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Comparing extrapolations of the coronal magnetic field structure at 2.5 R⊙ with multi-viewpoint coronagraphic observations
Sasso, C.; Romoli, M.; Andretta, V. +19 more
The magnetic field shapes the structure of the solar corona, but we still know little about the interrelationships between the coronal magnetic field configurations and the resulting quasi-stationary structures observed in coronagraphic images (such as streamers, plumes, and coronal holes). One way to obtain information on the large-scale structur…
Parametric Study of ICME Properties Related to Space Weather Disturbances via a Series of Three-Dimensional MHD Simulations
Moon, Yong-Jae; Magara, Tetsuya; Hayashi, Keiji +1 more
Interplanetary coronal mass ejections (ICMEs) are important drivers of space-weather disturbances observed at the Earth. We use a parameterized ICME model to investigate the relation between the physical properties of an ICME and these disturbances. Compared to those studies focused on deriving a best set of ICME parameter values matched with obse…
On the Power-Law Distribution of Pitch-Angle Scattering Times in Solar Wind Turbulence
Zimbardo, Gaetano; Perri, Silvia; Pucci, Francesco +1 more
The propagation of energetic particles in the solar wind depends in a sensitive way on the pitch-angle scattering of particles in the presence of magnetic turbulence. The well-known quasi-linear theory gives an expression for the pitch-angle scattering rate under the assumption of small turbulence levels, but both in the solar wind and in other as…
Identifications of faint Chandra sources in the globular cluster M3
Heinke, Craig O.; Cool, Adrienne M.; Zhao, Yue +2 more
We report a 30 ksChandra ACIS-S survey of the globular cluster M3. Sixteen X-ray sources were detected within the half-light radius (2.3 arcmin) with L_X ≳ 2.3 × 10^{31} erg s^{-1}. We used Hubble Space Telescope WFC3/UVIS and ACS/WFC images to find 10 plausible optical/UV counterparts. We fit the spectral energy distribution of the known cataclys…
Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta
Lamy, P. L.; Lara, L. M.; Bertaux, J. -L. +53 more
Context. On 27 April 2015, when comet 67P/Churyumov-Gerasimenko was at 1.76 au from the Sun and moving toward perihelion, the OSIRIS and VIRTIS-M instruments on board the Rosetta spacecraft simultaneously observed the evolving dust and gas coma during a complete rotation of the comet.
Aims: We aim to characterize the spatial distribution of d…
Radial Velocities in the Outermost Disk toward the Anticenter
Allende Prieto, C.; López-Corredoira, M.; Sylos Labini, F. +1 more
We measure the mean Galactocentric radial component of the velocity of stars (v R ) in the disk at 8 kpc < R < 28 kpc in the direction of the anticenter. For this, we use the Apache Point Galactic Evolution Experiment. Furthermore, we compare the result with H I maps along the same line of sight. We find an increase in positive (…
PoGO+ polarimetric constraint on the synchrotron jet emission of Cygnus X-1
Takahashi, Hiromitsu; Uchida, Nagomi; Kataoka, Jun +8 more
We report a polarimetric constraint on the hard X-ray synchrotron jet emission from the Cygnus X-1 black hole binary system. The observational data were obtained using the PoGO+ hard X-ray polarimeter in 2016 July, when Cygnus X-1 was in the hard state. We have previously reported that emission from an extended corona with a low polarization fract…
Assessing the Acceptability of Science Operations Concepts and the Level of Mission Enhancement of Capabilities for Human Mars Exploration Extravehicular Activity
Beaton, K. H.; Chappell, S. P.; Abercromby, A. F. J. +7 more
The Biologic Analog Science Associated with Lava Terrains (BASALT) research project is investigating tools, techniques, and strategies for conducting Mars scientific exploration extravehicular activity (EVA). This has been accomplished through three science-driven terrestrial field tests (BASALT-1, BASALT-2, and BASALT-3) during which the iterativ…
Modeling the Protoplanetary Disks of Two Brown Dwarfs in the Taurus Molecular Cloud
Espaillat, Catherine C.; Macías, Enrique; Rilinger, Anneliese M.
Measuring the properties of protoplanetary disks around brown dwarfs (BDs) is central to understanding the formation of BDs and their planetary companions. We present modeling of CFHT Tau 4 and 2M0444, two BDs with protoplanetary disks in the Taurus Molecular Cloud. By combining modeling of the spectral energy distributions and Atacama Large Milli…
The retrograde orbit of the globular cluster FSR1758 revealed with Gaia DR2
Simpson, Jeffrey D.
We report the first radial velocity measurements of the recently identified globular cluster FSR1758. From the two member stars with radial velocities from the Gaia Radial Velocity Spectrograph reported in Gaia DR2, we find FSR1758 has a radial velocity of 227 ± 1 km s^{-1}. We also find potential extra-tidal star lost from the cluster in the surr…