A5005932424- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- Seismology and Earthquake Studies
- Seismic Waves and Analysis
- GNSS positioning and interference
- Geophysics and Sensor Technology
- Magnetic Field Sensors Techniques
- Astro and Planetary Science
- Oceanographic and Atmospheric Processes
- Ocean Waves and Remote Sensing
- Planetary Science and Exploration
- Advanced Decision-Making Techniques
- Atmospheric and Environmental Gas Dynamics
- Underwater Acoustics Research
- Safety and Risk Management
- Inertial Sensor and Navigation
- Laser-induced spectroscopy and plasma
- Spectroscopy and Chemometric Analyses
- Geological Modeling and Analysis
- Spacecraft Design and Technology
- Complex Systems and Time Series Analysis
- Radioactivity and Radon Measurements
- Neural Networks and Applications
University of Calgary
2021-2024
University of Alberta
2016-2024
Charles River Laboratories (Netherlands)
2018
John Wiley & Sons (United States)
2018
University of Sheffield
2013-2014
Abstract Terrestrial space weather involves the transfer of energy and momentum from solar wind into geospace. Despite recently discovered seasonal asymmetries between auroral forms intensity emissions northern southern hemispheres, seasonally averaged input ionosphere is still generally considered to be symmetric. Here we show, using Swarm satellite data, a preference for electromagnetic at 450 km altitude hemisphere, on both dayside nightside, when over season. We propose that this...
Abstract Difficulty in making low noise magnetic measurements is a significant challenge to the use of cube‐satellite (CubeSat) platforms for scientific constellation class missions study magnetosphere. Sufficient resolution required resolve three‐dimensional spatiotemporal structures field variations accompanying both waves and current systems nonuniform plasmas controlling dynamic magnetosphere‐ionosphere coupling. This paper describes design, validation, test flight‐ready, miniature,...
Abstract High‐resolution multispacecraft Swarm data are used to examine magnetosphere‐ionosphere coupling during a period of northward interplanetary magnetic field (IMF) on 31 May 2014. The observations reveal prevalence unexpectedly large amplitude (>100 nT) and time‐varying perturbations the polar passes, with especially being associated large‐scale downward field‐aligned currents. Differences between measurements sampled at 50 Hz from A C, approximately 10 s apart along track,...
Abstract The electrodynamics associated with dual discrete arc aurora antiparallel flow along the arcs were observed nearly simultaneously by enhanced Polar Outflow Probe (e‐POP) and Swarm A C spacecraft. Auroral imaging from e‐POP reveals 1–10 km structuring of arcs, which move evolve on second timescales confound traditional single‐spacecraft field‐aligned current algorithms. High‐cadence magnetic data show Hz, inferred Alfvénic, perturbations coincident at same scale size as dynamic...
Abstract Underestimation of the transfer energy between magnetosphere and ionosphere, Poynting flux, is a persistent issue in space weather studies high‐latitude ionospheric models. Thought to be due inability resolve small‐scale fluctuations electric field, this underestimation could lead significant further underestimations parameters such as thermospheric mass density consequential satellite drag. Utilizing 16 Hz ion velocity magnetic field measurements from Swarm mission, we examine...
Abstract In situ conjugate electromagnetic ion cyclotron (EMIC) waves observed by the Swarm mission in both hemispheres are presented. A complex and unusual pattern of Alfvénic EMIC wave energy is observed, with a mid‐latitude peak close to source at L =3.3, as well secondary lower ‐peak. propagation model reveals that =1.7 may be explained power being redirected equatorward due Buchsbaum resonance, crossing interfering same propagating equatorwards from opposite hemisphere. This...
Abstract Field‐aligned currents (FACs) are a fundamental component of coupled solar wind‐magnetosphere‐ionosphere. By assuming that FACs can be approximated by stationary infinite current sheets do not change on the spacecraft crossing time, single‐spacecraft magnetic field measurements used to estimate flowing in space. combining data from multiple similar orbits, these stationarity assumptions tested. In this technical report, we present new technique combines cross correlation and linear...
This study presents a fusion of data-driven and physics-driven methodologies energetic electron flux forecasting in the outer radiation belt. Data-driven NARMAX (Nonlinear AutoRegressive Moving Averages with eXogenous inputs) model predictions for geosynchronous orbit fluxes have been used as an boundary condition to drive physics-based Versatile Electron Radiation Belt (VERB) code, simulate belt environment. The coupled system has tested three extended time periods totalling several weeks...
Abstract Field‐aligned currents (FACs) are a primary signature of magnetosphere‐ionosphere coupling (MIC). However, establishing FACs requires the propagation Alfvén waves. Large‐scale quasi‐static well‐organized into large‐scale Region 1 (R1) and 2 (R2) systems during intervals southward interplanetary magnetic field (IMF); however, scale‐dependent spatiotemporal variability related electrodynamics less well understood. Using electric data from Swarms A C, we examine role waves in MIC at...
Abstract Current methods for estimating ion density on Swarm rely the assumption of 100% O + and no along-track velocity flows. These assumptions are routinely violated, particularly nightside during high-latitude polar cap traversals, compromising accuracy measurements. The use faceplate current data along with Langmuir probe admittance measurements, orbital-motion limited (OML) theory, make it possible to relax some inherent in ESA estimates. This further yields drift effective mass paper...
Abstract. Multi-point wave observations on Cluster spacecraft are used to infer the dispersion relation of electromagnetic ion cyclotron (EMIC) waves. In this study we use a phase differencing method and from STAFF WHISPER during well-studied event 30 March 2002. The requires knowledge direction vector, which was obtained using minimum variance analysis. Wave vector amplitudes were calculated for number frequencies experimentally. is largely consistent with cold plasma relation. presented...
Abstract Storm-time topside ionosphere plasma composition, especially the light ion fraction, is an important parameter which controls magnetosphere–ionosphere coupling, plays a part in growth of local instabilities, and provides information about ring current, upflow, movement ionization other physical processes parameters. Ion composition difficult to estimate on fine scales as empirical models tend be parametrized by fixed inputs, ignoring role memory plasma, preferentially capture large...
Terrestrial space weather involves the transfer of energy and momentum from solar wind into geospace. Despite recently discovered seasonal asymmetries between auroral forms intensity emissions northern southern hemispheres, seasonally averaged input ionosphere is still generally considered to be symmetric. Here we use Swarm satellite data show an unexpected preference for electromagnetic at 450 km altitude hemisphere, on both dayside nightside, when over season. We propose that this...
Underestimation of the transfer energy between magnetosphere and ionosphere, Poynting flux, is a persistent issue in space weather studies high-latitude ionospheric models. Thought to be due inability resolve small-scale fluctuations electric field, this underestimation could lead significant further underestimations parameters such as thermospheric mass density consequential satellite drag. Utilising 16Hz ion velocity magnetic field measurements from Swarm mission, we examine observed flux...
Abstract In the scientific field of collisionless shocks, interplanetary space comprises a critical natural laboratory allowing study processes at spatial scales which are impossible to recreate in laboratories on Earth. Despite decades research, key questions dynamics shocks including energy transport and exchange remain unresolved due instrumental limitations. With return humanity Moon upcoming construction Lunar Platform: Gateway (LOP‐G) station, possibility arises pristine solar wind...
<p>The outer belt electron radiation is highly dynamic, responding to a superposition of variety acceleration and loss processes imposed along the drift orbits produce increases decreases in flux on timescales from minutes, hours, days years. These trapped relativistic so-called ‘satellite killer’ electrons can penetrate spacecraft shielding cause damage internal electronics single-event upsets. Understanding predicting environment, therefore,...