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Morphological Classification of G-band Bright Points Based on Deep Learning
Yang, Yunfei; Feng, Song; Zhang, Xiaoli +4 more
The G-band bright points (GBPs) are driven by the granular convection flow, and appear with different morphologies in the quiet Sun, such as points, elongated chains, and knees. A point-like GBP represents a single slender flux tube, while the others represent the interaction of several slender flux tubes. This paper presents a deep-learning metho…
The Evolution of the Electron Number Density in the Coma of Comet 67P at the Location of Rosetta from 2015 November through 2016 March
Henri, P.; Edberg, N. J. T.; Rubin, M. +6 more
A comet ionospheric model assuming the plasma moves radially outward with the same bulk speed as the neutral gas and not being subject to severe reduction through dissociative recombination has previously been tested in a series of case studies associated with the Rosetta mission at comet 67P/Churyumov-Gerasimenko. It has been found that at low ac…
Radio-infrared correlation for local dusty galaxies and dusty AGNs from the AKARI All-Sky Survey
Pollo, Agnieszka; Bilicki, Maciej; Takeuchi, Tsutomu T. +3 more
We use the new release of the AKARI Far-Infrared All-Sky Survey (FIS) matched with the NVSS radio database to investigate the local (z < 0.25) far-infrared-radio correlation (FIRC) of different types of extragalactic sources. To obtain the redshift information for the AKARI FIS sources we cross-match the catalogue with the SDSS DR8. This also a…
Ultraviolet Activity as Indicators of Small-scale Magnetic Fields in γ Cassiopeiae
Smith, Myron A.
The recorded activity of γ Cas (B0.5 IVe) in the ultraviolet is important to an understanding of the mechanism behind this prototypical Be star’s high-energy activity, especially its hard X-ray emissions. The analysis here focuses first on the phasing of ultraviolet and optical light curves from different epochs. The rotational interpretation of t…
Coordinated Interplanetary Scintillation Observations in Japan and Russia for Coronal Mass Ejection Events in Early September 2017
Tokumaru, Munetoshi; Fujiki, Ken'ichi; Iwai, Kazumasa +2 more
Interplanetary (IP) shocks traveling between the Sun and the Earth's orbit were clearly detected in interplanetary scintillation (IPS) observations made at Toyokawa (Japan) and Pushchino (Russia), in association with two halo coronal mass ejections (CMEs) that occurred on 04 and 06 September 2017. Since the observation times at Toyokawa and Pushch…
Probing the initial conditions of high-mass star formation. III. Fragmentation and triggered star formation
Zhang, Chuan-Peng; Li, Guang-Xing; Wyrowski, Friedrich +6 more
Context. Fragmentation and feedback are two important processes during the early phases of star formation.
Aims: Massive clumps tend to fragment into clusters of cores and condensations, some of which form high-mass stars. In this work, we study the structure of massive clumps at different scales, analyze the fragmentation process, and invest…
The Convective Electric Field Influence on the Cold Plasma and Diamagnetic Cavity of Comet 67P
Henri, Pierre; Nilsson, Hans; Edberg, Niklas J. T. +5 more
We studied the distribution of cold electrons (<1 eV) around comet 67P/Churyumov-Gerasimenko with respect to the solar wind convective electric field direction. The cold plasma was measured by the Langmuir Probe instrument and the direction of the convective electric field {\boldsymbol{E}} conv = -{\boldsymbol{v}} × {\boldsymbol{B}} …
The Pivot Energy of Solar Energetic Particles Affecting the Martian Surface Radiation Environment
Wang, Yuming; Guo, Jingnan; Wimmer-Schweingruber, Robert F. +5 more
Space radiation is a major risk for humans, especially on long-duration missions to outer space, e.g., a manned mission to Mars. Galactic cosmic rays contribute a predictable radiation background; the main risk is due to the highly variable and currently unpredictable flux of solar energetic particles (SEPs). Such sporadic SEP events may induce ac…
Surface Temperatures and Water Ice Sublimation Rate of Oxo Crater: A Comparison With Juling Crater
Raponi, A.; De Sanctis, M. C.; Formisano, M. +3 more
Dwarf planet Ceres is characterized by several sites hosting (or have hosted) ice-rich patches as revealed by the Dawn's Visible and InfraRed spectrometer. The study of the illumination conditions including the effects of the local topography become critical in the estimation of the ice lifetime as well as the water vapor production rate. In this …
Herschel-HOBYS study of the earliest phases of high-mass star formation in NGC 6357
White, G. J.; Könyves, V.; Rygl, K. L. J. +19 more
Aims: To constrain models of high-mass star formation it is important to identify the massive dense cores (MDCs) that are able to form high-mass star(s). This is one of the purposes of the Herschel/HOBYS key programme. Here, we carry out the census and characterise of the properties of the MDCs population of the NGC 6357 H II region.
Met…