A5024028948- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Complex Systems and Time Series Analysis
- Theoretical and Computational Physics
- Traffic control and management
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Lightning and Electromagnetic Phenomena
- Complex Network Analysis Techniques
- Transportation Planning and Optimization
- Evacuation and Crowd Dynamics
- Advanced Chemical Physics Studies
- Dust and Plasma Wave Phenomena
- Astro and Planetary Science
- Laser-induced spectroscopy and plasma
- nanoparticles nucleation surface interactions
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Quantum, superfluid, helium dynamics
- Geophysics and Gravity Measurements
- Opinion Dynamics and Social Influence
- Nonlinear Dynamics and Pattern Formation
- Magnetic confinement fusion research
Worcester Polytechnic Institute
2025
University of Chile
2015-2024
Millennium Initiative for Collaborative Research on Bacterial Resistance
2014-2024
Universidad de Santiago de Chile
2002-2022
Universidad Bernardo O'Higgins
2022
Institut Català de Nanociència i Nanotecnologia
2021
Honeywell (United States)
2019
Fundación Chile
2015-2018
Centro de Investigación y Desarrollo
2018
Universidad de Los Andes
2004-2016
Evidence is presented that suggests there a significant self‐organized criticality (SOC) component in the dynamics of substorms magnetosphere. We assume observations bursty bulk flows, fast localized dipolarizations, plasma turbulence, etc. show multiple reconnection sites provide basic avalanche phenomenon establishment SOC sheet. First results are from study this process based on working assumption. A magnetic field reversal model discussed. Resistivity, model, self‐consistently generated...
We introduce a microscopic traffic model, based on kinematic behavior, which consists of single vehicle traveling through sequence lights that turn and off with specific frequency. The reconstructed function maps the state from light to displays complex behavior for certain conditions. This chaotic arises by discontinuous nature map, an essential ingredient in patterns could be relevance studying situations.
The strong correlation between magnetic storms and southward interplanetary field (IMF) is well known from linear prediction filter studies using the Dst IMF data. However, filters change significantly one storm to another thus are limited in their predicting ability. Previous have indicated nonlinearity magnetospheric response as ring current decay rate varies with value during storms. We present this letter nonlinear models for evolution of based on OMNI database 1964–1990. When solar wind...
The complex behavior that occurs when traffic lights are synchronized is studied. Two strategies considered: all in phase, and a "green wave" with propagating green signal. It found variables such as traveling time, velocity, fuel consumption, near resonance, follow critical scaling laws. For the wave, it shown time velocity laws hold even for random separation between lights. These results suggest concept of transient resonances, which can be induced by adaptively changing phase This may...
Based on the one-body particle-antiparticle Dirac theory of electrons, a set relativistic quantum fluid equations for spin half plasma is derived. The nature particles explicit in this theory, which also includes effects such as spin. nonrelativistic limit shown to be agreement with previous attempts develop derived from Pauli Hamiltonian. Harnessing formalism study electromagnetic mode propagation, conceptually new phenomena are revealed; increase opacity these waves, while tend make more...
Abstract Observed electron velocity distributions in the Earth's magnetosphere and solar wind exhibit a variety of nonthermal features which deviate from thermal equilibrium, for example, form temperature anisotropies, suprathermal tail extensions, field‐aligned beams. The state close to equilibrium its departure it provides source spontaneous emissions electromagnetic fluctuations, such as whistler. Here we present comparative analysis whistler‐cyclotron firehose fluctuations based upon...
We present solutions for Hall equilibria applicable to neutron star crusts. Such magnetic configurations satisfy a Grad-Shafranov-type equation, which is solved analytically and numerically. The presented cover variety of configurations, from purely poloidal fields connected an external dipole poloidal-toroidal vacuum field, or fully confined within the star. find that field should be supported by uniformly rotating electron fluid. energy toroidal generally found few percent total with...
The behavior of substorms as sudden transitions the magnetosphere is studied using Bargatze et al. [1985] data set solar wind induced electric field vB s and auroral electrojet index AL . divided into three subsets representing different levels activity, they are singular spectrum analysis. points evolution in subspace eigenvectors corresponding to largest eigenvalues can be approximated by two‐dimensional manifolds with a relative deviation 10–20%. For first two small medium activity have...
In stably stratified stars, numerical magneto-hydrodynamics simulations have shown that arbitrary initial magnetic fields evolve into stable equilibrium configurations, usually containing nearly axisymmetric, linked poloidal and toroidal stabilize each other. this work, we test the hypothesis stratification is a requirement for existence of such equilibria. For purpose, follow numerically evolution in barotropic (and thus neutrally stable) starting from two different types conditions, namely...
This work seeks to better characterize the radiant heat transfer sample in cone calorimeter, a widely used fire testing apparatus. Specifically, spatial uniformity of flux from heater and sensor are investigated with analytical view factor models based on idealized geometry element (tapered helical coil) experimental measurements. The factors calculated contours relevant geometries employing Stokes' theorem contour integrated numerically. An uncertainty analysis is performed theoretical...
A new and improved model of red sprites is presented. Emphasis placed in accounting for the puzzling observation spatial structure sprite's optical emissions. The relies upon a horizontal fractal lightning discharge, which generates EMPs that excites emissions lower ionosphere. It shown may account observed spatially structured pattern, while reducing typical charge threshold to approximately 100 C.
The lowest-energy structures of small Pd clusters $(2\ensuremath{\leqslant}N\ensuremath{\leqslant}13)$ are computed by means available phenomenological many-body potentials and ab initio methods. configuration is found a genetic algorithm search. Satisfactory agreement between the results several methods implemented achieved. Of special interest fact that all yield same symmetry group for cluster geometries, which moreover identical with results. This constitutes an indication most common...
[1] During the last decade, a number of studies have shown that turbulent processes in plasma sheet are very important for analysis formation quasi-stable configurations. The existence this turbulence provides self-consistent approach to study dynamics Earth's magnetosphere, including stability. can also be an understanding location isolated substorm expansion phase onset. In level has been evaluated by calculating eddy diffusion coefficients using Time History Events and Macroscale...
Abstract We use kappa distributions to model thousands of ion and electron flux spectra along the plasma sheet analyze variation spectral index κ temperature T in this region. find that are ubiquitous fit well during quiet times, expansion recovery phases substorms. Near Earth, up ∼12 R E , indices different than rest sheet, both for ions ( i ) electrons e ). There is a significant dawn‐dusk asymmetry toward tail, which enhanced The also exhibit permanent asymmetry, determined by colder...
As another step towards understanding the long-term evolution of magnetic field in neutron stars, we provide first simulations ambipolar diffusion a spherical star. Restricting ourselves to axial symmetry, consider charged-particle fluid protons and electrons carrying flux through motionless, uniform background neutrons that exerts collisional drag force on former. We also ignore possible impact beta decays, proton superconductivity, superfluidity. All initial configurations considered are...
ABSTRACT Long-lived magnetic fields are known to exist in upper main-sequence stars, white dwarfs, and neutron stars. In order explore possible equilibrium configurations of the field inside these we have performed 3D magnetohydrodynamic simulations evolution initially random stably stratified barotropic stars with an ideal-gas equation state using pencil code, a high-order finite-difference code for compressible hydrodynamic flows presence fields. (isentropic) confirm previous results sense...
Aims. This paper is the first in a series that aims to understand long-term evolution of neutron star magnetic fields.