A5030199784- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- GNSS positioning and interference
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Radio Astronomy Observations and Technology
- Dust and Plasma Wave Phenomena
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Methane Hydrates and Related Phenomena
- Planetary Science and Exploration
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Underwater Vehicles and Communication Systems
- Advanced Frequency and Time Standards
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Laser Design and Applications
- Underwater Acoustics Research
- Radio Wave Propagation Studies
- Oceanographic and Atmospheric Processes
- Advanced SAR Imaging Techniques
Skanska (United Kingdom)
2023
Costain (United Kingdom)
2023
University of Calgary
2009-2022
Imperial College Healthcare NHS Trust
2022
Natural Resources Canada
2017-2020
Communications Research Centre Canada
2004-2013
Innovation, Science and Economic Development Canada
2002-2005
Clear Creek Baptist Bible College
1983-1987
University of British Columbia
1965
Data from the VLF receivers aboard Alouette and Isis spacecraft contain a number of examples ‘saucer’ radio phenomenon, so named because its hyperbolic shape in amplitude-frequency-time displays. These have been interpreted terms model involving small source emission. Frequency-time signatures calculated by using ray-tracing program assuming that appropriate dispersion curves are those whistler mode on resonance cone surface. Spatial dimensions sources deduced: typically, these 0.5 km...
The Enhanced Polar Outflow Probe (e-POP) on the polar-orbiting CASSIOPE small satellite (325×1500 km, 80° inclination) is a suite of 8 plasma instruments, including imaging and neutral particle sensors, magnetometers, dual-frequency Global Positioning System (GPS) receivers, charge coupled-device (CCD) cameras, radio wave receiver beacon transmitter. scientific objective e-POP to make observations mesoscale microscale processes in topside high-latitude ionosphere at highest-possible...
Simultaneous measurements from the Isis 1 satellite of soft-electron fluxes and auroral hiss at low medium frequencies indicate that such noise emissions can propagate to north or south L shell containing precipitating electrons through distances up 1000 km about 3° invariant latitude 2000 altitude. This latitudinal spreading suggests propagation corresponds those parts whistler-mode dispersion curves where waves are electric, is, near resonance cone. The relative variations LF MF spectra be...
VLF/ELF electric field wave data acquired on the ISIS 1, 2, and ISEE 1 satellites demonstrate existence of a new phenomenon in which initially narrowband (∼1 Hz) upgoing signals from ground‐based VLF transmitters undergo significant spectral broadening as they propagate through ionosphere protonosphere up to altitudes range 600–3800 km. For transmitter 10–20 kHz, can be high 10% nominal frequency input signal. Spectral occurs only presence impulsive hiss and/or lower hybrid resonance (LHR)...
The Radio Receiver Instrument (RRI) is a four-channel digital receiver fed by four 3-metre monopoles, arranged in crossed configuration, each connected to high input impedance preamplifier. RRI bandwidth extends from 10 Hz 18 MHz. measures the electric fields of either spontaneous radio emissions or waves created ground transmitters, such as ionosondes, high-frequency radars and ionospheric heaters. In order measure accurately intensity, frequency, direction propagation signal delay over...
Radio waves at frequencies between 525 and 5850 Hz were observed simultaneously on the ground in VLF receiver of ISIS 1 spacecraft during a flight over Max‐Planck‐Institut für Aeronomie ionospheric heater near Tromsø, Norway, December 9, 1981. The carrier frequency, 4.04 MHz, was amplitude modulated with set four frequencies: 525, 1725, 2925, 4125 Hz. satellite detected all these fundamental plus harmonics 2925 components, caused by nonsinusoidal modulation carrier. Characteristics signal...
The spin‐modulated noise from the dipole connected to sounder receiver on Isis 1 spacecraft has been used along with computation of ray paths deduce direction propagation auroral kilometric radiation (AKR). On basis three passes fixed‐frequency measurements at 0.48 MHz it is concluded that in generation region about 3500‐km altitude wave vectors make an angle between 60° and 90° respect local magnetic field. That is, they are predominantly downcoming. Also, using records plasma frequency f N...
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 soft‐particle spectrometers aboard the spacecrafts ISIS I and II detect sounder‐accelerated particles, i.e., fluxes of electrons ions energized by 100‐μs transmitter pulse (nominal peak power: 400 W). Fluxes up to 10 8 st −1 eV cm −2 s are observed. Typical highest electron ion energies several hundred electronvolts 100–200 eV, respectively. Sounder‐accelerated detected on near major resonant frequencies: ƒ pe (plasma frequency), ce (gyrofrequency), 2ƒ oblique resonance frequency...
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...
Radio waves at frequencies between 1525 and 5925 Hz were observed on the DE 1 satellite during a pass over Heating facility of Max‐Planck‐Institut für Aeronomie (MPAe Heating) near Tromsø, Norway. The detected 2‐min period December 12, 1981, measurements indicated pulse stretching by few hundred milliseconds spectral broadening about 10 Hz. Measured signal delays are compared with those calculated using three‐dimensional ray tracing. distortion not consistent that expected basis propagation...
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...
An experiment on transionospheric HF propagation was carried out in 1978 using a dedicated ground transmitter at Ottawa and the sounder receivers of ISIS 1 2 spacecraft. This paper deals with resulting data from 1400 km altitude. Fade frequencies one to few hertz 9.303‐MHz fixed‐frequency carrier signals were measured found be confined satellite locations between about 3° 20° equatorward transmitter. The majority fades Faraday type, involving ordinary ( O ) extraordinary X wave components....
Abstract. The Cascade Demonstrator Small-Sat and Ionospheric Polar Explorer (CASSIOPE) satellite is scheduled to be launched in 2010. On board this will a suite of eight scientific instruments comprising the enhanced Outflow Probe (ePOP). One instrument Radio Receiver Instrument (RRI) which used receive HF transmissions from various ground transmitters such as Super Dual Auroral Radar Network (SuperDARN) array. Magnetoionic polarization propagation theory have been model relative power that...
Abstract Throughout a nighttime pass of the CASSIOPE satellite at an altitude about 1300 km above Sura heating facility, transmission O‐mode radiation from to enhanced Polar Outflow Probe (e‐POP) Radio Receiver Instrument on was maintained. Also, during this pass, continuous VHF/UHF e‐POP Coherent Electromagnetic Tomography radio beacon three coordinated ground receivers in vicinity achieved. received wave data based total electron content permitted two‐dimensional distribution ionospheric...
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...
The observations in the OEDIPUS‐C experiment of bistatic propagation along lower oblique resonance cone between a separated transmitter and receiver ionosphere are explained through detailed calculations radiated field V‐dipole antenna used by novel theory receiving under conditions. Unexpectedly high values 25 kHz signal observed at its structure agree well with transmission exciter receiver, when layout dispersive properties plasma taken into account.
Intersatellite radio wave propagation in the lower‐frequency branch of extraordinary mode, or Z has been studied using data recorded by Isis I and II topside sounder spacecraft during a rendezvous near north pole. The working frequencies, 1.0 MHz, lay between gyrofrequency upper hybrid resonance frequency, former being greater than plasma frequency. In contrast to 100‐µs length emitted pulses, received pulses were stretched about 10 ms had sharp rising edges. At any given time range...
An HF transmitter was operated at one end of the tethered sounding rocket payload OEDIPUS C, and a synchronized receiver other end. Both were connected to dipoles. On flight downleg after tether had been cut, direct bistatic propagation experiments carried out with transmitter‐receiver pair. During flight, sharp minima which can be attributed interference fringes detected in directly transmitted signal. Fringe frequencies observed on C ionograms for four different schemes have examined using...