A5034272283- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- GNSS positioning and interference
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Oceanographic and Atmospheric Processes
- Space Satellite Systems and Control
- Plasma Diagnostics and Applications
- Ocean Waves and Remote Sensing
- Spacecraft Design and Technology
- Advanced SAR Imaging Techniques
- Atomic and Subatomic Physics Research
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Cardiac Imaging and Diagnostics
- Seismic Waves and Analysis
- Space exploration and regulation
- Radar Systems and Signal Processing
- Magnetic Field Sensors Techniques
- Radio Astronomy Observations and Technology
- Magnetic confinement fusion research
- Methane Hydrates and Related Phenomena
University of Calgary
2016-2025
Libin Cardiovascular Institute of Alberta
2018-2022
John Wiley & Sons (United States)
2018
Charles River Laboratories (Netherlands)
2018
Astronomy and Space
2016
Craft Group (China)
1962-1963
Short and Associates (United States)
1962
Royal Aeronautical Society
1962
Marshalls (United Kingdom)
1962
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...
The presence of energetic O + ions in the ring current at onset a magnetic storm prompts question possible role “in‐transit” ionospheric between ionosphere and plasma sheet quiet periods immediately preceding main phase storm. Thermal‐energy are often observed time high‐altitude (>7000 km) polar on Akebono, temperatures ∼0.2–0.3 eV flow velocities few km/s. In this paper, we use single‐particle trajectory simulation to study transport these number large storms (Dst < −100 nT). Our...
A sampling of the environment around inert space objects has determined, which linear and nonlinear waves are created by moving debris all sizes. Plasma excited satellites through Earth's plasma in low earth orbit have been measured with situ electric field sensors on other satellites. These driven interest for proximity detection sources electrostatic electromagnetic noise spacecraft. Satellites near-earth ionosphere between 200 1000 km altitude become electrically charged both electron...
Abstract. CASSIOPE/e-POP, now known as Swarm-Echo, was launched in 2013 to study polar plasma outflow, neutral escape, and the effects of auroral currents on radio propagation ionosphere. The e-POP suite contains an array eight instruments, including two fluxgate magnetometers a shared boom. Until now, relied set preflight calibrations, which limited accuracy magnetic field product magnetometers' utility for some applications. Here we present results situ calibration performed data from 3...
Satellites try to avoid impacts by energetic particles that damage solar panels and electronic components.&#160; Whistler electromagnetic ion cyclotron (EMIC) waves can scatter trapped radiation into the atmospheric loss cone reduce particle fluxes.&#160;&#160;The proliferation rocket burns during satellite launches ISS reboost missions may populations of harmful radiation.&#160; Rocket exhaust artificially intensify low frequency (ELF/VLF) Exhaust Driven Amplification...
Strategies for C-H amination with sulfonamides have been dominated by stoichiometric strategies or Rh/Cu catalysis using strong oxidants, elevated temperatures, excess equivalents of partner. We developed a photocatalytic bench-stable N-methoxypyridinium salt that is amenable to late-stage functionalization efforts. discovered competitive proton-coupled electron transfer pathway between sulfonamide and pyridine byproduct inhibits the reaction. Catalysis was re-established introduction ZnBr2.
Heavy (O+) ion energization and field-aligned motion in near the ionosphere are still not well understood. Based on observations from CASSIOPE Enhanced Polar Outflow Probe (e-POP) at altitudes between 325 km 730 over one year, we present a statistical study (24 events) of heating its relation to bulk flow velocity, low-frequency waves currents (FACs). The temperature velocity derived 2-D distribution functions measured by suprathermal electron imager (SEI) instrument. Consistent...
The Suprathermal Electron Imager (SEI) on the Enhanced Polar Outflow Probe (e-POP) experiment uses a microchannel-plate-intensified charge-coupled device (CCD) detector to record two-dimensional, energy-angle images of electron distributions for energies up 350 eV. Alternatively, SEI can be biased measure positive ions at that include ambient ionospheric population (<1 eV) and extending At highest measurement resolution, distribution are 64 pixels in diameter read out rate 100 per second....
Abstract The CASSIOPE (also known as Swarm‐E) satellite crossed the path of totality August 2017 eclipse at ~640‐km altitude ~10 min following lunar umbra. Observations from CASSIOPE's Global Positioning System radio occultation receiver reveal total electron content variations 0.2–0.3 units in topside ionosphere—a signature medium‐scale (100‐200 km) plasma disturbances penumbra that were induced by eclipse. only observed during eclipse, their absence on preceding days being consistent with...
Abstract Whistler‐mode chorus waves are critical for driving resonant scattering and loss of radiation belt relativistic electrons into the atmosphere. The energies scattered by increase at increasingly higher magnetic latitudes. Propagation to middle high latitudes is hampered wave divergence Landau damping but promoted otherwise if ducted density irregularities. Although ducting theories have been proposed since 1960s, no conjugate observation propagation from equatorial magnetosphere...
The Fast Auroral Imager (FAI) consists of two charge-coupled device (CCD) cameras: one to measure the 630 nm emission atomic oxygen in aurora and enhanced night airglow; other observe prompt auroral emissions 650 1100 range. High sensitivity is realized through combination fast lens systems (f/0.8) CCDs high quantum efficiency (>90 % max). cameras have a common 26 degree field-of-view provide nighttime images about km diameter from apogee at 1500 km. near infrared camera provides up 0.1 s...
The imaging and rapid-scanning ion mass spectrometer (IRM) is part of the Enhanced Polar Outflow Probe (e-POP) instrument suite on Canadian CASSIOPE small satellite. Designed to measure composition detailed velocity distributions ions in ∼1–100 eV/q range a non-spinning spacecraft, IRM sensor consists planar entrance aperture, pair electrostatic deflectors, time-of-flight (TOF) gate, hemispherical analyzer, micro-channel plate (MCP) detector. TOF gate measures transit time each detected...
Abstract The first results from coordinated experiments between the Radio Receiver Instrument (RRI) on Enhanced Polar Outflow Probe (e‐POP) and Super Dual Auroral Radar Network (SuperDARN) Saskatoon high frequency (HF) radar are examined for a conjunction 8 July 2014. e‐POP, payload CAScade, Smallsat IOnospheric Explorer spacecraft, was located at 380 km altitude, approximately 10° north (geographic) 2° west of Saskatoon, Canada, moving in southeast direction. We use matched filter technique...
Abstract For the first time, near infrared (NIR) auroral emissions measured from space have been compared with E‐region coherent scatter. The scatter observations were obtained by 49.5 MHz Ionospheric Continuous‐wave Bistatic Experimental Auroral Radar (ICEBEAR) in western Canada. NIR integrated over 650–1,100 nm wavelengths Fast Imager instrument onboard e‐POP on CASSIOPE (now Swarm‐E) a 1 s temporal resolution (same as ICEBEAR), slewed to center of ICEBEAR field‐of‐view. echoes and are...
Abstract We have developed a model that simulates the Poynting flux profile of Saskatoon Super Dual Auroral Radar Network (SuperDARN) radar at ionospheric altitudes. The uses ray tracing software to project system's vacuum through ionosphere, taking into account influence medium on propagation characteristics high frequency radio waves. Measurements radar's transmissions by Radio Receiver Instrument (RRI) in low‐Earth orbit are used validate during five experiments which occurred between 4...
Ground-based very low frequency (VLF) transmitters located around the world generate signals that leak through bottom side of ionosphere in form whistler mode waves. Wave and particle measurements on satellites have observed these man-made VLF waves can be strong enough to scatter trapped energetic electrons into pitch angle orbits, causing loss by absorption lower atmosphere. This precipitation process is greatly enhanced intentional amplification using a newly discovered called rocket...
Abstract We report the results of a radio science experiment involving citizen scientists conducted on 28 June 2015, in which Radio Receiver Instrument (RRI) Enhanced Polar Outflow Probe (e‐POP) tuned to 40‐ and 80‐m ham bands during 2015 American Relay League Field Day. have aurally decoded Morse coded call signs 14 hams (amateur operators) from RRI's data help ascertain their locations experiment. Through careful analysis hams' transmissions, with aid ray tracing tools, we identified two...
Abstract We present in situ ion composition and velocity measurements during the August 2017 solar eclipse from Enhanced Polar Outflow Probe (e‐POP), which crossed path of totality at ~640‐km altitude within 10 min passing. These reveal two distinct H + populations, an ~40% decrease topside plasma density, a similar drop upward but not downward flux, O ~100 m/s. features are directly linked to changes /O interhemispheric or field‐aligned light flow reduction negative spacecraft potential....
Abstract We investigate low‐energy (<10 eV) ion upflows (mainly O + ) within the cleft fountain (CIF) using conjunctions of Enhanced Polar Outflow Probe (e‐POP) satellite, DMSP F16 SuperDARN radar, and Resolute Bay Incoherent Scatter Radar North (RISR‐N). The SEI instrument on board e‐POP enables us to derive upflow velocities from 2‐D images distribution functions with a frame rate 100 per second, velocity resolution order 25 m/s. identify three events very intense (>1.6 km/s) near...
Abstract We present the design and principle of operation imaging ion mass velocity analyzer on Enhanced Polar Outflow Probe (e‐POP), which measures low‐energy (1–90 eV/e) composition (1–40 AMU/e) distributions using a hemispherical electrostatic (HEA), time‐of‐flight (TOF) gate, pair toroidal deflectors (TED). The HEA TOF gate measure energy‐per‐charge azimuth each detected transit time inside analyzer, respectively, providing 2‐D distribution major ionospheric species resolving minor under...
Abstract The first demonstration of rocket exhaust driven amplification (REDA) whistler mode waves occurred on May 26, 2020 by transferring energy from pickup ions in a plume to EM waves. source coherent VLF was the Navy NML Transmitter at 25.2 kHz located LaMoure, North Dakota. topside ionosphere 480 km altitude became an amplifying medium with 60 s firing Cygnus BT‐4 engine. engine injected as neutral cloud moving perpendicular field lines that connected transmitter Radio Receiver...