Search Publications
Reinterpretation of Slowdown of Solar Wind Mean Velocity in Nonlinear Structures Observed Upstream of Earth's Bow Shock
Liu, Y.; Dandouras, I.; Rème, H. +10 more
Two of the many features associated with nonlinear upstream structures are (1) the solar wind (SW) mean flow slows down and deviates substantially and (2) the temperature of the plasma increases in the structure. In this Letter, we show that the SW beam can be present throughout the entire upstream event maintaining a nearly constant beam velocity…
Spectroscopy of diffuse light in dust clouds. Scattered light and the solar neighbourhood radiation field
Lehtinen, K.; Mattila, K.
Context. The optical surface brightness of dark nebulae is mainly due to scattering of integrated starlight by classical dust grains. It contains information on the impinging interstellar radiation field, cloud structure, and grain scattering properties. We have obtained spectra of the scattered light from 3500 to 9000 Å in two globules, the Thumb…
Supernova remnant G296.7-0.9 in X-rays
Becker, W.; Prinz, T.
Aims: We present a detailed study of the supernova remnant G296.7-0.9 in the 0.2-12 keV X-ray band.
Methods: Using data from XMM-Newton, we performed a spectro-imaging analysis of G296.7-0.9 in order to deduce the basic parameters of the remnant and search for evidence of a young neutron star associated with it.
Results: In X-rays t…
The dark side of Saturn’s B ring: Seasons as clues to its structure
Ferrari, C.; Reffet, E.
The unlit side of the dense B ring of Saturn does not receive direct sunlight. Yet it cools down as the Sun sets on the ring from solstice to equinox. A multi-scale thermal model that treats the heat transfer through a packed ensemble of particles is built to study the orbital and seasonal temperature variations of both lit and unlit sides of this…
He2+ transport in the Martian upper atmosphere with an induced magnetic field
Barabash, S.; Stenberg, G.; Shematovich, V. I. +3 more
wind helium may be a significant source of neutral helium in the Martian atmosphere. The precipitating particles also transfer mass, energy, and momentum. To investigate the transport of He2+ in the upper atmosphere of Mars, we have applied the direct simulation Monte Carlo method to solve the kinetic equation. We calculate the upward H…
Morphology and geology of an interior layered deposit in the western Tithonium Chasma, Mars
Baioni, Davide
This paper describes a morphologic and morphometric survey of a 3.1 km-high, domeshaped upland in western Tithonium Chasma (TC) which coincides with areas containing abundant surface signatures of the sulphate mineral kiersite, as identified by the OMEGA image spectrometer. The morphologic features of the dome were investigated through an integrat…
Solar Occultation by Titan Measured by Cassini/UVIS
Koskinen, Tommi T.; Yelle, Roger V.; McClintock, William E. +4 more
We present the first published analysis of a solar occultation by Titan's atmosphere measured by the Ultraviolet Imaging Spectrograph on board Cassini. The data were measured during flyby T53 in 2009 April and correspond to latitudes between 21° and 28° south. The analysis utilizes the absorption of two solar emission lines (584 Å and 630 Å) in th…
Frequency drift of Saturn chorus emission compared to nonlinear theory
Gurnett, D. A.; Hospodarsky, G. B.; Menietti, J. D. +1 more
The fine structure of nonlinear drifting-frequency chorus is observed at Saturn by the Cassini Radio and Plasma Wave Investigation. During a high-inclination orbit in which Cassini is at near-constant L-shell within about 10° of the magnetic equator, moderately intense nonlinear chorus is observed. Cassini observed a region of intense chorus and l…
The 54-day orbital period of AX J1820.5-1434 unveiled by Swift
Campana, S.; Cusumano, G.; Masetti, N. +3 more
Context. The hard X-ray survey that Swift Burst Alert Telescope (BAT) has been performing since late 2004 provides a considerable database for a large number of sources, whose hard X-ray emission are poorly known.
Aims: We exploit the BAT survey archive to improve the temporal and spectral characterization of the Galactic hard-X-ray sources. …
Multi-band constraints on the nature of emission line galaxies
Capetti, A.; Balmaverde, B.
Our aim is to explore the nature of emission line galaxies by combining high-resolution observations obtained in different bands to understand which objects are powered by an active galactic nucleus (AGN). From the spectroscopic Palomar survey of nearby bright galaxies, we selected a sample of 18 objects observed with Hubble Space Telescope (HST),…