Per-Arne
  • Khotyaintsev Y. V.
  • Marklund Goran Tage
  • Nakamura R.
  • Pollock Craig J.
  • Mauk Barry
  • Fuselier Stephen A.
  , 2015. The MMS mission was successfully launched on March 13, 2015 into an equatorial, highly elliptical orbit with a low altitude perigee and an apogee of 12 earth radii. Each satellite is equipped by a search-coil magnetometer (SCM) which measures the three components of the magnetic field fluctuations with a nominal frequency range from 1 Hz to 6 kHz. During the past months of the commissioning phase, the SCM waveforms have usually been gathered at 128 or 256 samples per second (S/s). Yet in a few cases, burst data corresponding to 8192 S/s were obtained. Since the launch, the orbit apogee has moved from dawn to dusk. These various conditions allow us to present high frequency wave measurements and wave polarization analysis in the dawn magnetosphere flank as well as associated with local and global dipolarization events in the night side. Furthermore, the SCM is not saturated due to a large amplitude spin modulation even at perigee since the MMS spin frequency is low (50 mHz). Thanks to the onboard spectra computed by the digital signal processor, we are able to continuously monitor the magnetic wave activity through the full SCM frequency range all along the orbit and notably in the radiation belt region. Thus some typical figures of the wave activity in the inner magnetosphere are also briefly described.
• Interferometric study of low density channels and guided electric discharges induced in air by laser femtosecond filaments
  
  • Point Guillaume
  • Arantchouk Léonid
  • Mysyrowicz André
  • Houard Aurélien
  , 2015.
• Scientific studies of space in Africa: The challenges
  
  • Amory-Mazaudier Christine
  , 2015. After the International Geophysical Year IGY, in 1957, several studies on the Earths magnetic field, and Ionosphere were developed in Africa. During the sixties, seventies and eighties , international African scientists (P. Gouin, C.A Onwumechili, O. Fambitakoye, S. Ogunade etc) with European and American scientists (P.N. Mayaud, P. Vila, A. Richmond etc) have find major results in Geomagnetism, and Ionospheric studies in equatorial Africa. In a first part we review the main advances made by African Scientists by the past. In a second part we present the results on equatorial geophysics obtained since several decades in American and Asian sectors and the topics to develop in research in Africa.
• Models of various microplasma sources to produce reactive oxygen species
  
  • Chabert Pascal
  • Lazzaroni Claudia
  , 2015.
• Inductively-coupled plasmas in Cl<SUB>2</SUB> and O<SUB>2</SUB>: Comparing HPEM with advanced diagnostic measurements
  
  • Booth Jean-Paul
  • Foucher Mickaël
  • Gibson Andrew
  • Marinov Daniil
  • Sirse Nishant
  • Chabert Pascal
  • Kushner M.J.
  , 2015.
• Prolongation of guided discharge initiated by femtosecond laser filamentation in air from 1-µs scale up to 1-ms
  
  • Arantchouk Léonid
  • Honnorat B.
  • Thouin E.
  • Point G.
  • Carbonnel Jérôme
  • Mysyrowicz André
  • Houard Aurélien
  , 2015.
• Indoor air treatment by plasma-catalyst coupling: fundamentals to process
  
  • Rousseau Antoine
  , 2015.
• 101 uses of Cold Plasmas: from smartphones to space travel
  
  • Booth Jean-Paul
  , 2015.
• Plasmas for Energy and Fusion
  
  • Morel Pierre
  , 2015.
• Electron signatures in asymmetric magnetic reconnection
  
  • Aunai N.
  • Dargent Jérémy
  • Dorville Nicolas
  • Belmont Gérard
  • Lavraud B.
  • Hesse Michael
  • Smets Roch
  , 2015.
• Turbulent energy dissipation in thin reconnecting current sheets
  
  • Retinò Alessandro
  , 2015.
• Developing the Planetary Science Virtual Observatory
  
  • Erard Stéphane
  • Cecconi Baptiste
  • Le Sidaner Pierre
  • Henry Florence
  • Chauvin Cyril
  • Berthier Jerôme
  • André Nicolas
  • Genot Vincent
  • Schmitt Bernard
  • Capria Maria Teresa
  • Chanteur Gérard
  , 2015, 22. In the frame of the Europlanet-RI program, a prototype Virtual Observatory dedicated to Planetary Science has been set up. Most of the activity was dedicated to the definition of standards to handle data in this field. The aim was to facilitate searches in big archives as well as sparse databases, to make on-line data access and visualization possible, and to allow small data providers to make their data available in an interoperable environment with minimum effort. This system makes intensive use of studies and developments led in Astronomy (IVOA), Solar Science (HELIO), and space archive services (IPDA).The current architecture connects existing data services with IVOA or IPDA protocols whenever relevant. However, a more general standard has been devised to handle the specific complexity of Planetary Science, e.g. in terms of measurement types and coordinate frames. This protocol, named EPN-TAP, is based on TAP and includes precise requirements to describe the contents of a data service (Erard et al Astron &amp; Comp 2014). A light framework (DaCHS/GAVO) and a procedure have been identified to install small data services, and several hands-on sessions have been organized already. The data services are declared in standard IVOA registries. Support to new data services in Europe will be provided during the proposed Europlanet H2020 program, with a focus on planetary mission support (Rosetta, Cassini...).A specific client (VESPA) has been developed at VO-Paris (http://vespa.obspm.fr). It is able to use all the mandatory parameters in EPN-TAP, plus extra parameters from individual services. A resolver for target names is also available. Selected data can be sent to VO visualization tools such as TOPCAT or Aladin though the SAMP protocol.Future steps will include the development of a connection between the VO world and GIS tools, and integration of heliophysics, planetary plasma and reference spectroscopic data.The EuroPlaNet-RI project was funded by the European Commission under the 7th Framework Program, grant 228319 &quot;Capacities Specific Programme&quot;.
• Optimum Plasma Grid Bias for a Negative Hydrogen Ion Source Operation with Cs
  
  • Bacal M.
  • Sasao M.
  • Wada M.
  • Mcadams R.
  , 2016, 87 (2), pp.02B132. The functions of a biased plasma grid of a negative hydrogen (H-) ion source for both pure volume and Cs seeded operations are reexamined. Proper control of the plasma grid bias in pure volume sources yields: enhancement of the extracted negative ion current, reduction of the co-extracted electron current, flattening of the spatial distribution of plasma potential across the filter magnetic field, change in recycling from hydrogen atomic/molecular ions to atomic/ molecular neutrals and enhanced concentration of H- ions near the plasma grid. These functions are maintained in the sources seeded with Cs with additional direct emission of negative ions under positive ion and neutral hydrogen bombardment onto the plasma electrode. accepted RSI oct 2015 en attente doi
• Kinetics in atmospheric-pressure discharges in helium mixtures with nitrogen and oxygen
  
  • Viegas Pedro
  • Alves Luís
  • Pechereau François
  • Bourdon Anne
  • Guerra V.
  , 2015. This work studies different elementary processes controlling the global discharge behavior and the kinetics of the main charged and neutral species in helium / nitrogen / oxygen plasmas. Numerical simulations of the electron impact reactions in helium-based plasmas are performed using the IST- LoKI computational tool. The influence of He metastable states and consequent superelastic and stepwise ionization collisions are documented, as well as the influence of the admixture of air gases with different collision cross sections and ionization thresholds. For a relative density of the molecular gas of only 0.1%, the calculated ionization rate coefficient is shown to be higher than in pure He. Particle balance equations have been solved for a reduced He-N2 kinetic scheme, considering the local application of a transitory electric field with 50Td maximum amplitude. The key role of the N2 admixture in He and of various elementary processes, especially Penning reactions, on the ionization degree of the plasma is pointed out.
• Plasma propulsion using novel concepts
  
  • Rafalskyi D.V.
  • Aanesland Ane
  , 2015.
• Vibrational kinetics in Cl<SUB>2</SUB> and O<SUB>2</SUB> low-pressure inductively-coupled plasmas
  
  • Booth Jean-Paul
  • Foucher Mickaël
  • Marinov Daniil
  • Chabert Pascal
  • Annusova Adriana
  • Guerra V.
  , 2015.
• Few questions for the future in plasma physics :exemple of the concept of dose in biomedical application
  
  • Rousseau Antoine
  , 2015.