Search Publications
How Solar Soft X-Ray Irradiance Is Affected by the Size of Field of View
Takeda, Aki; Boland, Shannon
Soft X-ray images of the Sun obtained with multiple broadband filters provide a simple and useful method to calculate averaged coronal temperature and emission measure, from which we can further calculate solar X-ray irradiance in physical units, e.g., watts per square meter. However, X-ray telescopes are often designed for pursuing high spatial r…
Extent of the Magnetotail of Venus From the Solar Orbiter, Parker Solar Probe and BepiColombo Flybys
Sorriso-Valvo, Luca; Edberg, Niklas J. T.; Persson, Moa +20 more
We analyze data from multiple flybys by the Solar Orbiter, BepiColombo, and Parker Solar Probe (PSP) missions to study the interaction between Venus' plasma environment and the solar wind forming the induced magnetosphere. Through examination of magnetic field and plasma density signatures we characterize the spatial extent and dynamics of Venus' …
Implications of Photon-Axion Oscillations on X-Ray Observations of the Coma Cluster
Pulatova, N.; Tugay, A.; Zadorozhna, L. +3 more
Axion-like particles (ALPs) emerge as predictions from various extensions of the Standard Model, standing out as plausible candidates for dark matter. Axions are thought to be produced when light passes through regions of magnetic fields. This positions astrophysical environments as prime sites for their production and subsequent detection. Howeve…
The Sun's Magnetic Power Spectra over Two Solar Cycles. II. Cycle Dependence of Active Regions, a Magnetic Network, and Their Relation
Wang, Ruihui; Jiang, Jie; Luo, Yukun
The multiscaled solar magnetic field consists of two major components: active regions (ARs) and magnetic network. Unraveling the cycle-dependent properties and interrelations of these components is crucial for understanding the evolution of the solar magnetic field. In this study, we investigate these components using magnetic power spectra derive…
Orbit of the Patroclus–Menoetius Binary System and Predictions for the 2024/2025 Mutual Events Season
Popescu, Marcel; Licandro, Javier; Berthier, Jérôme +5 more
We report on the ephemeris development for Menoetius, the satellite of Patroclus. Our data set consisted of ground–based and Hubble Space Telescope relative astrometry, as well as 42 lightcurves from the mutual events seasons in 2007, 2012, and 2017/2018. Our dynamical model included the effects of oblate, nonspherical shapes of the components, an…
Editorial: Circulation of heavy ions and their role in regulating the near-earth plasma dynamics
Chen, Lunjin; Kronberg, Elena; Bashir, M. Fraz
Observaciones fotométricas ópticas de candidatas a galaxias en el survey VVV
González, J. F.; Zarate, F.; Duplancic, F. +4 more
A sample of galaxy candidates observed in the south region of the galactic bulge of Vista Variables in the Via Láctea survey is presented in this work. With the use of the Double Astrograph from the Estación de Altura Carlos Ulrrico Cesco the magnitudes in the visible light of 35 galaxy candidates were obtained. This galaxy candidates were selecte…
Interpretation of the Transit Light Curve in the Presence of Principal Main Minimum with Allowance for the Eccentricity of the Transit (Planet) Orbit
Abubekerov, M. K.; Gostev, N. Yu.
Using a high-precision algorithm for interpreting transit light curves in a model of a classical eclipsing binary star-exoplanet system, we studied the possibility of determining the system parameters in the absence of a priori knowledge of the orbital eccentricity. It was shown that it is impossible to determine the exact value of the eccentricit…
A treatment of the all-clear problem for solar energetic particle events and subsequent decision making
Georgoulis, Manolis K.
We discuss the relatively overlooked problem of All Clear in Solar Energetic Particle (SEP) event prediction. These proton and heavier ion events are injected in major solar eruptions, propagate directionally into the heliosphere at relativistic speeds and threaten equipment and personnel at low-Earth orbit and beyond. SEPs are rare to extreme eve…
New 1.38-µm Water Vapor Band Spectroscopy for a CO2 Atmosphere: H2O Measurements in the Martian Atmosphere in the SPICAM/MEX and ACS NIR/TGO Experiments
Montmessin, F.; Fedorova, A. A.; Korablev, O. I. +5 more
The H2O 1.38-µm band has been used to measure water vapor in the Martian atmosphere since the MAWD (Mars Atmospheric Water Detector) experiment on Viking-1 and -2. Currently, two experiments in orbit around Mars—SPICAM IR (SPectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars InfraRed) on Mars Express and A…