A5083659523- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
- Solar and Space Plasma Dynamics
- Inertial Sensor and Navigation
- Scientific Research and Discoveries
- Space Exploration and Technology
- Ionosphere and magnetosphere dynamics
- Space Satellite Systems and Control
- Spacecraft and Cryogenic Technologies
- Spacecraft Design and Technology
- Space Science and Extraterrestrial Life
- Stellar, planetary, and galactic studies
- GNSS positioning and interference
- Marine and environmental studies
- Spacecraft Dynamics and Control
- High-pressure geophysics and materials
- Geophysics and Sensor Technology
- Law, logistics, and international trade
- Numerical methods in inverse problems
- Gender Diversity and Inequality
- Gender Roles and Identity Studies
- Advanced Numerical Methods in Computational Mathematics
- Computational Physics and Python Applications
University of California, San Diego
2024
University of Arizona
2020-2023
Planetary Science Institute
2020-2021
Royal Observatory of Belgium
2008-2020
Enceladus is characterised by a south polar hot spot associated with large outflow of heat, the source which remains unclear. We compute viscous dissipation resulting from tidal and libration forcing in moon's subsurface ocean using linearised Navier-Stokes equation 3-dimensional spherical model. conclude that dominant cause at linear order, providing up to about 0.001 GW heat ocean, insufficient explain (about) 10 observed Cassini. also illustrate how resonances inertial modes can...
Abstract The outer solar system beyond Saturn remains unexplored by dedicated orbital missions. With a launch window opening in 2029, the Uranus Orbiter and Probe (UOP) mission has been prioritized as NASA Flagship for next decade (2023–2032) to comprehensively study its major moons—Miranda, Ariel, Umbriel, Titania, Oberon. We define apply novel design principles centered on scientific objectives UOP's gravity science (GS) experiment. Using combination of Bayesian Precise Orbit Determination...
In this review paper, we examine the changes in Earth orientation space and focus on nutation (shorter-term periodic variations), which is superimposed precession (long-term trend a timescale of years). We modelling involving several coupling mechanisms at core-mantle boundary using Liouville angular momentum equations for two-layered with liquid flattened core. The classical approach considers Poincaré fluid core an inertial pressure mechanism boundary. possible additional to explain...
The Earth is a rapidly rotating body. centrifugal pull makes its shape resemble flattened ellipsoid and Coriolis forces support waves in fluid core, known as inertial waves. These can lead to global oscillations, or modes, of the fluid. Periodic variations Earth's rotation axis (nutations) an exchange angular momentum between mantle core excite these modes. In addition viscous torques that exist regardless boundaries, small flattening core-mantle boundary (CMB) allows modes exert pressure on...
Abstract We compute the inertial modes of a freely rotating two-layer planetary model with an ellipsoidal inviscid fluid core and perfectly rigid mantle. present method to derive analytical formulae for frequencies free nutation (FCN) Chandler wobble (CW) that are valid all orders dynamical flattening mantle, we show how FCN CW direct generalization purely spin-over mode Eulerian case where mantle can oscillate around state steady rotation. Through numerical computation axisymmetric (oblate...
The cause for the damping of Earth's free core nutation (FCN) and inner eigenmodes has been a matter debate since earliest reliable estimations from observations were made available. Numerical studies are difficult given extreme values some parameters associated with fluid outer core, where important energy dissipation mechanisms can take place. We present fully 3D numerical model FCN capable describing accurately viscous Ohmic processes taking place in bulk as well boundary layers. find an...
We propose a numerical method to compute the inertial modes of container with near-spherical geometry based on fully spectral discretisation angular and radial directions using spherical harmonics Gegenbauer polynomial expansion respectively. This allows solve simultaneously Poincare equation no penetration condition as an algebraic eigenvalue problem. The exact oblate spheroid are recovered machine precision appropriate set spheroidal coordinates. show how other boundaries that deviate...
Knowledge of the interior structure terrestrial planets can be achieved by studying changes their rotation and orientation in time. We simulate use time deviations altimetry crossover positions to infer information on nutations Mars librations Mercury. The analysis is based least squares estimator uses simulated points. simulations demonstrate that data improves estimates observed libration amplitude obliquity Mercury allows detecting Mars.
This study characterizes how sex and gender data have been collected, analyzed, described in papers published CBE-LSE over a five year period. Findings demonstrate the prevalence of cisnormative language methodologies biology education research. Suggestions are given for being more inclusive trans* identities future work.
First principles of electromagnetism impose that the tangential electric field must be continuous at interface between two media. The definition depends on frame reference leading to an ambiguity in mathematical expression continuity condition when sides do not share same rest frame. We briefly review arguments supporting each choice and illustrate how most theoretically consistant leads a paradox induction experiments. then present model sliding contact solids fluid solid, show this can...
Io is a priority destination for solar system exploration, as it the best natural laboratory to study intertwined processes of tidal heating, extreme volcanism, and atmospheremagnetosphere interactions.Io exploration relevant understanding terrestrial planets moons (including early Earth), ocean worlds, exoplanets across cosmos.1. future exploration.Jupiter's innermost large moon, Io, most geologically active world in (Fig. 1).Io's surface marked by hundreds volcanoes, erupting lava...
Almost all the planets of our solar system have moons. Each planetary has however unique characteristics. The Martian not one single big moon like Earth, tens moons various sizes for giant planets, but two small moons: Phobos and Deimos. How did form such a system? This question is still being investigated on basis Earth-based space-borne observations more modern theories proposed to account formation other systems. most recent scenario relies impact occurring at early Mars history having...
Inertial modes are global oscillations that take place inside rotating objects, such as stars and planets with a fluid core and/or liquid ocean, which result from the restoring effect of Coriolis force. Experimental studies in laboratory have shown these can be excited by action tidal deformation at boundary well precession rotation axis. However, influence inertial on remains unclear. As frequencies contained within band -2
Io is a priority destination for solar system exploration, as it the best natural laboratory to study intertwined processes of tidal heating, extreme volcanism, and atmospheremagnetosphere interactions.Io exploration relevant understanding terrestrial planets moons (including early Earth), ocean worlds, exoplanets across cosmos.The scope importance science questions at necessitates broad portfolio research analysis, telescopic observations, planetary missions-including dedicated New...