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What Controls the Structure and Dynamics of Earth's Magnetosphere?
Eastwood, J. P.; Fujimoto, M.; Toth, G. +2 more
Unlike most cosmic plasma structures, planetary magnetospheres can be extensively studied in situ. In particular, studies of the Earth's magnetosphere over the past few decades have resulted in a relatively good experimental understanding of both its basic structural properties and its response to changes in the impinging solar wind. In this artic…
Sulfur in the early martian atmosphere revisited: Experiments with a 3-D Global Climate Model
Forget, François; Kerber, Laura; Wordsworth, Robin
Volcanic SO2 in the martian atmosphere has been invoked as a way to create a sustained or transient greenhouse during early martian history. Many modeling studies have been performed to test the feasibility of this hypothesis, resulting in a range of conclusions, from highly feasible to highly improbable. In this study we perform a wide…
Improved Helioseismic Analysis of Medium-ℓ Data from the Michelson Doppler Imager
Schou, Jesper; Larson, Timothy P.
We present a comprehensive study of one method for measuring various parameters of global modes of oscillation of the Sun. Using velocity data taken by the Michelson Doppler Imager (MDI), we analyze spherical harmonic degrees ℓ ≤300 . Both current and historical methodologies are explained, and the various differences between the two are investiga…
ROSINA/DFMS and IES observations of 67P: Ion-neutral chemistry in the coma of a weakly outgassing comet
Gunell, H.; Wurz, P.; Altwegg, K. +32 more
Context. The Rosetta encounter with comet 67P/Churyumov-Gerasimenko provides a unique opportunity for an in situ, up-close investigation of ion-neutral chemistry in the coma of a weakly outgassing comet far from the Sun.
Aims: Observations of primary and secondary ions and modeling are used to investigate the role of ion-neutral chemistry wit…
Present-day seasonal gully activity in a south polar pit (Sisyphi Cavi) on Mars
Hiesinger, H.; Vincendon, M.; Ruesch, O. +3 more
The large amount of multi-temporal high-resolution images acquired in the last few years offers the opportunity to identify morphological changes associated with recent geologic activity on the surface of Mars. In this study we focus on a single gully in Sisyphi Cavi, located in the south polar region at 1.44°E and 68.54°S. The gully incises the g…
Do current data prefer a nonminimally coupled inflaton?
Mena, Olga; Boubekeur, Lotfi; Ramírez, Héctor +1 more
We examine the impact of a nonminimal coupling of the inflaton to the Ricci scalar, 1/2 ξ R ϕ2, on the inflationary predictions. Such a nonminimal coupling is expected to be present in the inflaton Lagrangian on fairly general grounds. As a case study, we focus on the simplest inflationary model governed by the potential V ∝ϕ2
Calibrating UV Star Formation Rates for Dwarf Galaxies from STARBIRDS
McQuinn, Kristen B. W.; Dolphin, Andrew E.; Skillman, Evan D. +1 more
Integrating our knowledge of star formation (SF) traced by observations at different wavelengths is essential for correctly interpreting and comparing SF activity in a variety of systems and environments. This study compares extinction corrected integrated ultraviolet (UV) emission from resolved galaxies with color-magnitude diagram (CMD) based st…
Comet C/2012 S1 (ISON) coma composition at ~4 au from HST observations
Mutchler, Max; Muinonen, Karri; Hines, Dean C. +10 more
We analyze the first color and polarization images of Comet ISON (C/2012 S1) taken during two measurement campaigns of the Hubble Space Telescope (HST) on UTC 2013 April 10 and May 8, when the phase angles of Comet ISON were α≈13.7° and 12.2°, respectively. We model the particles in the coma using highly irregular agglomerated debris particles. Ev…
UNIMAP: a generalized least-squares map maker for Herschel data
Elia, Davide; Molinari, Sergio; Pezzuto, Stefano +5 more
The Herschel space telescope hosts two infrared photometers having an unprecedented resolution, sensitivity and dynamic range. The map making, i.e. the formation of sky images from the instruments' data, is critical for the full exploitation of the satellite and is a difficult task, since the readouts are affected by several disturbances, most not…
Atomic Data and Spectral Model for Fe II
Kallman, Timothy R.; Bautista, Manuel A.; Mendoza, Claudio +4 more
We present extensive calculations of radiative transition rates and electron impact collision strengths for Fe ii. The data sets involve 52 levels from the 3d7, 3d64s, and 3{d}54{s}2 configurations. Computations of A-values are carried out with a combination of state-of-the-art multiconfiguration approac…