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The Field of Shock-Generated Alfven Oscillations Near the Plasmapause
Zong, Q. -G.; Leonovich, A. S.; Kozlov, D. A. +1 more
A theoretical interpretation is given for magnetohydrodynamic (MHD) oscillations observed by the GOES and Cluster satellites on November 7, 2004 near the plasmapause (Zong et al., 2009, 2012, https://doi.org/10.1029/2009ja014393, https://doi.org/10.10…
Shape, colour, and distance in weak gravitational flexion
Goldberg, David M.; Fabritius, Joseph M., II; Arena, Evan J.
Canonically, elliptical galaxies might be expected to have a perfect rotational symmetry, making them ideal targets for flexion studies - however, this assumption has not been tested. We have undertaken an analysis of low- and high-redshift galaxy catalogues of known morphological type with a new gravitational lensing code, Lenser. Using colour me…
New constraints on the chemical composition and outgassing of 67P/Churyumov-Gerasimenko
Thomas, N.; Rubin, M.; Mousis, O. +4 more
Strong heterogeneities in the composition of the volatile species have been detected in the coma of comet 67P/Churyumov-Gerasimenko (67P/C-G) by the ROSINA instrument onboard the ESA's Rosetta spacecraft. However, it is not clear if these heterogeneities are indicative of heterogeneities in the near-surface nucleus composition or if the coma compo…
Compact planetary nebulae MaC 2-1 and Sp 4-1: photoionization models and dust characteristics
Mondal, Soumen; Das, Ramkrishna; Bandyopadhyay, Rahul
We study the characteristics of the planetary nebulae (PNe) MaC 2-1 and Sp 4-1. We use our optical spectra taken with the 2 m Himalayan Chandra Telescope, Spitzer mid-infrared (mid-IR) spectra, HST images, and IR photometric data. These PNe have not previously been individually studied in detail. Both are in the low- to moderate-excitation class. …
Asymmetrical meridional expansion of bright clouds from Saturn's 2010 great white storm
Dowling, Timothy E.; Li, Liming; Creecy, Ellen C. +4 more
Saturn's recurring great white storms play an important role in modifying its atmosphere. In 2010, such a storm with clouds encircling the planet occurred in the northern hemisphere. An interesting phenomenon of this storm is that the associated bright clouds expanded asymmetrically with respect to latitude, such that the southern boundary of the …
A Multi-wavelength Analysis of Small-scale Brightenings Observed by IRIS
Morgan, Huw; Humphries, Llŷr Dafydd
Small-scale brightenings in solar atmospheric observations are a manifestation of heating and/or energy transport events. We present statistical characteristics of brightenings from a new detection method applied to 1330, 1400, and 2796 Å IRIS slit-jaw image time series. A total of 2377 events were recorded that coexist in all three channels, givi…
Elimination of a virtual impactor of 2006 QV89 via deep non-detection
Faggioli, L.; Micheli, M.; Hainaut, O. R. +3 more
Context. As a consequence of the large (and growing) number of near-Earth objects discovered, some are lost before their orbits can be firmly established and long-term recovery ensured. A fraction of these objects present non-negligible chances of impact with the Earth. We present a method of targeted observations that allow us to eliminate that r…
Heavy Metal and Rock in Space: Cluster RAPID Observations of Fe and Si
Daly, Patrick W.; Haaland, Stein; Vilenius, Esa
Metallic and silicate ions carry essential information about the evolution of the Earth and near Earth small bodies. Despite this, there has so far been very little focus on ions with atomic masses higher than oxygen in the terrestrial magnetosphere. In this paper, we report on abundances and properties of energetic ions with masses corresponding …
Simulating infrared spectro-photometric surveys with a SPRITZ
Pozzi, F.; Rodighiero, G.; Schaerer, D. +19 more
Mid- and far-infrared (IR) photometric and spectroscopic observations are fundamental to a full understanding of the dust-obscured Universe and the evolution of both star formation and black hole accretion in galaxies. In this work, using the specifications of the SPace Infrared telescope for Cosmology and Astrophysics (SPICA) as a baseline, we in…
Studying the interstellar medium to look for relics of triggered star formation among stellar clusters
Granada, A.; Paron, S.; Areal, M. B.
Evidence of triggered star formation at large spatial scales involving stellar clusters is scarce. We investigate a Galactic region (l = 130${_{.}^{\circ}}$0, b = 0${_{.}^{\circ}}$35) populated by several open stellar clusters that according to the last Gaia data release, are located at a distance of about 2.9 kpc. By analysing the interstellar me…