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A Data-driven Analytic Model for Proton Acceleration by Large-scale Solar Coronal Shocks
Schwadron, Nathan A.; Kozarev, Kamen A.
We have recently studied the development of an eruptive filament-driven, large-scale off-limb coronal bright front (OCBF) in the low solar corona, using remote observations from the Solar Dynamics Observatory’s Advanced Imaging Assembly EUV telescopes. In that study, we obtained high-temporal resolution estimates of the OCBF parameters regulating …
Jets, Coronal “Puffs,” and a Slow Coronal Mass Ejection Caused by an Opposite-polarity Region within an Active Region Footpoint
Morgan, H.; Alzate, N.
During a period of three days beginning 2013 January 17, twelve recurrent reconnection events occur within a small region of opposing flux embedded within one footpoint of an active region, accompanied by flares and jets observed in EUV and fast and faint structureless “puffs” observed by coronagraphs. During the same period a slow structured CME …
Martian surface microtexture from orbital CRISM multi-angular observations: A new perspective for the characterization of the geological processes
Schmidt, F.; Douté, S.; Fernando, J.
The surface of Mars has a high morphological and mineralogical diversity due to the intricacy of external, internal processes, and exchanges with the atmosphere, the hydrosphere and the cryosphere. In particular, liquid water played an important role in surface evolution. However, the origin, duration and intensity of those wet events have been hi…
3D pyCloudy modelling of bipolar planetary nebulae: Evidence for fast fading of the lobes
Morisset, C.; Zijlstra, A. A.; Gesicki, K.
Aims: The origin and evolution of the shapes of bipolar planetary nebulae are poorly understood. We postulate that their history can be traced through their internal velocity fields in a procedure similar to the one well established for spherical objects. Such an analysis requires 3D photoionization and kinematical modelling that is computati…
Optical counterparts of two ULXs in NGC 5474 and NGC 3627 (M 66)
Akyuz, A.; Aksaker, N.; Avdan, S. +6 more
We identified two optical counterparts of brightest ultraluminous X-ray sources (ULXs) in galaxies NGC 5474 and NGC 3627 (M66). The counterparts in Hubble Space Telescope images are very faint, their V magnitudes are 24.7 (MV ≈ -4.5) and 25.9 (MV ≈ -4.2), respectively. NGC 5474 X-1 changes the X-ray flux more than two orders …
The Short Rotation Period of Hi’iaka, Haumea’s Largest Satellite
Margot, Jean-Luc; Brown, Michael E.; Fabrycky, Daniel C. +5 more
Hi’iaka is the larger outer satellite of the dwarf planet Haumea. Using relative photometry from the Hubble Space Telescope and Magellan and a phase dispersion minimization analysis, we have identified the rotation period of Hi’iaka to be ∼9.8 hr (double peaked). This is ∼120 times faster than its orbital period, creating new questions about the f…
An Analysis of Interplanetary Solar Radio Emissions Associated with a Coronal Mass Ejection
Magdalenić, J.; Eastwood, J. P.; Davies, J. A. +13 more
Coronal mass ejections (CMEs) are large-scale eruptions of magnetized plasma that may cause severe geomagnetic storms if Earth directed. Here, we report a rare instance with comprehensive in situ and remote sensing observations of a CME combining white-light, radio, and plasma measurements from four different vantage points. For the first time, we…
Interpreting the ionization sequence in star-forming galaxy emission-line spectra
Ferland, Gary J.; Hewett, Paul C.; Baldwin, Jack A. +4 more
High-ionization star-forming (SF) galaxies are easily identified with strong emission-line techniques such as the BPT diagram, and form an obvious ionization sequence on such diagrams. We use a locally optimally emitting cloud model to fit emission-line ratios that constrain the excitation mechanism, spectral energy distribution, abundances and ph…
Cloud clearing in the wake of Saturn's Great Storm of 2010-2011 and suggested new constraints on Saturn's He/H2 ratio
Baines, K. H.; Sromovsky, L. A.; Momary, T. W. +1 more
Saturn's Great Storm of 2010-2011 produced a planet-encircling wake that slowly transitioned from a region that was mainly dark at 5 µm in February 2011 to a region that was almost entirely bright and remarkably uniform by December of 2012. The uniformity and high emission levels suggested that the entire wake region had been cleared not onl…
Aggregate particles in the plumes of Enceladus
Ingersoll, Andrew P.; Zhang, Xi; Gao, Peter +1 more
Estimates of the total particulate mass of the plumes of Enceladus are important to constrain theories of particle formation and transport at the surface and interior of the satellite. We revisit the calculations of Ingersoll and Ewald (Ingersoll, A.P., Ewald, S.P. [2011]. Icarus 216(2), 492-506), who estimated the particulate mass of the Enceladu…