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Observations of whistler mode waves by Solar Orbiter's RPW Low Frequency Receiver (LFR): In-flight performance and first results
Maksimovic, M.; Bale, S. D.; Chust, T. +29 more
Context. The Radio and Plasma Waves (RPW) instrument is one of the four in situ instruments of the ESA/NASA Solar Orbiter mission, which was successfully launched on February 10, 2020. The Low Frequency Receiver (LFR) is one of its subsystems, designed to characterize the low frequency electric (quasi-DC - 10 kHz) and magnetic (∼1 Hz-10 kHz) field…
Characteristics of source locations and solar cycle distribution of the strong solar proton events (≥1000 pfu) from 1976 to 2018
Le, Gui-Ming; Zhao, Ming-Xian; Qi-Li +3 more
We studied the source locations and solar cycle distribution of strong solar proton events (SPEs, ≥1000 pfu) measured at the Earth from 1976 to 2018. There were 43 strong SPEs during this period. 27.9 per cent of the strong SPEs were ground level enhancement (GLE) events. We detect more strong SPEs coming from the Western hemisphere. The strong SP…
Kelvin-Helmholtz Instability Associated with Reconnection and Ultra Low Frequency Waves at the Ground: A Case Study
Grigorenko, E. E.; Kronberg, E. A.; Nykyri, K. +7 more
The Kelvin-Helmholtz instability (KHI) and its effects relating to the transfer of energy and mass from the solar wind into the magnetosphere remain an important focus of magnetospheric physics. One such effect is the generation of Pc4-Pc5 ultra low frequency (ULF) waves (periods of 45-600 s). On 3 July 2007 at ~0500 magnetic local time the Cluste…
Prediction of Soft Proton Intensities in the Near-Earth Space Using Machine Learning
Tiengo, Andrea; Allen, Robert C.; Gastaldello, Fabio +14 more
The spatial distribution of energetic protons contributes to the understanding of magnetospheric dynamics. Based upon 17 yr of the Cluster/RAPID observations, we have derived machine-learning-based models to predict the proton intensities at energies from 28 to 962 keV in the 3D terrestrial magnetosphere at radial distances between 6 and 22 R…
Unveiling short-period binaries in the inner VVV bulge
Minniti, D.; Contreras Ramos, R.; Saito, R. K. +5 more
Most of our knowledge of the structure of the Milky Way has come from the study of variable stars. Among these variables, mimicking the periodic variation of pulsating stars, are eclipsing binaries. These stars are important in astrophysics because they allow us to directly measure the radii and masses of the components, as well as the distance to…
Element Abundance Analysis of the Metal-rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Shi, Jianrong; Ma, Jun; Du, Cuihua +3 more
Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopic surveys, we define two kinds of star samples: high-velocity thick disk (HVTD) with vφ > 90 km s-1 and metal-rich stellar halo (MRSH) with vφ < 90 km s-1. Due to high-resolution spectra data from APOGEE (DR16), we can accura…
Investigation of the in-flight anomalies of the LISA Pathfinder Test Mass release mechanism
Bortoluzzi, D.; Mendes, J.; Vignotto, D. +1 more
The LISA Pathfinder mission was flown to test some key technologies for the in-flight detection of gravitational waves. The mechanism developed to initialise the science phase, releasing the test mass into a geodesic trajectory, produced unexpected test mass states, requiring dedicated in-flight and on-ground test campaigns. Due to the limited inf…
A spectroscopically confirmed Gaia-selected sample of 318 new young stars within ∼200 pc
Zhou, George; Nordlander, Thomas; Žerjal, Maruša +7 more
In the Gaia era, the majority of stars in the Solar neighbourhood have parallaxes and proper motions precisely determined while spectroscopic age indicators are still missing for a large fraction of low-mass young stars. In this work, we select 756 overluminous late K and early M young star candidates in the southern sky and observe them over 64 n…
Search for age pattern across spiral arms of the Milky Way
Xu, Ye; Hou, Li-Gang; He, Zhi-Hong
The age pattern across spiral arms is one of the key observational features utilised to study the dynamic nature of the Galaxy's spiral structure. With the most updated samples of high-mass star formation region (HMSFR) masers, O stars and open clusters, we investigated their distributions and kinematic properties in the vicinity of the Sun. We fo…
Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83
Cooper, W. J.; Marocco, F.; Koester, D. +8 more
Spectroscopic observations of white dwarfs reveal that many of them are polluted by exoplanetary material, whose bulk composition can be uniquely probed this way. We present a spectroscopic and photometric analysis of the DA white dwarf WDJ181417.84-735459.83, an object originally identified to have a strong infrared (IR) excess in the 2MASS and W…