Ian Schofield
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View article: Simultaneous ground-satellite observations of ELF/VLF emissions generated by a strong magnetospheric compression
Simultaneous ground-satellite observations of ELF/VLF emissions generated by a strong magnetospheric compression Open
We report, for the first time, simultaneous nightside observations of very low frequency waves associated with a strong sudden impulse and subsequent magnetospheric compression. On 23 December 2014 at 11:15 UT we observed an intense sudden…
View article: Whole-body fasciculation detection in amyotrophic lateral sclerosis using motor unit MRI
Whole-body fasciculation detection in amyotrophic lateral sclerosis using motor unit MRI Open
MUMRI has potential as diagnostic tool for ALS.
View article: Motor Unit Magnetic Resonance Imaging (<scp>MUMRI</scp>) In Skeletal Muscle
Motor Unit Magnetic Resonance Imaging (<span>MUMRI</span>) In Skeletal Muscle Open
Magnetic resonance imaging (MRI) is routinely used in the musculoskeletal system to measure skeletal muscle structure and pathology in health and disease. Recently, it has been shown that MRI also has promise for detecting the functional c…
View article: Gastric pH changes during post‐operative ileus in horses
Gastric pH changes during post‐operative ileus in horses Open
Background: Riding racehorses is a high-risk profession and optimising safety alongside performance is paramount.Horseshoes play a critical role in providing traction with the ground surface and therefore contribute to safety. Objective: T…
View article: <scp>Ultrasound‐guided</scp> motor unit scanning electromyography
<span>Ultrasound‐guided</span> motor unit scanning electromyography Open
Introduction/Aims Measuring the spatial dimensions of a single motor unit remains a challenging problem, and current techniques, such as scanning electromyography (EMG), tend to underestimate the true dimensions. In this study we aimed to …
View article: Interfacing Motor Units in Nonhuman Primates Identifies a Principal Neural Component for Force Control Constrained by the Size Principle
Interfacing Motor Units in Nonhuman Primates Identifies a Principal Neural Component for Force Control Constrained by the Size Principle Open
Motor units convert the last neural code of movement into muscle forces. The classic view of motor unit control is that the CNS sends common synaptic inputs to motoneuron pools and that motoneurons respond in an orderly fashion dictated by…
View article: In vivo 3D imaging of human motor units in upper and lower limb muscles
In vivo 3D imaging of human motor units in upper and lower limb muscles Open
MUMRI provides the first in-vivo 2D images of upper limb motor units and 3D images of lower leg motor units. 3D imaging suggest a more complex human motor unit structure than previously thought.
View article: Electrical cross-sectional imaging of human motor units in vivo
Electrical cross-sectional imaging of human motor units in vivo Open
As well as providing insights into normal human motor physiology, this technology could lead to faster and more accurate diagnosis in patients with neuromuscular diseases.
View article: Interfacing Spinal Motor Units in Non-Human Primates Identifies a Principal Neural Component for Force Control Constrained by the Size Principle
Interfacing Spinal Motor Units in Non-Human Primates Identifies a Principal Neural Component for Force Control Constrained by the Size Principle Open
Motor units convert the last neural code of movement into muscle forces. The classic view of motor unit control is that the central nervous system sends common synaptic inputs to motoneuron pools and that motoneurons respond in an orderly …
View article: What caused the frequent and widespread occurrences of noctilucent clouds at middle latitudes in 2020?
What caused the frequent and widespread occurrences of noctilucent clouds at middle latitudes in 2020? Open
The 2020 summer season has revealed frequent occurrences of noctilucent clouds (NLCs) around the Northern hemisphere at middle latitudes (45–55° N), with the lowest latitude at which NLCs were seen being 34.1° N. In order to investigate a …
View article: The muscle twitch profile assessed with motor unit magnetic resonance imaging
The muscle twitch profile assessed with motor unit magnetic resonance imaging Open
Localised signal voids in diffusion‐weighted (DW) images of skeletal muscle have been postulated to occur as a result of muscle fibre contraction and relaxation. We investigated the contrast mechanism of these signal voids using a combinat…
View article: Lumbar disc disease: the effect of inversion on clinical symptoms and a comparison of the rate of surgery after inversion therapy with the rate of surgery in neurosurgery controls
Lumbar disc disease: the effect of inversion on clinical symptoms and a comparison of the rate of surgery after inversion therapy with the rate of surgery in neurosurgery controls Open
[Purpose] We have previously shown inversion therapy to be effective in a small prospective randomised controlled trial of patients with lumbar disc protrusions. Our purpose now was to measure symptoms and to compare the surgery rate follo…
View article: Wavenumber Spectra of Atmospheric Gravity Waves and Medium‐Scale Traveling Ionospheric Disturbances Based on More Than 10‐Year Airglow Images in Japan, Russia, and Canada
Wavenumber Spectra of Atmospheric Gravity Waves and Medium‐Scale Traveling Ionospheric Disturbances Based on More Than 10‐Year Airglow Images in Japan, Russia, and Canada Open
We have studied atmospheric gravity waves (AGWs) and nighttime medium‐scale traveling ionospheric disturbances (MSTIDs) by applying three‐dimensional spectral analysis technique to 557.7‐ and 630.0‐nm airglow images at Shigaraki (SGK) (35°…
View article: Scanning the Auroral Skies: The Athabasca University Robotic Telescope
Scanning the Auroral Skies: The Athabasca University Robotic Telescope Open
The Athabasca University Robotic Telescope (AURT) is a moderate aperture (0.36 m) networked robotic telescope that supports teaching and research at Athabasca University, a pioneering and prominent distance learning university in Canada. T…
View article: Three Decades of Distance Education Astronomy at Athabasca University
Three Decades of Distance Education Astronomy at Athabasca University Open
The first Astronomy course at Athabasca University was offered in 1989 as a correspondence course, using innovative DOS software on the remote students’ home computers. A Sciencestream course, it simulated astronomy research and offered la…
View article: Three‐Dimensional Fourier Analysis of the Phase Velocity Distributions of Mesospheric and Ionospheric Waves Based on Airglow Images Collected Over 10 Years: Comparison of Magadan, Russia, and Athabasca, Canada
Three‐Dimensional Fourier Analysis of the Phase Velocity Distributions of Mesospheric and Ionospheric Waves Based on Airglow Images Collected Over 10 Years: Comparison of Magadan, Russia, and Athabasca, Canada Open
We studied atmospheric gravity waves (AGWs) and nighttime medium‐scale traveling ionospheric disturbances (MSTIDs) using a three‐dimensional spectral analysis technique for airglow images at wavelengths of 557.7 nm (altitude: 90–100 km for…
View article: Issue Information
Issue Information Open
No abstract is available for this article.
View article: Statistical Analysis of SAR Arc Detachment From the Main Oval Based on 11‐Year, All‐Sky Imaging Observation at Athabasca, Canada
Statistical Analysis of SAR Arc Detachment From the Main Oval Based on 11‐Year, All‐Sky Imaging Observation at Athabasca, Canada Open
We report the first statistical analysis of stable auroral red (SAR) arc detachments from the main auroral oval, using 630‐nm all‐sky cooled‐Charge Coupled Device images obtained at Athabasca (magnetic latitude = 61.7°N), Canada. SAR arc d…
View article: Purple Auroral Rays and Global Pc1 Pulsations Observed at the CIR‐Associated Solar Wind Density Enhancement on 21 March 2017
Purple Auroral Rays and Global Pc1 Pulsations Observed at the CIR‐Associated Solar Wind Density Enhancement on 21 March 2017 Open
This paper reports two unique auroral features: postmidnight purple auroral rays and global Pc1 geomagnetic pulsations, observed before the onset of the corotating interaction region (CIR) storm of 21 March 2017, at the beginning of the fi…
View article: New science in plain sight: Citizen scientists lead to the discovery of optical structure in the upper atmosphere
New science in plain sight: Citizen scientists lead to the discovery of optical structure in the upper atmosphere Open
Citizen scientists, along with satellite and ground-based sensors, have revealed a new arc boundary at subauroral latitudes.
View article: Discovery of 1 Hz Range Modulation of Isolated Proton Aurora at Subauroral Latitudes
Discovery of 1 Hz Range Modulation of Isolated Proton Aurora at Subauroral Latitudes Open
Isolated proton aurora (IPA) is a manifestation of the wave‐particle interaction visible at subauroral latitudes, with activity on many timescales. We herein present the first observational evidence of rapid luminous modulation of IPA corr…
View article: Enhanced interlaminar excitation or reduced superficial layer inhibition in neocortex generates different spike-and-wave-like electrographic events in vitro
Enhanced interlaminar excitation or reduced superficial layer inhibition in neocortex generates different spike-and-wave-like electrographic events in vitro Open
Acute in vitro models have revealed a great deal of information about mechanisms underlying many types of epileptiform activity. However, few examples exist that shed light on spike-and-wave (SpW) patterns of pathological activity. SpW are…
View article: Fast modulations of pulsating proton aurora related to subpacket structures of Pc1 geomagnetic pulsations at subauroral latitudes
Fast modulations of pulsating proton aurora related to subpacket structures of Pc1 geomagnetic pulsations at subauroral latitudes Open
To understand the role of electromagnetic ion cyclotron (EMIC) waves in determining the temporal features of pulsating proton aurora (PPA) via wave‐particle interactions at subauroral latitudes, high‐time‐resolution (1/8 s) images of proto…
View article: Issue Information
Issue Information Open
No abstract is available for this article.
View article: Possible generation mechanisms for Pc1 pearl structures in the ionosphere based on 6 years of ground observations in Canada, Russia, and Japan
Possible generation mechanisms for Pc1 pearl structures in the ionosphere based on 6 years of ground observations in Canada, Russia, and Japan Open
We investigate pearl structures (amplitude modulations) of Pc1 pulsations simultaneously observed at Athabasca (ATH, 54.7°N, 246.7°E, L = 4.3) in Canada, Magadan (MGD, 60.1°N, 150.7°E, L = 2.6) in Russia, and Moshiri (MOS, 44.4°N, 142.3°E,…
View article: The AUTUMNX magnetometer meridian chain in Québec, Canada
The AUTUMNX magnetometer meridian chain in Québec, Canada Open
The AUTUMNX magnetometer array consists of 10 THEMIS-class ground-based magnetometers deployed to form a meridian chain on the eastern coast of Hudson Bay in eastern Canada, a second partial chain one hour of magnetic local time further ea…