Search Publications
Missions
Journals
Publication Years
Hydrogen and methane in Titan's atmosphere: chemistry, diffusion, escape, and the Hunten limiting flux principle (This article is part of a Special Issue that honours the work of Dr. Donald M. Hunten FRSC who passed away in December 2010 after a very illustrious career)
Strobel, Darrell F.
One of Professor Donald M. Hunten's lasting contributions to the field of planetary atmospheres was the principle of the (Hunten) limiting flux, where the escape of light species is limited by the rate at which they can diffuse through the atmosphere. While his limiting flux expression has been well tested for hydrogen's escape from the Earth's at…
Emitted power of Jupiter based on Cassini CIRS and VIMS observations
West, Robert A.; Baines, Kevin H.; Nixon, Conor A. +11 more
The emitted power of Jupiter and its meridional distribution are determined from observations by the Composite Infrared Spectrometer and Visual and Infrared Mapping Spectrometer onboard Cassini during its flyby en route to Saturn in late 2000 and early 2001. Jupiter's global-average emitted power and effective temperature are measured to be 14.10 …
Rapid Transition of Uncombed Penumbrae to Faculae during Large Flares
Liu, Chang; Wang, Haimin; Deng, Na
In the past two decades, the complex nature of sunspots has been disclosed with high-resolution observations. One of the most important findings is the "uncombed" penumbral structure, where a more horizontal magnetic component carrying most of Evershed flows is embedded in a more vertical magnetic background. The penumbral bright grains are locati…
New insights into the star formation histories of candidate intermediate-age early-type galaxies from K'-band imaging of globular clusters
Georgiev, Iskren Y.; Goudfrooij, Paul; Puzia, Thomas H.
We investigate the age and metallicity distributions of bright globular clusters (GCs) in the candidate intermediate-age early-type galaxies NGC 3610, 584 and 3377 using a combination of new Gemini's Near InfraRed Imager and Spectrometer K'-band imaging and existing optical VI photometry from Hubble Space Telescope data. The V-I versus I-K' colour…
The Acceleration Region of Stable Auroral Arcs
Karlsson, T.
Morpho-kinematic Analysis of the Point-symmetric, Bipolar Planetary Nebulae Hb 5 and K 3-17, A Pathway to Poly-polarity
López, J. A.; Steffen, W.; García-Díaz, Ma. T. +2 more
The kinematics of the bipolar planetary nebulae Hb 5 and K 3-17 are investigated in detail by means of a comprehensive set of spatially resolved high spectral resolution, long-slit spectra. Both objects share particularly interesting characteristics, such as a complex filamentary, rosette-type nucleus, axial point-symmetry, and very fast bipolar o…
Dwarf galaxies in the Coma cluster - I. Velocity dispersion measurements
Mobasher, B.; Tully, R. B.; Guzmán, R. +8 more
We present the study of a large sample of early-type dwarf galaxies in the Coma cluster observed with DEIMOS on the Keck II to determine their internal velocity dispersion. We focus on a subsample of 41 member dwarf elliptical galaxies for which the velocity dispersion can be reliably measured, 26 of which were studied for the first time. The magn…
'Distance mapping' and the 3D structure of BD +30° 3639
Akras, S.; Steffen, W.
BD +30° 3639 is a member of a group of uncommon planetary nebulae with Wolf-Rayet central star and higher expansion velocities in [O III] than in [N II] lines. Images and high-resolution spectra from the literature are used in order to construct a 3D model of the nebula using the morpho-kinematic code SHAPE. We find that two homologous expansion l…
X-Ray Spectral Variability in NGC 3783
Fabian, A. C.; Miller, J. M.; Reynolds, C. S. +6 more
NGC 3783 was observed for approximately 210 ks by Suzaku and in this time showed significant spectral and flux variability at both short (20 ks) and long (100 ks) timescales. The full observation is found to consist of approximately six "spectral periods" where the behavior of the soft (0.3-1.0 keV) and hard (2-10 keV) bands are somewhat distinct.…
Seasonal and clock angle control of the location of flux transfer event signatures at the magnetopause
Milan, S. E.; Fear, R. C.; Palmroth, M.
Most models of flux transfer event (FTE) formation produce pairs of structures which in general move away from the subsolar region and give rise to signatures which can be observed in both the Northern and Southern Hemispheres. The multiple reconnection line (X line) model is unusual as a reconnection-based model that is capable of producing a sin…