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Upstream Solar Wind Prediction up to Mars by an Operational Solar Wind Prediction System
Luo, Bingxian; Zhong, Qiuzhen; Liu, Siqing +10 more
Combining the upstream solar wind observations measured by Mars Atmosphere and Volatile Evolution (MAVEN), Advanced Composition Explorer(ACE) and Deep Space Climate Observatory (DSCOVR) from October 2014 to April 2021, we investigate the statistical properties of the background solar wind at Mars and Earth. By applying an operational solar wind pr…
An updated global survey of alluvial fans on Mars: Distinguishing alluvial fans from other fan-shaped features through morphologic characterization
Moersch, Jeffrey E.; Mondro, Claire A.; Fedo, Christopher M.
Alluvial fans formed on Mars during the late Hesperian to early Amazonian in a climatic transition from a time of regular surface water activity to the current dry and cold climate. The depositional environments recorded by alluvial fans represent the final era of potential habitability on the Martian surface. Alluvial fan deposits can often look …
Cyclical Behaviors of Sunspot-Group Tilt Angles in Solar Cycles 21 - 23
Gao, Peng-Xin
Based on the Debrecen Photoheliographic Data (DPD) sunspot catalog, we investigate the cyclical behaviors of tilt angles of all sunspot groups (SGs) and SGs with angular separation constraint S >2.5∘ in Solar Cycles (SCs) 21 - 23. It is found that, the cyclical behaviors of tilt angles during SC 23 are different from those of SCs 21 …
A monitoring campaign (2013-2020) of ESA's Mars Express to study interplanetary plasma scintillation
Bocanegra-Bahamón, T. M.; Molera Calvés, G.; Duev, D. A. +19 more
The radio signal transmitted by the Mars Express (MEX) spacecraft was observed regularly between the years 2013-2020 at X-band (8.42 GHz) using the European Very Long Baseline Interferometry (EVN) network and University of Tasmania's telescopes. We present a method to describe the solar wind parameters by quantifying the effects of plasma on our r…
The Emergence of a Neutral Wind Region in the Orbital Plane of Symbiotic Binaries during Their Outbursts
Skopal, Augustin
Accretion of mass onto a white dwarf (WD) in a binary system can lead to stellar explosions. If a WD accretes from stellar wind of a distant evolved giant in a symbiotic binary, it can undergo occasional outbursts in which it brightens by several magnitudes, produces a low- and high-velocity mass outflow, and, in some cases, ejects bipolar jets. I…
Anisotropies of solar energetic electrons in the MeV range measured with Solar Orbiter/EPD/HET
Rodríguez-Pacheco, J.; Wimmer-Schweingruber, R. F.; Dresing, N. +4 more
Aims: This study analyses relativistic electron measurements obtained by the High Energy Telescope (HET) aboard Solar Orbiter in the energy range from 200 keV to above 10 MeV. Caveats of these measurements are discussed. The purpose of this study is to analyse anisotropies of relativistic solar energetic electrons utilising the different view…
Deep Herschel observations of the 2 Jy sample: assessing the non-thermal and AGN contributions to the far-IR continuum
Könyves, V.; Morganti, R.; Tadhunter, C. N. +5 more
The far-IR/sub-mm wavelength range contains a wealth of diagnostic information that is important for understanding the role of active galactic nuclei (AGN) in galaxy evolution. Here we present the results of Herschel PACS and SPIRE observations of a complete sample of 46 powerful 2 Jy radio AGN at intermediate redshifts (0.05 < z < 0.7), whi…
Effects of ion composition on escape and morphology on Mars
Zhang, Qi; Holmström, Mats; Wang, Xiao-Dong
We refine a recently presented method to estimate ion escape from non-magnetized planets and apply it to Mars. The method combines in situ observations and a hybrid plasma model (ions as particles, electrons as a fluid). We use measurements from the Mars Atmosphere and Volatile Evolution (MAVEN) mission and Mars Express (MEX) for one orbit on 1 Ma…
Asteroseismology Sheds Light on the Origin of Carbon-deficient Red Giants: Likely Merger Products and Linked to the Li-rich Giants
Zhao, Gang; Campbell, Simon W.; Reddy, Bacham E. +2 more
Carbon-deficient red giants (CDGs) are a peculiar class of stars that have eluded explanation for decades. We aim to better characterize CDGs by using asteroseismology (Kepler, TESS) combined with spectroscopy (APOGEE, LAMOST), and astrometry (Gaia). We discovered 15 new CDGs in the Kepler field, and confirm that CDGs are rare, as they are only 0.…
Optical/X-ray/radio view of Abell 1213: A galaxy cluster with anomalous diffuse radio emission
De Grandi, S.; Riva, G.; Boschin, W. +5 more
Context. Abell 1213, a low-richness galaxy system, is known to host an anomalous radio halo detected in data of the Very Large Array (VLA). It is an outlier with regard to the relation between the radio halo power and the X-ray luminosity of the parent clusters.
Aims: Our aim is to analyze the cluster in the optical, X-ray, and radio bands to…