Search Publications
Stability of co-orbital ring material with applications to the Janus-Epimetheus system
Murray, Carl D.; Williams, Gareth A.
An analytical model that describes the evolution of ring particles that are co-orbital with two larger bodies on near-circular and near-planar orbits has been formulated. This can be used to estimate the lifetime of the particles within the ring. All the examples investigated, such as the Janus-Epimetheus (JE) system, indicate that the particles s…
Suzaku Discovery of Twin Thermal Plasma from the Tornado Nebula
Koyama, Katsuji; Sawada, Makoto; Go Tsuru, Takeshi +1 more
The Tornado nebula (G357.7
Observation and theoretical modeling of electron scale solar wind turbulence
Belmont, Gérard; Rezeau, Laurence; Sahraoui, Fouad +4 more
Turbulence at MagnetoHydroDynamics (MHD) scales in the solar wind has been studied for more than three decades, using data analysis, theoretical and numerical modeling. However, smaller scales have not been explored until very recently. Here, we review recent results on the first observation of cascade and dissipation of the solar wind turbulence …
Cassini magnetometer observations over the Enceladus poles
Persoon, A. M.; Russell, C. T.; Wei, H. Y. +5 more
In 2009 and 2010, the Cassini spacecraft made seven targeted Enceladus flybys along trajectories parallel to the equatorial plane. The magnetometer on board Cassini made a complete set of vector field distribution measurements on these tracks and observed significant perturbations that further constrained the location of the momentum-exchange regi…
Geoefficiency of solar wind discontinuities
Palmroth, M.; Pulkkinen, T. I.; Andreeova, K. +1 more
We have investigated the solar wind-magnetosphere coupling efficiency in response to solar wind dynamic pressure enhancements. We investigate fast forward shocks, corotating interaction regions (CIRs), and pressure pulses separately, by conducting a statistical driver-response analysis. We complement the observations by results from the GUMICS-4 g…
Interacting galaxies in deep fields of the Hubble Space Telescope
Reshetnikov, V. P.; Mohamed, Y. H.
The morphologies of galaxies in several deep fields (HDF-N, HDF-S, HUDF, GOODS, GEMS) of the Hubble Space Telescope are analyzed visually. Lists are made of the galaxies with tidal structures (tails, bridges) and type M51 galaxies in these fields. Photometric characteristics and estimated redshifts for most of these objects are found in the publis…
Nonlinear coupling of kinetic Alfvén waves and magnetosonic waves in plasma
Sharma, R. P.; Kumar, Sanjay
This paper presents the model equations governing the nonlinear interaction between kinetic Alfvén waves and magnetosonic waves in plasmas (having β ≫ me/mi). The nonlinear dynamical equation satisfies the modified Zakharov system of equations by taking the nonadiabatic response of the density in the form of a magnetosonic wa…
Time Evolution of the Reverse Shock in SN 1006
Long, Knox S.; Fesen, Robert A.; Winkler, P. Frank +1 more
The Schweizer-Middleditch star, located behind the SN 1006 remnant and near its center in projection, provides the opportunity to study cold, expanding ejecta within the SN 1006 shell through UV absorption. Especially notable is an extremely sharp red edge to the Si II 1260 Å feature, which stems from the fastest moving ejecta on the far side of t…
Observables Indicating Two Major Coronal Mass Ejections During the WHI
Nitta, N. V.
Two of the five fast (v≳900 km s−1) coronal mass ejections (CMEs) between January 2007 and December 2009 were observed during the Whole Heliosphere Interval (WHI: 20 March - 16 April 2008). The main purpose of this article is to discuss possible observational signatures that could have been used to predict these CMEs. During the WHI, th…
A large catalogue of ultraluminous X-ray source candidates in nearby galaxies
Roberts, T. P.; Walton, D. J.; Gladstone, J. C. +1 more
Since their discovery, Ultraluminous X-ray sources (ULXs) have attracted attention due to their combination of extreme luminosities and extra-nuclear locations. However, they are a fairly rare phenomenon, and attempts to investigate the general properties of the population have been hindered by a relative lack of known sources. Here, we present a …