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Kinetic Alfvén wave explanation of the Hall fields in magnetic reconnection
Lavraud, Benoit; Wang, Chi; Dai, Lei +4 more
Magnetic reconnection is initiated in a small diffusion region but can drive global-scale dynamics in Earth's magnetosphere, solar flares, and astrophysical systems. Understanding the processes at work in the diffusion region remains a main challenge in space plasma physics. Recent in situ observations from Magnetospheric Multiscale and Time Histo…
Earth-Affecting Coronal Mass Ejections Without Obvious Low Coronal Signatures
Nitta, Nariaki V.; Mulligan, Tamitha
We present a study of the origin of coronal mass ejections (CMEs) that were not accompanied by obvious low coronal signatures (LCSs) and yet were responsible for appreciable disturbances at 1 AU. These CMEs characteristically start slowly. In several examples, extreme ultraviolet (EUV) images taken by the Atmospheric Imaging Assembly onboard the S…
The birth and growth of a solar wind cavity around a comet - Rosetta observations
Behar, E.; Nilsson, H.; Goetz, C. +2 more
The Rosetta mission provided detailed observations of the growth of a cavity in the solar wind around comet 67P/Churyumov-Gerasimenko. As the comet approached the Sun, the plasma of cometary origin grew enough in density and size to present an obstacle to the solar wind. Our results demonstrate how the initial slight perturbations of the solar win…
Hybrid loop quantum cosmology and predictions for the cosmic microwave background
Castelló Gomar, Laura; Mena Marugán, Guillermo A.; Martín de Blas, Daniel +1 more
We investigate the consequences of the hybrid quantization approach for primordial perturbations in loop quantum cosmology, obtaining predictions for the cosmic microwave background and comparing them with data collected by the Planck mission. In this work, we complete previous studies about the scalar perturbations and incorporate tensor modes. W…
Dust Properties of C II Detected z ∼ 5.5 Galaxies: New HST/WFC3 Near-IR Observations
Kartaltepe, J. S.; Scoville, N. Z.; Riechers, D. A. +7 more
We examine the rest-frame ultraviolet (UV) properties of 10 [C II]λ158 µm-detected galaxies at z ∼ 5.5 in COSMOS using new Hubble Space Telescope/Wide Field Camera 3 near-infrared imaging. Together with pre-existing 158 µm continuum and [C II] line measurements by the Atacama Large Millimeter/submillimeter Array, we study their dust at…
Titan's Topography and Shape at the End of the Cassini Mission
Hayes, A. G.; Iess, L.; Stiles, B. W. +6 more
With the conclusion of the Cassini mission, we present an updated topographic map of Titan, including all the available altimetry, SARtopo, and stereophotogrammetry topographic data sets available from the mission. We use radial basis functions to interpolate the sparse data set, which covers only ∼9% of Titan's global area. The most notable updat…
SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES): Faint-end Counts at 450 µm
Goto, Tomotsugu; Smail, Ian; Bunker, Andrew J. +40 more
The SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) is a three-year JCMT Large Program aiming to reach the 450 µm confusion limit in the COSMOS-CANDELS region to study a representative sample of the high-redshift far-infrared galaxy population that gives rise to the bulk of the far-infrared background. We present the first-year data from STU…
Comprehensive Analysis of the Geoeffective Solar Event of 21 June 2015: Effects on the Magnetosphere, Plasmasphere, and Ionosphere Systems
Fineschi, Silvano; Stangalini, Marco; Bruno, Roberto +34 more
A full-halo coronal mass ejection (CME) left the Sun on 21 June 2015 from active region (AR) NOAA 12371. It encountered Earth on 22 June 2015 and generated a strong geomagnetic storm whose minimum Dst value was −204 nT. The CME was associated with an M2-class flare observed at 01:42 UT, located near disk center (N12 E16). Using satellite data from…
On the initial binary population for star cluster simulations
Kroupa, Pavel; Belloni, Diogo; Rocha-Pinto, Helio J. +2 more
Colour-magnitude diagrams (CMDs) are powerful tools that might be used to infer stellar properties in globular clusters (GCs), for example, the binary fraction and their mass ratio (q) distribution. In the past few years, observations have revealed that q distributions of GC main-sequence binaries are generally flat, and a distribution characteriz…
Globular clusters with Gaia
Marinoni, S.; Pancino, E.; Bellazzini, M. +1 more
The treatment of crowded fields in Gaia data will only be a reality in a few years from now. In particular, for globular clusters, only the end-of-mission data (public in 2022-2023) will have the necessary full crowding treatment and will reach sufficient quality for the faintest stars. As a consequence, the work on the deblending and decontaminat…