Search Publications
Optical properties of aerosols in Titan’s atmosphere: Large fluffy aggregates
Keller, H. U.; Rodin, A. V.; Skorov, Yu. V.
Scattering properties of large ( N>2000) aggregates of monomers as found in Titan's atmosphere during the descent of the Cassini/Huygens probe are numerically calculated. We extend our previous quantitative analysis of small aggregates ( N≤256) to verify the obtained conclusions. To calculate the light scattering of such big non-spherical aggre…
Hubble Space Telescope Near-infrared Snapshot Survey of 3CR Radio Source Counterparts. III. Radio Galaxies and Quasars in Context
O'Dea, Christopher P.; Baum, Stefi; Chiaberge, Marco +6 more
We compare the near-infrared (NIR) H-band photometric and morphological properties of low-z (z < 0.3) 3CR radio galaxies with samples of BL Lac objects and quasar host galaxies, merger remnants, quiescent elliptical galaxies, and brightest cluster galaxies drawn from the literature. In general, the 3CR host galaxies are consistent with luminous…
Quasi-thermal noise spectroscopy: preliminary comparison between kappa and sum of two Maxwellian distributions
Issautier, K.; Zouganelis, I.; Moncuquet, M. +3 more
Quasi-thermal noise spectroscopy has been intensively used to measure in situ the solar wind electron density and core temperature in space with various spacecraft. This method allowed study of the large-scale properties of the solar wind. This paper reminds theoretical tools to compute the quasi-thermal noise spectroscopy using a superposition of…
BRIEF COMMUNICATION: Electron acceleration by whistler-mode waves around the magnetic null during 3D reconnection
Zong, Qiugang; He, Jiansen; Su, Zhenpeng +5 more
The magnetic field configuration around a magnetic null pair and its associated electron behavior during 3D magnetic reconnection have recently been reported from in situ observations. Electrons are suggested to be temporarily trapped in the central reconnection region as indicated by an electron density peak observed near the magnetic null (He J-…
Features of electron current layers: Comparison between three-dimensional particle-in-cell simulations and Cluster observations
Singh, Nagendra; Yeladandi, Manish; Somarothu, Trinath +1 more
Wygant et al. (2005) and more recently Chen et al. (2008) reported Cluster observations on some basic features of electron current layers (ECL) in the magnetotail. These features include (1) a bifurcated ECL consisting of two layers with relatively large currents separated by a region of small current, (2) peaked density at the ECL center bordered…
Infrared identification of 4U1323-619 revisited
Zolotukhin, Ivan Yu.; Revnivtsev, Mikhail G.; Shakura, Nikolai I.
We re-examine the infrared counterpart of the dipping low-mass X-ray binary 4U1323-619. New X-ray data available from the XMM and Chandra observatories combined with archival infrared observations from the European Southern Observatory 3.6-m New Technology Telescope allow us to define a new possible counterpart. We present here its photometric pro…
Evidence for surface variegation in Rosetta OSIRIS images of asteroid 2867 Šteins
Sierks, H.; Keller, H. U.; Hviid, S. F. +4 more
The OSIRIS camera onboard Rosetta successfully acquired images of asteroid 2867 Steins through a variety of color filters during the flyby on 5 September 2008. The best images of this 5 km diameter asteroid have a resolution of 78 m per pixel. We process the images by deconvolving with the point spread function and enlarging through the Mitchell-N…
Properties of dust in the high-latitude translucent cloud L1780. II. 3D radiative transfer modelling
Juvela, M.; Ridderstad, M.
Context. Lynds 1780 is a high-latitude cloud where, based on 2MASS, the maximum visual extinction is AVmax = 4 mag at a resolution of 3'. In LDN1780, increased far-infrared (FIR) emissivity of dust grains has been observed, and the infrared emission is found to peak at different locations at different wavelengths.
Aims: …
First measurements of electron vorticity in the foreshock and solar wind
Fazakerley, A. N.; Gurgiolo, C.; Goldstein, M. L. +1 more
We describe the methodology used to set up and compute spatial derivatives of the electron moments using data acquired by the Plasma Electron And Current Experiment (PEACE) from the four Cluster spacecraft. The results are used to investigate electron vorticity in the foreshock. We find that much of the measured vorticity, under nominal conditions…
A Model for the Stray-Light Contamination of the UVCS Instrument on SOHO
Cranmer, S. R.; Kohl, J. L.; Gardner, L. D.
We present a detailed model of stray-light suppression in the spectrometer channels of the Ultraviolet Coronagraph Spectrometer (UVCS) on the SOHO spacecraft. The control of diffracted and scattered stray light from the bright solar disk is one of the most important tasks of a coronagraph. We compute the fractions of light that diffract past the U…