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Improving Predictions of High-Latitude Coronal Mass Ejections Throughout the Heliosphere
Rodriguez, L.; Poedts, S.; Scolini, C. +2 more
Predictions of the impact of coronal mass ejections (CMEs) in the heliosphere mostly rely on cone CME models, whose performances are optimized for locations in the ecliptic plane and at 1 AU (e.g., at Earth). Progresses in the exploration of the inner heliosphere, however, advocate the need to assess their performances at both higher latitudes and…
Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS
Yelle, R. V.; Hörst, S. M.; Koskinen, T. T. +4 more
The Cassini spacecraft's last orbits directly sampled Saturn's thermosphere and revealed a much more chemically complex environment than previously believed. Observations from the Ion and Neutral Mass Spectrometer (INMS) aboard Cassini provided compositional measurements of this region and found an influx of material raining into Saturn's upper at…
The Extended Gaia-PS1-SDSS (GPS1+) Proper Motion Catalog
Goldman, Bertrand; Tian, Hai-Jun; Rix, Hans-Walter +3 more
The Gaia + PanSTARRS1 (PS1) + Sloan Digital Sky Survey (SDSS) + Two Micron All-Sky Survey (2MASS) (GPS1) catalog was released in 2017. It delivered precise proper motions for around 350 million sources down to a magnitude of $r\sim 20$ mag. In this study, we present GPS1+, the extension GPS1 catalog down to $r\sim 22.5$ mag, based on Gaia data rel…
Analysis of absorption lines in the high-resolution spectra of five hot post-AGB candidates
Herrero, A.; Simón-Díaz, S.; Hubrig, S. +3 more
From an analysis of absorption lines in the high-resolution spectra, we have derived the radial velocities, stellar parameters (Teff, log g, wind-strength parameter log Q, and projected rotational velocity), and abundances (C, N, O, and Si) of IRAS 17460-3114, IRAS 18131-3008, IRAS 19336-0400, LSE 45, and LSE 163. Abundances are found t…
Structural shock verification by numerical analysis of the EPD payload units on board Solar Orbiter spacecraft
Ravanbakhsh, Ali; García-Pérez, Andrés; Sorribes-Palmer, Félix +1 more
Electronic components can be seriously damaged during the launch of spacecraft due to the intense shock loads, which are generated by the launch operations such as the separations of the launcher stages and the release of the spacecraft. A shock verification program should be carried out in the development phase of space instruments to guarantee t…
Assessment of CESE-HLLD ambient solar wind model results using multipoint observation
Feng, Xueshang; Wei, Fengsi; Li, Huichao
For a three-dimensional magnetohydrodynamics solar wind model, it is necessary to carry out assessment studies to reveal its ability and limitation. In this paper, the ambient solar wind results of year 2008 generated by the CESE-HLLD 3D MHD model are compared with multipoint in-situ measurements during the late declining phase of solar cycle 23. …
Spectroscopic classification of a complete sample of astrometrically-selected quasar candidates using Gaia DR2
Milvang-Jensen, B.; Fynbo, J. P. U.; Steinhardt, C. L. +20 more
Here we explore the efficiency and fidelity of a purely astrometric selection of quasars as point sources with zero proper motions in the Gaia data release 2 (DR2). We have built a complete candidate sample including 104 Gaia-DR2 point sources, which are brighter than 20th magnitude in the Gaia G-band within one degree of the north Galactic pole (…
Active-region Tilt Angles from White-light Images and Magnetograms: The Role of Magnetic Tongues
Démoulin, Pascal; Mandrini, Cristina H.; Poisson, Mariano +1 more
The presence of elongations in active-region (AR) polarities, called magnetic tongues, is mostly visible during their emergence phase. AR tilts have been measured thoroughly using long-term white-light (WL) databases, sometimes combined with magnetic-field information. Since the influence of magnetic tongues on WL tilt measurements has not been ta…
Disk of 2MASS 15491331-3539118 = GQ Lup C as seen by HST and WISE
Alcalá, J. M.; Manara, C. F.; Frasca, A. +7 more
Aims: Very recently, a second companion on a wider orbit has been discovered around GQ Lup. This is a low-mass accreting star that is partially obscured by a disk seen at high inclination. If detected, this disk may be compared to the known disk around the primary.
Methods: We detected this disk on archive HST and WISE data.
Results…
Distortion of Magnetic Fields in BHR 71
Kwon, Jungmi; Nagata, Tetsuya; Tamura, Motohide +9 more
The magnetic field structure of a star-forming Bok globule BHR 71 was determined based on near-infrared polarimetric observations of background stars. The magnetic field in BHR 71 was mapped from 25 stars. By using a simple 2D parabolic function, the plane-of-sky magnetic axis of the core was found to be θmag = 125° ± 11°. The plane-of-…