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Radiation environment on TGO Mars orbit during solar particle events in January–October 2024. Corresponding solar eruptions and GOES proton fluxes data
Gopalswamy, Nat; Semkova, Jordanka; Koleva, Rositza +16 more
The dosimeter Liulin-MO for measuring the radiation environment on board the ExoMars Trace Gas Orbiter (TGO) is a module in the Fine Resolution Epithermal Neutron Detector (FREND). A number of solar energetic particle (SEP) events were observed in Mars orbit from July 2021 to 2024 during the increasing phase and close to the maximum of the 25th so…
Mars ionosphere TEC estimation from MARSIS data: A new approach
Sánchez-Cano, B.; Orosei, R.; Cartacci, M. +3 more
We describe a new implementation of the Contrast Method (CM) algorithm (Picardi and Sorge, 2000; Ilyushin Ya and Kunitsyn, 2004; Cartacci et al., 2013) used to correct the phase distortion of the echoes recorded by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) (Picardi et al., 2005; Jordan et al., 2009) in its subsurface …
Mars Express investigations of the Martian ionosphere using ASPERA-3 and new MARSIS fixed frequency modes
Barabash, Stas; Holmstrom, Mats; Sánchez-Cano, Beatriz +7 more
The plasma package Analyzer of Space Plasma and Energetic Atoms (ASPERA-3) onboard Mars Express has observed ions and electrons accelerated by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) radar when it operates in its active ionospheric sounding mode. To better study the processes involved, new operational modes for MARS…
Spatial distribution and clustering properties of the young stellar populations in the Carina Nebula complex and Car OB1
Preibisch, T.; Göppl, C.
Aims. We use Gaia DR3 astrometry and photometry to analyze the spatial distribution of the young stellar populations and stellar clusters and to search for new OB star candidates in the Carina Nebula complex and the full extent (∼5°, corresponding to ∼200 pc) of the Car OB1 association. Methods. We first performed a new census of high-mass stars i…
Exploring coronal abundances of M dwarfs at moderate activity levels
Wood, B. E.; Alvarado-Gómez, J. D.; Poppenhäger, K. +1 more
Context. Main sequence stars of spectral types F, G, and K with low to moderate activity levels exhibit a recognizable pattern known as the first ionization potential effect (FIP effect), where elements with lower first ionization potentials are more abundant in the stellar corona than in the photosphere. In contrast, high activity main sequence s…
Statistical investigation of solar flares showing quasi-periodicity based on STIX quick-look light curves
Mrozek, T.; Szaforz, Ż.; Tomczak, M.
Context. The emission of radiation associated with the release of energy in solar flares is often modulated according to a quasi-oscillatory pattern. This behavior is known as quasi-periodic pulsation (QPP). In this work, the STIX instrument on board Solar Orbiter was used to study solar flares that show quasi-periodic variations in X-ray emission…
Reflection-dominated Compton-thick AGN candidates in the SRG/eROSITA Lockman Hole survey
Gilfanov, M. R.; Medvedev, P. S.; Sunyaev, R. A. +2 more
We search for reflection-dominated Compton-thick active galactic nuclei (CT AGN) candidates in the Lockman Hole (LH) region using the data of SRG/eROSITA LH survey. We selected sources with anomalously hard photon indices in the 0.3-8.0 keV band, untypical for Type I AGN. In particular, we required that the upper end of the 90 per cent error inter…
JWST photometry and astrometry of 47 Tucanæ: Discontinuity in the stellar sequence at the star–brown dwarf transition
Anderson, J.; Bedin, L. R.; Nardiello, D. +10 more
Using JWST Near Infrared Camera (NIRCam) images of the globular cluster 47 Tucanæ (or NGC 104), taken at two epochs just 7 months apart, we derived proper-motion membership down to mF322W2 ∼ 27. We identified an intriguing feature at the very low-mass end of the main sequence, around ∼0.08 Mṡ, at magnitudes mF322W2…
Overdensity of Lyman-break galaxy candidates around hot-dust-obscured galaxies
Tsai, Chao-Wei; Jun, Hyunsung D.; Eisenhardt, Peter R. M. +15 more
Hot dust-obscured galaxies (hot DOGs) are a family of hyper-luminous, heavily obscured quasars. A number of studies based on the identification of companions at optical to far-infrared (FIR) wavelengths have shown that these objects reside in significantly overdense regions of the Universe. Here we present further characterisation of their environ…
Type IV-like Solar Radio Burst Consisting of a Series of Short-time Bursts Observed by PSP
Bale, Stuart D.; Ning, Zongjun; Pulupa, Marc +3 more
Solar and interplanetary radio bursts can reflect the existence and motion of energetic electrons and are therefore a kind of vital phenomenon in solar activities. The present study reported a solar radio storm observed by the Parker Solar Probe (PSP) in its eighth orbital encounter phase, and it lasted about 20 hr in a frequency range of 0.5–15 M…