Search Publications
Whistler Turbulence Wavevector Anisotropies: Particle-in-cell Simulations
Saito, Shinji; Gary, S. Peter; Narita, Yasuhito
Two-dimensional electromagnetic particle-in-cell simulations of whistler turbulence in a magnetized, homogeneous, collisionless plasma of electrons and protons are carried out. Enhanced magnetic fluctuation spectra are initially imposed at relatively long wavelengths, and, as in previous such simulations, the temporal evolution shows a forward cas…
Microlensing in H1413+117: disentangling line profile emission and absorption in a broad absorption line quasar
Riaud, P.; Sluse, D.; Anguita, T. +2 more
On the basis of 16 years of spectroscopic observations of the four components of the gravitationally lensed broad absorption line (BAL) quasar H1413+117, covering the ultraviolet to visible rest-frame spectral range, we analyze the spectral differences observed in the P Cygni-type line profiles and have used the microlensing effect to derive new c…
Keck/LRIS Spectroscopic Confirmation of Coma Cluster Dwarf Galaxy Membership Assignments
Ferguson, Henry C.; Marzke, Ronald O.; Chiboucas, Kristin +5 more
Keck/LRIS multi-object spectroscopy has been carried out on 140 of some of the lowest and highest surface brightness faint (19 < R < 22) dwarf galaxy candidates in the core region of the Coma Cluster. These spectra are used to measure redshifts and establish membership for these faint dwarf populations. The primary goal of the low surface br…
AKARI's infrared view on nearby stars. Using AKARI infrared camera all-sky survey, 2MASS, and Hipparcos catalogs
Matsunaga, N.; Matsuhara, H.; Oyabu, S. +11 more
Context. The AKARI, a Japanese infrared space mission, has performed an All-Sky Survey in six infrared-bands from 9 to 180 µm with higher spatial resolutions and better sensitivities than IRAS.
Aims: We investigate the mid-infrared (9 and 18 µm) point source catalog (PSC) obtained with the infrared camera (IRC) onboard AKARI, in o…
Electron beams as the source of whistler-mode auroral hiss at Saturn
Schippers, P.; André, N.; Gurnett, D. A. +8 more
Over the last three years, the Cassini spacecraft has been in a series of high inclination orbits, allowing investigation and measurements of Saturnian auroral phenomena. During this time, the Radio and Plasma Wave Science (RPWS) Investigation on Cassini detected low frequency whistler mode emissions propagating upward along the auroral field line…
Auroral signatures of flow bursts released during magnetotail reconnection at Jupiter
Bonfond, B.; Gérard, J. -C.; Grodent, D. +1 more
Recent studies based on Hubble Space Telescope (HST) data reported the presence of transient polar dawn spots in the Jovian auroral region and interpreted them as signatures of internally driven magnetic reconnection in the Jovian magnetotail. Even though an association of the polar dawn spots with the reconnection process has been suggested, it h…
Determining the extragalactic extinction law with SALT - II. Additional sample
O'Donoghue, Darragh; Buckley, David A. H.; Sefako, Ramotholo +8 more
We present new results from an ongoing programme to study the dust extragalactic extinction law in E/S0 galaxies with dust lanes with the Southern African Large Telescope (SALT) during its performance verification phase. The wavelength dependence of the dust extinction for seven galaxies is derived in six spectral bands ranging from the near-ultra…
The Diagnostics of the κ-Distributions from EUV Spectra
Dzifčáková, E.; Kulinová, A.
The EUV lines suitable to diagnose possible κ-distributions in the solar corona are examined. A set of synthetic spectra for various values of the κ-parameter, characterizing the non-thermal κ-distributions, electron densities, and the mean energy of the distributions are calculated in the spectral range corresponding to the Hinode/EIS and Coronas…
Radiative transfer in the atmosphere of Venus and application to surface emissivity retrieval from VIRTIS/VEX measurements
Haus, Rainer; Arnold, Gabriele
The radiation measurements of VIRTIS-M-IR (1-5 µm) on Venus Express provide a valuable database for systematic studies of the atmosphere and surface of the Earth's sister planet. The present paper focuses on the investigation of physical parameters that determine the retrieval accuracy of deep atmosphere and surface features of Venus includi…
Composition, Structure, Dynamics, and Evolution of Saturn's Rings
Esposito, Larry W.
Cassini observations confirm that Saturn's rings are predominantly water ice. The particles in Saturn's rings cover a range of sizes, from dust to small moons. Occultation results show the particles form temporary elongated aggregates tens of meters across. Some of the ring structure is created by moons, others by various instabilities. Data from …