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Orbital detection and implications of akaganéite on Mars
Le Deit, Laetitia; Carter, John; Loizeau, Damien +2 more
The martian surface bears the mineralogical record of ancient sub-surface and surface aqueous alteration environments. While most of the chemical alteration produced phyllosilicates, hydrated sulfates and chlorides, other less common compounds provide key constraints on localized geochemical settings, and help refine the geological evolution of th…
Unambiguous Detection of Reflection in Magnetic Cataclysmic Variables: Joint NuSTAR-XMM-Newton Observations of Three Intermediate Polars
Mukai, K.; de Martino, D.; Bernardini, F. +1 more
In magnetic cataclysmic variables (CVs), X-ray emission regions are located close to the white dwarf surface, which is expected to reflect a significant fraction of intrinsic X-rays above 10 keV, producing a Compton reflection hump. However, up to now, a secure detection of this effect in magnetic CVs has largely proved elusive because of the limi…
Direct Observations of Magnetic Reconnection Outflow and CME Triggering in a Small Erupting Solar Prominence
Reeves, Katharine K.; Tian, Hui; McCauley, Patrick I.
We examine a small prominence eruption that occurred on 2014 May 1 at 01:35 UT and was observed by the Interface Region Imaging Spectrometer (IRIS) and the Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory. Pre- and post-eruption images were taken by the X-ray Telescope (XRT) on Hinode. Pre-eruption, a dome-like structure exists…
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…