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An Integrated Nonlinear Analysis (INA) Software for Space Plasma Turbulence
Echim, Marius; Munteanu, Costel; Kovács, Péter
We built an integrated nonlinear analysis software (INA)-designed to study space plasma turbulence and intermittency. The MATLAB programming environment was used for the algorithmic development and implementation of methods for spectral analysis, multiscale fluctuations and multifractal analysis. The performance of INA is demonstrated using magnet…
Jupiter's equatorial X-ray emissions over two solar cycles
Coates, A. J.; Branduardi-Raymont, G.; Dunn, W. R. +2 more
Jupiter's disc is bright in X-rays as H2 molecules in the atmosphere are very effective at scattering solar X-rays. K-shell fluorescence from carbon atoms in atmospheric methane is thought to also provide a minor contribution. XMM-Newton has now observed Jupiter over a span of nearly two solar cycles from 2003 to 2021, offering the oppo…
Flapping motion configurations of geomagnetotail current sheet
Dunlop, M.; Rong, Zhaojin; Shen, Chao +5 more
We explore the geometry of the flapping motion of geomagnetotail current sheet with the magnetic measurements of the Cluster (constellation) using a newly developed technique. The principal curvatures and directions of the surfaces of the flapping current sheet are successfully deduced by the normal field analysis (NFA). Results show that the dire…
Analysis of photospheric magnetic fields in AR 12546: a case study
Abdelkawy, Ali G. A.; Shaltout, Abdelrazek M. K.
We investigate high-resolution observations with the spectropolarimeter (SP) aboard the Hinode satellite of the Solar Optical Telescope (SOT) of a positive polarity sunspot of an active region (AR) (NOAA 12546). We present a case study for the properties of the thermal, magnetic field, and plasma flows as a function of the optical depth from the i…
Solar Physics in the 2020s: DKIST, Parker Solar Probe, and Solar Orbiter as a Multi-Messenger Constellation
Müller, D.; Parenti, S.; Andretta, V. +21 more
The National Science Foundation (NSF) Daniel K. Inouye Solar Telescope (DKIST) has started operations at the summit of Haleakalā (Hawai'i). DKIST joins the nominal science phases of the NASA and ESA Parker Solar Probe and Solar Orbiter encounter missions. By combining in-situ measurements of the near-Sun plasma environment and detailed remote obse…
Identifying the population of T-Tauri stars in Taurus: UV–optical synergy
Arun, R.; Mathew, Blesson; Ujjwal, K. +9 more
With the third data release of the Gaia mission, Gaia DR3 with its precise photometry and astrometry, it is now possible to study the behavior of stars at a scale never seen before. In this paper, we developed new criteria to identify T-Tauri stars (TTS) candidates using UV and optical color-magnitude diagrams (CMDs) by combining the GALEX and Gai…
Iron Kα echoes from the circumnuclear disk orbiting Sgr A⋆
Haardt, Francesco; Ponti, Gabriele; Stel, Giovanni
Context. Molecular clouds in the Galactic center (GC) reprocess radiation from past outbursts of nearby high-energy sources, generating a bright Fe Kα fluorescence at 6.4 keV. The closest clouds to the GC are only ≃1.5 pc from Sgr A⋆, forming a torus-like structure known as the circumnuclear disk (CND). The study of fluorescence emissio…
Linear and nonlinear kinetic Alfvén waves at Venus
Fichtner, H.; Lazar, M.; Moslem, W. M. +1 more
Space observations show that Venus suffers significant atmospheric erosion caused by the solar wind forcing. Plasma acceleration is found to be one of the main mechanisms contributing to the global atmospheric loss at Venus through its magnetotail. Motivated by these observations, we propose that kinetic Alfvén waves (KAW) may be a possible candid…
New constraints on decaying dark matter from INTEGRAL/SPI
Santangelo, A.; Ducci, L.; Malyshev, D. +1 more
Based on almost 20 yr of data collected by the high-resolution spectrometer SPI on board the International Gamma-Ray Astrophysics Laboratory (INTEGRAL), we present constraints on a decaying dark matter particle undergoing a decay into two bodies, at least one of which is a photon, manifesting itself via a narrow line-like spectral feature. Our ON-…
Kinetic study of ion acoustic waves in Venusian ionosphere
Lakhina, G. S.; Kamalam, T.; Singh, S. V. +1 more
Kinetic dispersion of the ion acoustic waves has been explored for an unmagnetized five component plasma system comprising of Venusian protons, Venusian oxygen ions, Venusian electrons, solar wind protons, and kappa electrons. The solar wind protons and electrons are assumed to be streaming along the ambient magnetic field. The plasma parameters f…