Search Publications
Structures of magnetic null points in reconnection diffusion region: Cluster observations
Baumjohann, W.; Carr, C. M.; Zhang, Hui +10 more
Magnetic reconnection is a very important and fundamental plasma process in transferring energy from magnetic field into plasma. Previous theory, numerical simulations and observations mostly concentrate on 2-dimensional (2D) model; however, magnetic reconnection is a 3-dimensional (3D) nonlinear process in nature. The properties of reconnection i…
A case study of dayside reconnection under extremely low solar wind density conditions
Dandouras, I.; Rème, H.; Maggiolo, R. +2 more
From 15 February 2004, 20:00 UT to 18 February 2004, 01:00 UT, the solar wind density dropped to extremely low values (about 0.35 cm-3). On 17 February, between 17:45 UT and 18:10 UT, the CLUSTER spacecraft cross the dayside magnetopause several times at a large radial distance of about 16 RE. During each of these crossings, …
Constraining the neutron star equation of state using XMM-Newton
Kaastra, J.; Méndez, M.; Jonker, P. G. +1 more
We have identified three possible ways in which future XMM-Newton, observations can provide significant constraints on the equation of state of neutron stars. First, using a long observation of the neutron star X-ray transient Cen X-4 in quiescence one can use the RGS spectrum to constrain the interstellar extinction to the source. This removes th…
Study of the QSO HE0354-5500 with combined HST imaging and VLT spectroscopy . An example of a deconvolution-based method for probing the QSOs host galaxies characteristics
Magain, P.; Courbin, F.; Hutsemékers, D. +2 more
The host galaxy of the QSO HE0354-5500 (M_B=-24.7, z=0.2674) is studied on the basis of high resolution HST optical images and spatially resolved VLT slit spectra. The morphology and dynamics of the host are described. The gas ionization and velocity are mapped as a function of the distance to the central QSO. Reflection or scattering of the QSO H…
Simultaneous Cluster and CUTLASS Observations of FTEs on 11 February 2004
Lester, M.; Dunlop, M. W.; Bogdanova, Y. V. +5 more
This paper analyzes the simultaneous observations of the Flux Gate Magnetometer (FGM) and Plasma Electron and Current Experiment (PEACE) on Cluster Spacecraft, and the CUTLASS Finland radar between 11:00 and 11:40 UT on 11 February 2004. In this interval, the Cluster spacecraft array encountered the northern hemisphere high altitude cusp, and cros…
Catalog of stars with the big proper motion
Ivanov, G. A.
The catalogue (astrometric and astrophysical parameters) of 555200 stars with high proper motions (more than 0.04″/year) was compiled on the basis of original definitions from the catalogues FONAK1.1, Hipparcos, Tycho-2, UCAC2, CMC (STAR 11), PPM, NPM1, NPM2, XZ80Q, Pul-3, Pul2, NLTT, GCVS, LHS, Lowell Proper Motion Service, and Bruce Proper Motio…
Environmental effects on the globular cluster blue straggler population: a statistical approach .
Moretti, A.; De Angeli, F.; Piotto, G.
Blue stragglers stars (BSS) constitute nowadays an ubiquitous population of objects whose origin involves both dynamical and stellar evolution. In this work we analyze the properties of a catalogue of BSS extracted from an homogeneous sample of 56 Galactic globular clusters observed with WFPC2/HST and described in \citet{pio02}. The goal of this s…
Dust envelopes of two S-type AGB stars
Yang, Xiaohong
The ISO-SWS01 spectra of two S stars, IRAS 15492+4837 and IRAS19486+3247, have been investigated with the radiative transfer code DUSTY. For the two stars, the mass-loss rates determined from DUSTY are smaller than the values derived from CO emission, which might indicate that the mass-loss rates of the two stars was higher in the past. The ∼10 &m…
Electron anisotropies in the inner heliosphere
Ferreira, S. E. S.; Potgieter, M. S.; Nkosi, G. S.
The COSPIN/KET experiment on board the Ulysses spacecraft has been observing the flux of 3-30 MeV and also higher energy electrons in the inner heliosphere (radial distances > 5.2 AU) since its launch in 1990. These observations have indicated the presence of low-energy electrons with a strong anisotropy off the equatorial plane as far as 2.2 A…
Testing the local spacetime dynamics by heliospheric radiocommunication methods
Siewert, M.; Fahr, H. -J.
According to general relativistic theories, cosmological spacetime is dynamic. This prediction is in excellent agreement with the huge majority of astronomical observations on large cosmic scales, especially the observations of cosmological redshifts of distant galaxies. However, on scales of heliospheric distances, verifications of general relati…