Search Publications
Cluster and ACE observations of phase synchronization in intermittent magnetic field turbulence: a comparative study of shocked and unshocked solar wind
Chian, A. C. -L.; Miranda, R. A.
We apply two distinct nonlinear techniques, kurtosis and phase coherence index, to analyze the modulus of interplanetary magnetic field data |B| measured by Cluster and ACE spacecraft from 1 to 3 February 2002. High degree of phase synchronization is found across a wide range of time scales, from 1 s to 104 s, in the magnetic field fluc…
No sodium in the vapour plumes of Enceladus
Johnson, Robert E.; Dougherty, Michele K.; Schneider, Nicholas M. +5 more
The discovery of water vapour and ice particles erupting from Saturn's moon Enceladus fuelled speculation that an internal ocean was the source. Alternatively, the source might be ice warmed, melted or crushed by tectonic motions. Sodium chloride (that is, salt) is expected to be present in a long-lived ocean in contact with a rocky core. Here we …
Energetic Particle Observations and Propagation in the Three-dimensional Heliosphere During the 2006 December Events
Lario, D.; Forsyth, R. J.; Cohen, C. M. S. +9 more
We report observations of solar energetic particles obtained by the HI-SCALE and COSPIN/LET instruments onboard Ulysses during the period of isolated but intense solar activity in 2006 December, in the declining phase of the solar activity cycle. We present measurements of particle intensities and also discuss observations of particle anisotropies…
Deployment Analysis of Lenticular Jointed Antennas Onboard the Mars Express Spacecraft
Adams, Douglas S.; Mobrem, Mehran
Quiet but still bright: XMM-Newton observations of the soft gamma-ray repeater SGR0526-66
Tiengo, A.; Götz, D.; Mereghetti, S. +7 more
SGR0526-66 was the first soft gamma-ray repeater from which a giant flare was detected in 1979 March, suggesting the existence of magnetars, i.e. neutron stars powered by the decay of their extremely strong magnetic field. Since then, very little information has been obtained on this object, mainly because it has been burst inactive since 1983 and…
The Motion of Water Masers in the Pre-Planetary Nebula IRAS 16342-3814
Sahai, R.; Morris, M. R.; Claussen, M. J.
We present high angular resolution observations, using the Very Long Baseline Array of the NRAO4The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc., of the high-velocity water masers toward the "water fountain" pre-planetary nebul…
Origin and Evolution of Saturn's Ring System
Dones, Luke; Hedman, Matthew M.; Esposito, Larry W. +2 more
The origin and long-term evolution of Saturn's rings is still an unsolved problem in modern planetary science. In this chapter we review the current state of our knowledge on this long-standing question for the main rings (A, Cassini Division, B, C), the F Ring, and the diffuse rings (E and G). During the Voyager era, models of evolutionary proces…
ACRIM-gap and total solar irradiance revisited: Is there a secular trend between 1986 and 1996?
Solanki, S. K.; Krivova, N. A.; Wenzler, T.
A gap in the total solar irradiance (TSI) measurements between ACRIM-1 and ACRIM-2 led to the ongoing debate on the presence or not of a secular trend between the minima preceding cycles 22 (in 1986) and 23 (1996). It was recently proposed to use the SATIRE model of solar irradiance variations to bridge this gap. When doing this, it is important t…
Coronal Implosion and Particle Acceleration in the Wake of a Filament Eruption
Wang, Haimin; Liu, Rui
We study the evolution of a group of TRACE 195 Å coronal loops overlying a reverse S-shaped filament on 2001 June 15. These loops were initially pushed upward with the filament ascending and kinking slowly, but as soon as the filament rose explosively, they began to contract at a speed of ~100 km s-1, and sustained for at least 12 minut…
The diverse nature of optical emission lines in brightest cluster galaxies: IFU observations of the central kiloparsec
Robert, Carmelle; McGee, Sean L.; Edwards, Louise O. V. +1 more
We present integral field spectroscopy of the nebular line emission in a sample of nine brightest cluster galaxies (BCGs). The sample was chosen to probe both cooling flow and non-cooling flow clusters, as well as a range of cluster X-ray luminosities. The line emission morphology and velocity gradients suggest a great diversity in the properties …