Search Publications
Full lensing analysis of Abell 1703: comparison of independent lens-modelling techniques
Broadhurst, Tom; Zitrin, Adi; Umetsu, Keiichi +10 more
The inner mass profile of the relaxed cluster Abell 1703 is analysed by two very different strong-lensing techniques applied to the deep Advanced Camera for Surveys and the Wide Field Channel 3 imaging. Our parametric method has the accuracy required to reproduce many sets of multiple images, based on the assumption that mass approximately traces …
Dynamics of Vertical Threads and Descending Knots in a Hedgerow Prominence
Chae, Jongchul
The existence and behavior of vertical fine structures of plasma—threads and knots—are a significant observational clue to understanding the magnetic structure and dynamics of quiescent prominences on the quiet Sun. Based on the equation of motion in ideal MHD, we reason that the non-hydrostatic support of plasma against gravity in general require…
Validation of SWMF magnetic field and plasma
Ridley, A. J.; Welling, D. T.
The Space Weather Modeling Framework (SWMF), using the coupled BATSRUS model, the Rice Convection Model, and an ionosphere electrodynamics solver, is used to simulate 10 space weather events. The simulations are completed in near real time using a limited amount of computational resources. Satellite-specific magnetic field, plasma energy-density s…
High-Resolution Helioseismic Imaging of Subsurface Structures and Flows of a Solar Active Region Observed by Hinode
Zhao, Junwei; Kosovichev, Alexander G.; Sekii, Takashi
We analyze a solar active region observed by the Hinode Ca II H line using the time-distance helioseismology technique, and infer wave-speed perturbation structures and flow fields beneath the active region with a high spatial resolution. The general subsurface wave-speed structure is similar to the previous results obtained from Solar and Heliosp…
Detection and measurement of ice grains and gas distribution in the Enceladus plume by Cassini's Ion Neutral Mass Spectrometer
Waite, J. H.; Teolis, B. D.; Magee, B. A. +2 more
We report on the measurements of the Cassini Ion Neutral Mass Spectrometer (INMS) of the density and structure of Enceladus' south polar plume during the E3 and E5 flybys on 12 March and 9 October 2008. Using a Monte Carlo simulation, we analyze the dependence of the INMS gas inlet transmittance on spacecraft pointing and the effect on the measure…
Planetary eclipse mapping of CoRoT-2a. Evolution, differential rotation, and spot migration
Schmitt, J. H. M. M.; Czesla, S.; Wolter, U. +1 more
The lightcurve of CoRoT-2 shows substantial rotational modulation and deformations of the planet's transit profiles caused by starspots. We consistently model the entire lightcurve, including both rotational modulation and transits, stretching over approximately 30 stellar rotations and 79 transits. The spot distribution and its evolution on the n…
A High Spatial Resolution Mid-Infrared Spectroscopic Study of the Nuclei and Star-Forming Regions in Luminous Infrared Galaxies
Colina, Luis; Alonso-Herrero, Almudena; Díaz-Santos, Tanio +5 more
We present a high spatial (diffraction-limited) resolution (∼0.3") mid-infrared (MIR) spectroscopic study of the nuclei and star-forming regions of four local luminous infrared galaxies (LIRGs) using T-ReCS on the Gemini South telescope. We investigate the spatial variations of the features seen in the N-band spectra of LIRGs on scales of ∼100 pc,…
Evolution of Solar Magnetic Field and Associated Multiwavelength Phenomena: Flare Events on 2003 November 20
Kumar, Pankaj; Uddin, Wahab; Manoharan, P. K.
We analyze Hα images, soft X-ray profiles, magnetograms, extreme ultra-violet images and, radio observations of two homologous flare events (M1.4/1N and M9.6/2B) on 2003 November 20 in the active region NOAA 10501 and study properties of reconnection between twisted filament systems, energy release, and associated launch of coronal mass ejections.…
Dawn-dusk oscillation of Saturn's conjugate auroral ovals
Lamy, L.; Nichols, J. D.; Cowley, S. W. H.
We present observations of the oscillation of the dawn-dusk locations of Saturn's northern and southern UV auroral ovals obtained using the Hubble Space Telescope during the 2009 equinoctial campaign. We determine the dawn-dusk locations of the centers of the southern and northern auroral ovals from the mean of the dawnward and duskward extents of…
Oxygen flux in the solar wind: Ulysses observations
Zurbuchen, Thomas H.; von Steiger, Rudolf; McComas, David J.
We use the complete set of Ulysses solar wind data to conduct a comprehensive determination of the oxygen flux in relation to the proton flux in the solar wind during a wide range of solar activity levels. The data cover the heliosphere between 1.3 and 5.4 AU and, due to the unique orbit of Ulysses, all of the heliographic latitudes within ±80°. W…