Search Publications
Simulated measurements of 67P/Churyumov-Gerasimenko dust coma at 3 AU by the Rosetta GIADA instrument using the GIPSI tool
Fulle, M.; Altobelli, N.; Della Corte, V. +7 more
GIADA (Grain Impact Analyzer and Dust Accumulator) is an in situ instrument, on board the Rosetta spacecraft, designed to measure the dynamical properties of the dust grains emitted by the comet 67P/Churiumov-Gerasimenko (hereafter 67P/C-G). It consists of three subsystems able to measure the mass and speed of single dust grain and dust mass flux.…
In-flight calibration of the Hot Ion Analyser on board Cluster
Dandouras, I.; Facskó, G.; Barthe, A. +3 more
The Hot Ion Analyser (HIA), part of the Cluster Ion Spectrometry experiment, has the objective to measure the three-dimensional velocity distributions of ions. Due to a variety of factors (exposure to radiation, detector fatigue and aging, changes in the operating parameters, etc.), the particles' detection efficiency changes over time, prompting …
Megaflood analysis through channel networks of the Athabasca Valles, Mars based on multi-resolution stereo DTMs and 2D hydrodynamic modeling
Kim, Jung-Rack; Schumann, Guy; Neal, Jeffrey C. +1 more
Stereo analysis of in-orbital imagery provides valuable topographic data for scientific research over planetary surfaces especially for the interpretation of potential fluvial activity. The focus of research into planetary fluvial activity has been shifting toward quantitative modeling with various spatial resolution DTMs from visual interpretatio…
Visibility of Type III burst source location as inferred from stereoscopic space observations
Maksimovic, M.; Rucker, H. O.; Boudjada, M. Y. +1 more
We study solar Type III radio bursts simultaneously observed by RPWS/Cassini, URAP/Ulysses and WAVES/Wind experiments. The observations allows us to cover a large frequency bandwidth from 16MHz down to a few kHz. We consider the onset time of each burst, and estimate the corresponding intensity level. Also we measure the Langmuir frequency as obse…
North-South Asymmetry in the Distribution of Solar Background Magnetic Field
Obridko, V. N.; Chertoprud, V. E.; Kuzanyan, K. M.
The aim of this article is to investigate how the background magnetic field of the Sun behaves in different hemispheres. We used SOHO/MDI data obtained during a period of eight years from 2003 to 2011 to analyze the intensity distribution of the background magnetic field over the solar surface. We find that the background fields of both polarities…
A Magnified View of Star Formation at z = 0.9 From Two Lensed Galaxies
Veilleux, Sylvain; Rigby, Jane R.; Swinbank, Mark +1 more
We present new narrowband Hα imaging from the Hubble Space Telescope of two z = 0.91 galaxies that have been lensed by the foreground galaxy cluster A2390. These data probe spatial scales as small as ~0.3 kpc, providing a magnified look at the morphology of star formation at an epoch when the global star formation rate (SFR) was high. However, dus…
Oscillations in solar jets observed with the SOT of Hinode: viscous effects during reconnection
Koutchmy, S.; Tavabi, E.
Transverse oscillatory motions and recurrence behavior in the chromospheric jets observed by Hinode/SOT are studied. A comparison is considered with the behavior that was noticed in coronal X-ray jets observed by Hinode/XRT. A jet like bundle observed at the limb in Ca II H line appears to show a magnetic topology that is similar to X-ray jets (i.…
The Quiescent Counterpart of the Peculiar X-Ray Burster SAX J2224.9+5421
Degenaar, N.; Wijnands, R.; Miller, J. M.
SAX J2224.9+5421 is an extraordinary neutron star low-mass X-ray binary. It was discovered when it was exhibiting a ~= 10 s long thermonuclear X-ray burst, but it had faded to a 0.5-10 keV luminosity of L X <~ 8 × 1032(D/7.1 kpc)2 erg s-1 only ~= 8 hr later. It is generally assumed that neutron stars …
Contrasting electron acceleration processes during two substorms
Schriver, David; El-Alaoui, Mostafa; Walker, Raymond J. +3 more
Although energetic particle injections during substorms have been observed near geosynchronous orbit since the late 1960s, how the injected particles are accelerated during a substorm is still not fully understood. Studies show that injections are associated with earthward propagating dipolarization fronts and suggest that particle acceleration ca…
Simulated (STEREO) Views of the Solar Wind Disturbances Following the Coronal Mass Ejections of 1 August 2010
Feng, X. S.; Zhang, Y.; Dryer, M. +7 more
Images observed by the twin spacecraft Solar TErrestrial RElations Observatory (STEREO) A and B appear as complex structures for two coronal mass ejections (CMEs) on 1 August 2010. Therefore, a series of sky maps of Thomson-scattered white light by interplanetary coronal mass ejections (ICMEs) on 1 August 2010 are simulated using the Hakamada-Akas…