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Novel scaling laws to derive spatially resolved flare and CME parameters from sun-as-a-star observables
Mohan, Atul; Akiyama, Sachiko; Gopalswamy, Natchimuthuk +1 more
Coronal mass ejections (CMEs) are often associated with X-ray (SXR) flares powered by magnetic reconnection in the low corona, while the CME shocks in the upper corona and interplanetary (IP) space accelerate electrons often producing the type II radio bursts. The CME and the reconnection event are part of the same energy release process as highli…
Deciphering the evolution of thermodynamic properties and their connection to the global kinematics of high-speed coronal mass ejections using FRIS model
Wang, Yuming; Nieves-Chinchilla, Teresa; Mishra, Wageesh +3 more
Most earlier studies have been limited to estimating the kinematic evolution of coronal mass ejections (CMEs), and only limited efforts have been made to investigate their thermodynamic evolution. We focus on the interplay of the thermal properties of CMEs with their observed global kinematics. We implement the Flux rope Internal State model to es…
Charging effects on Rosetta dust measurements
Deca, Jan; Horányi, Mihály
Dust particles released from comet 67P/Churyumov-Gerasimenko collect electrostatic charges. Their motion is influenced by the electric fields induced by the flow of the solar wind and by the charging of the Rosetta spacecraft itself. Dust grains with sufficiently low tensile strength might even be destroyed en route from the nucleus to Rosetta. A …
Unveiling the origin of XMM-Newton soft proton flares: II. Systematics in the proton spectral analysis
Cappi, M.; Molendi, S.; Gastaldello, F. +7 more
Context. Low-energy (< 300 keV) protons entering the field of view of the XMM-Newton telescope scatter with the X-ray mirror surface and might reach the X-ray detectors on the focal plane. They manifest in the form of a sudden increase in the rates, usually referred to as soft proton flares. By knowing the conversion factor between the soft pro…
Effects of surface and subsurface water/ice on spatial distributions of impact crater ejecta on Mars
Wünnemann, Kai; Thomas, Nicolas; Sokołowska, Aleksandra
Ejecta blankets around craters on a km-scale show stark differences in the ejecta mobility (maximal extent of ejecta divided by the crater radius) with latitude and types of plains on Mars, which has been known for a long time (Barlow and Pollak, 2002; Li et al., 2015) but is not well-understood. Our main goal is to explore the idea that the subsu…
Stellar Pulsation and Evolution: A Combined Theoretical Renewal and Updated Models (SPECTRUM). I. Updating Radiative Opacities for Pulsation Models of Classical Cepheid and RR-Lyrae
Marconi, Marcella; Molinaro, Roberto; De Somma, Giulia +1 more
Pulsating stars are universally recognized as precise distance indicators and tracers of stellar populations. Their variability, combined with well-defined relationships between pulsation properties and intrinsic evolutionary parameters such as luminosity, mass, and age, makes them essential for understanding galactic evolution and retrieving star…
Deepest Limits on Scattered Light Emission from the Epsilon Eridani Inner Debris Disk with HST/STIS
Stark, Christopher C.; Debes, John H.; Hom, Justin +9 more
Epsilon Eridani is one of the first debris disk systems detected by the Infrared Astronomical Satellite. However, the system has thus far eluded detection in scattered light with no components having been directly imaged. Its similarity to a relatively young solar system combined with its proximity makes it an excellent candidate to further our un…
Testing He II Emission from Wolf–Rayet Stars as a Dust Attenuation Measure in Eight Nearby Star-forming Galaxies
Leitherer, Claus; Lee, Janice C.; Maschmann, Daniel +2 more
The ability to determine galaxy properties such as masses, ages, and star formation rates robustly is critically limited by the ability to measure dust attenuation accurately. Dust reddening is often characterized by comparing observations to models of either nebular recombination lines or the UV continuum. Here, we use a new technique to measure …
Archives of Photographic PLates for Astronomical USE (APPLAUSE). Digitisation of astronomical plates and their integration into the International Virtual Observatory
Enke, Harry; Heber, Ulrich; Tuvikene, Taavi +2 more
Aims: The Archives of Photographic PLates for Astronomical USE (APPLAUSE) project is aimed at digitising astronomical photographic plates from three major German plate collections, making them accessible through integration into the International Virtual Observatory (IVO).
Methods: Photographic plates and related materials (logbooks, env…
Berkeley 76: An intermediate age open star cluster in Gaia Era
Bisht, D.; Rangwal, Geeta; Raj, A. +3 more
We studied the open star cluster Berkeley 76 using Gaia DR3 and 2MASS data sets. We obtained 314 most probable cluster members with a membership probability greater than 80%. We have found the cluster center as α = 106.67 ± 0.07 deg and δ=‑11.75±0.07 deg. The mean PMs of cluster members in right ascension and declination are ‑0.60±0.22 and 1.35 ± …