A5062256299- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Magnetic confinement fusion research
- Ocean Waves and Remote Sensing
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Photovoltaic System Optimization Techniques
Astrophysique, Instrumentation et Modélisation
2024
Centre National de la Recherche Scientifique
2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2024
CEA Paris-Saclay
2024
Université Paris-Saclay
2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2024
Université Paris Cité
2024
KU Leuven
2021-2022
National Technological University
2019-2020
Consejo Nacional de Investigaciones Científicas y Técnicas
2019-2020
AWSOM-type models (Van der Holst et al. 2014) have been very successful in describing the solar atmosphere by incorporating Alfven wave driving as extra contributions global MHD equations. However, they lack from other modes. In this paper, we aim to write governing equations for energy evolution equation of kink waves. a similar manner AWSOM, combine with MHD. Our goal is incorporate heating provided uniturbulent damping We attempt construct UAWSOM (uniturbulence and driven models)....
wave solar models (AWSOMs) have been very successful in describing the atmosphere by incorporating driving as extra contributions global MHD equations. However, they lack from other modes. We aim to write governing equations for energy evolution equation of kink waves. In a similar manner AWSOM, we combine kink-wave-evolution with MHD. Our goal is incorporate heating provided uniturbulent damping attempt construct UAWSOM (uniturbulence and driven models). recently described terms Q...
Generalising the Elsässer variables, we introduce $Q$ -variables. These are more flexible than because they also allow us to track waves with phase speeds different Alfvén speed. We rewrite magnetohydrodynamics (MHD) equations these consider linearised version of resulting MHD in a uniform plasma, and recover classical waves, but separate fast slow magnetosonic into upward- downward-propagating waves. Moreover, show that -variables may surface non-uniform displaying power our generalisation....
Three dimensional magnetohydrodynamical simulations were carried out in order to perform a new polarization study of the radio emission supernova remnant SN 1006. These consider that expands into turbulent interstellar medium (including both magnetic field and density perturbations). Based on referenced-polar angle technique, statistical was done observational numerical position-angle distributions. Our results show with an adiabatic index 1.3 can reproduce properties 1006 remnant. This...
Context. A highly important aspect of solar activity is the coupling between eruptions and surrounding coronal magnetic field topology, which determines trajectory morphology ejected plasma. Pseudostreamers (PSs) are structures formed by arcs twin loops capped lines from holes same polarity that meet at a central spine. PSs contain single null point in spine, immediately above closed lines, potentially influences evolution nearby flux ropes (FRs). Aims. Because impact FR on space weather, we...
Recurrent, arc-shaped intensity disturbances were detected by EUV channels in an active region. The fronts observed to propagate along a coronal loop bundle rooted small area within sunspot umbra. Previous works have linked these slow magnetoacoustic waves that from the lower atmosphere corona magnetic field. at local cusp speed. However, measured propagation speeds images are usually smaller as they subject projection effects due inclination of field with respect line-of-sight. Here, we aim...
Generalising the Elsasser variables, we introduce Q-variables. These are more flexible than because they also allow to track waves with phase speeds different Alfven speed. We rewrite MHD equations these consider linearised version of resulting in a uniform plasma, and recover classical waves, but separate fast slow magnetosonic upward downward propagating waves. Moreover, show that Q-variables may surface non-uniform displaying power our generalisation. In end, lay mathematical framework...
ABSTRACT Slow waves are commonly observed on the entire solar atmosphere. Assuming a thin flux tube approximation, cut-off periods of slow-mode magneto-acoustic-gravity that travel from photosphere to corona were obtained in Costa et al. In paper, however, typo specific heat coefficient at constant pressure cp value led an inconsistency calculation, which is only significant transition region. Due abrupt temperature change region, mean atomic weight (by factor approximately 2) also occurs,...
Context. The Centaur (10199) Chariklo has the first ring system discovered around a small object. It was observed using stellar occultation in 2013. Stellar occultations allow sizes and shapes to be determined with kilometre accuracy, provide characteristics of occulting object its vicinity. Aims. Using between 2017 2020, our aim is constrain physical parameters rings. We also determine structure rings, obtain precise astrometrical positions Chariklo. Methods. predicted organised several...