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Rate of radial transport of plasma in Saturn's inner magnetosphere
Wilson, R. J.; Chen, Y.; Hill, T. W. +1 more
In the inner part of a rapidly rotating magnetosphere such as that of Saturn, the major observable signature of radial plasma convection is a series of longitudinally localized injections and simultaneous drift dispersions of hot tenuous plasma from the outer magnetosphere. The Cassini Plasma Spectrometer (CAPS) and the Cassini Magnetospheric Imag…
Venus night airglow: Ground-based detection of OH, observations of O 2 emissions, and photochemical model
Krasnopolsky, Vladimir A.
Venus nightglow was observed at NASA IRTF using a high-resolution long-slit spectrograph CSHELL at LT = 21:30 and 4:00 on Venus. Variations of the O 2 airglow at 1.27 µm and its rotational temperature are extracted from the observed spectra. The mean O 2 nightglow is 0.57 MR at 21:30 at 35°S-35°N, and the temperature in…
Atomic and Molecular Carbon as a Tracer of Translucent Clouds
Jenkins, Edward B.; France, Kevin; Burgh, Eric B.
Using archival, high-resolution far-ultraviolet Hubble Space Telescope/Space Telescope Imaging Spectrograph spectra of 34 Galactic O and B stars, we measure C I column densities and compare them with measurements from the literature of CO and H2 with regard to understanding the presence of translucent clouds along the line of sight. We …
Wave properties in the magnetic reconnection diffusion region with high β: Application of the k-filtering method to Cluster multispacecraft data
Sahraoui, F.; Deng, X. H.; Wang, J. F. +6 more
Magnetic reconnection is a crucial physical process in laboratory and astrophysical plasmas. Plasma waves are believed to provide the dissipation mechanism in magnetic reconnection. In this paper we analyze the properties of low-frequency waves in a magnetotail reconnection diffusion region with a small guide field and high β. Using the k-filterin…
Realistic model atmosphere and revised abundances of the coolest Ap star HD 101065
Shulyak, D.; Ryabchikova, T.; Kochukhov, O. +1 more
Aims: Among the known Ap stars, HD 101065 is probably one of the most interesting objects, demonstrating very rich spectra of rare-earth elements (REE). Strongly peculiar photometric parameters of this star can not be fully reproduced by any modern theoretical calculations, even those accounting for realistic chemistry of its atmosphere. In t…
Compositional heterogeneity of Asteroid 4 Vesta’s southern hemisphere: Implications for the Dawn mission
Nathues, Andreas; Li, Jian-Yang; Reddy, Vishnu +3 more
High signal-to-noise, rotationally-resolved spectra of Asteroid 4 Vesta's southern hemisphere from the 2007 opposition were used to constrain its compositional and mineralogical variations. The spectra were rotationally-phased using closely timed HST observations of Vesta by Li et al. (Li, J.-Y., McFadden, L.A., Thomas, P.C., Mutchler, M.J., Parke…
M/LB and Color Evolution for a Deep Sample of M sstarf Cluster Galaxies at z ~ 1: The Formation Epoch and the Tilt of the Fundamental Plane
Kelson, D. D.; van der Wel, A.; Illingworth, G. D. +2 more
We have measured velocity dispersions (σ) for a sample of 36 galaxies with J < 21.2 or Mr < -20.6 mag in MS 1054-03, a massive cluster of galaxies at z = 0.83. Our data are of uniformly high quality down to our selection limit, our 16 hr exposures typically yielding errors of only δ(σ) ~ 10% for L* and fainter galaxies. By combini…
Water in massive star-forming regions: HIFI observations of W3 IRS5
de Graauw, Th.; Liseau, R.; Braine, J. +59 more
We present Herschel observations of the water molecule in the massive star-forming region W3 IRS5. The o-H_217O 110-101, p-H_218O 111-000, p-H2O 202-111, p-H2O 111-000, o-H2O 221-212, …
Cosmic-ray Acceleration Efficiency versus Temperature Equilibration: The Case of SNR 0509-67.5
Vink, J.; Kosenko, D.; Helder, E. A.
We study the 0509-67.5 supernova remnant in the Large Magellanic Cloud with the VLT/FORS2 spectrograph. We detect a broad component in the Hα emission with an FWHM of 2680 ± 70 km s-1 and 3900 ± 800 km s-1 for the southwest (SW) and northeast (NE) shocks, respectively. For the SW, the proton temperature appears to be too low …
First results from the Venetia Burney Student Dust Counter on the New Horizons mission
James, David; Horányi, Mihály; Poppe, Andrew +1 more
The Venetia Burney Student Dust Counter (SDC) onboard the New Horizons mission is an impact-based dust detector designed to map the size and spatial variability of the interplanetary dust population throughout the solar system. SDC consists of fourteen permanently polarized polyvinylidene fluoride detectors that register a charge upon impact by hy…