Search Publications
Cavities of weak magnetic field strength in the wake of FTEs: Results from global magnetospheric MHD simulations
Toth, G.; Hesse, M.; Wang, Y. +4 more
We use the global magnetohydrodynamic (MHD) code BATS-R-US to model multipoint observations of Flux Transfer Event (FTE) signatures. Simulations with high spatial and temporal resolution predict that cavities of weak magnetic field strength protruding into the magnetosphere trail FTEs. These predictions are consistent with recently reported multi-…
Deformation and evolution of solar wind discontinuities through their interactions with the Earth's bow shock
Dandouras, I.; Nakamura, R.; Lucek, E. A. +13 more
The present study examines the interaction of solar wind discontinuities with the Earth's bow shock, using multipoint observations in the magnetosheath by Time History of Events and Macroscale Interactions During Substorms (THEMIS), Cluster, and Double Star TC1. We focus on the deformation and evolution of two discontinuities observed on 21 June 2…
Short-Term Variability and Power Spectral Density Analysis of the Radio-Loud Active Galactic Nucleus 3C 390.3
Eracleous, Michael; Reeves, James N.; Gliozzi, Mario +4 more
We investigate the short-term variability properties and the power spectral density (PSD) of the broad-line radio galaxy (BLRG) 3C 390.3 using observations made by XMM-Newton, RXTE, and Suzaku on several occasions between 2004 October and 2006 December. The main aim of this work is to derive model-independent constraints on the origin of the X-ray…
Energetic neutral atom (ENA) and charged particle periodicities in Saturn’s magnetosphere
Paranicas, C.; Krimigis, Stamatios M.; Mitchell, Donald G. +2 more
The Magnetospheric Imaging Instrument (MIMI) on the Cassini spacecraft has observed energetic neutral atoms (ENA) and charged particles at Saturn from mid-2004 to the present. The particles often but not always reveal striking periodic behavior that seems to depend on the type of particle and spacecraft location. When subjected to a Lomb periodogr…
Multiwavelength analysis of a solar quiet region
Heinzel, P.; Schwartz, P.; Tziotziou, K. +1 more
Context: We examine oscillatory phenomena in a solar network region from multi-wavelength observations obtained by the ground-based Dutch Open Telescope (DOT) and by the Coronal Diagnostic Spectrometer (CDS) on the spacecraft Solar and Heliospheric Observatory (SoHO). The observations were obtained during a coordinated observing campaign in Octobe…
The nuclei of Jupiter family comets: A critical review of our present knowledge
Thomas, Nicolas
Of the currently over 300 identified Jupiter family comets (JFCs), we have estimated nucleus sizes and shapes for fewer than 70 and have detailed nucleus observations arising from spacecraft fly-bys for just 3: 19P/Borrelly (Deep Space 1), 81P/Wild 2 (Stardust), and 9P/Tempel 1 (Deep Impact). These observations reveal similarities but also signifi…
Using the reduced proper motions of Tycho-2 stars with B-V from 0.75 to 1.25: Monte Carlo simulations
Gontcharov, G. A.
The stellar composition of the Tycho-2 Catalogue in the range B-V = 0{·/ m }75-1{·/ m }25 has been reproduced through Monte Carlo simulations. For young and old stars of the red giant clump (RGC), the red giant branch, subgiants, red dwarfs, and thick-disk giants, we have specified the distributions in c…
Mass Composition in Pre-eruption Quiet Sun Filaments
Alexander, David; Kilper, Gary; Gilbert, Holly
Filament eruptions are extremely important phenomena due to their association with coronal mass ejections and their effects on space weather. Little is known about the filament mass and composition in the eruption process, since most of the related research has concentrated on the evolution and disruption of the magnetic field. Following up on our…
Three New Galactic Double-mode Pulsating Stars
Hajdu, G.; Jurcsik, J.; Sodor, A.
Double-mode nature of three pulsating variables are revealed.
Observational Evidence for Coronal Twisted Flux Rope
Raouafi, N. -E.
Multi-instrument data sets of NOAA AR10938 on 2007 January 16 (e.g., Hinode, STEREO, GOES, MLSO, and ISOON Hα) are utilized to study the fine structure and evolution of a magnetic loop system exhibiting multiple crossing threads, whose arrangement and individual shapes are very suggestive of individual field lines in a flux rope. The footpoints of…