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Revisiting magnetospheric CAPS TOF data post Cassini
Wilson, R. J.; Reisenfeld, D. B.; Allen, R. C. +2 more
The Cassini Plasma Spectrometer has a Time-of-Flight sensor capable of separating out the major magnetospheric ions at Saturn of protons, ions with a mass to charge of 2 amu/q, and water group ions (O+, OH+, H2O+ and H3O+), yet until this study a survey of their relative proportions…
Mapping Solar X-Ray Images from SDO/AIA EUV Images by Deep Learning
Yang, Bo; Yang, Jiayan; Bi, Yi +6 more
The full-Sun corona is now imaged every 12 s in extreme ultraviolet (EUV) passbands by Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), whereas it is only observed several times a day at X-ray wavelengths by Hinode/X-Ray Telescope (XRT). In this paper, we apply a deep-learning method, i.e., the convolution neural network (CNN), to es…
Radiometric Calibration of the Rosetta Navigation Camera
Statella, Thiago; Andrés, Rafael; Geiger, Bernhard
The Navigation Camera (NavCam) on board the Rosetta spacecraft was essential for optical navigation in the vicinity of the comet 67P/Churyumov-Gerasimenko. Images acquired throughout the mission are also of high scientific interest. In order to extend the range of potential applications, we generated datasets of radiometrically calibrated images. …
On the photoevaporation, dust polarization and kinematics of two nebulae in Sh2-236
Soam, Archana
In the work presented here, the impact of magnetic field on the dynamical evolution of cometary globules Sim 129 and Sim 130 in the Sh2-236 HII region and the ionized gas streaming out of their surfaces is investigated. The magnetic field morphology in the region associated with these globules is inferred using optical polarization measurements wi…
Identification of additional young nearby runaway stars based on Gaia data release 2 observations and the lithium test
Torres, Guillermo; Mugrauer, Markus; Michel, Kai-Uwe +4 more
Runaway stars are characterized by their remarkably high space velocities, and the study of their formation mechanisms has attracted considerable interest. Young, nearby runaway stars are the most favorable for identifying their place of origin, and for searching for possible associated objects such as neutron stars. Usually, the research field of…
Identifying Circumgalactic Medium Absorption in QSO Spectra: A Bayesian Approach
Scott, Jennifer E.; Shoemaker, Emileigh S.; Hamill, Colin D.
We present a study of candidate galaxy-absorber pairs for 43 low-redshift QSO sightlines (0.06 < z < 0.85) observed with the Hubble Space Telescope/Cosmic Origins Spectrograph that lie within the footprint of the Sloan Digital Sky Survey with a statistical approach to match absorbers with galaxies near the QSO lines of sight using only the S…
‘Campfires’ may drive heating of solar atmosphere
Clery, Daniel
Researchers are getting closer to solving the mystery of why the Sun's wispy atmosphere is nearly 200 times hotter than its surface. Temperatures ought to decline as one moves out from the Sun's core, but the solar atmosphere, or corona, seethes at more than 1 million degrees Celsius, far hotter than the 5500°C temperature of the surface. Flares h…
UVIT-HST-Gaia-VISTA study of Kron 3 in the Small Magellanic Cloud: a cluster with an extended red clump in ultraviolet
Cioni, Maria-Rosa L.; Chung, Chul; Bell, Cameron P. M. +6 more
We have demonstrated the advantage of combining multiwavelength observations, from the ultraviolet (UV) to near-infrared, to study Kron 3, a massive star cluster in the Small Magellanic Cloud. We have estimated the radius of the cluster Kron 3 to be 2.0 arcmin and for the first time, we report the identification of NUV-bright red clump (RC) stars …
Reduced Microwave Brightness Temperature in a Sunspot Atmosphere Due to Open Magnetic Fields
White, S. M.; Vrublevskis, A.; Ryabov, B. I.
Motivated by dark coronal lanes in 284 Å extreme-ultraviolet (EUV) observations from the Extreme-ultraviolet Imaging Telescope on board the Solar and Heliospheric Observatory (SOHO/EIT), we construct and optimize an atmosphere model of the active region (AR) 8535 sunspot by adding a cool and dense component in the volume of plasma along open field…
Estimation of ages and masses via carbon and nitrogen abundances for 556 007 giants from LAMOST
Zhao, Gang; Buder, Sven; Wu, Ya-Qian +1 more
Estimating ages for a large number of giants is of great importance for studying Galactic evolution. In this work, we determine stellar ages and masses for 556 007 giants from LAMOST Data Release 5 (DR5) with empirical relations estimated from chemical [C/N] abundance ratios. Our sample reveals the two well-known sequences in the age-[α/M] relatio…