L. Olifer
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View article: Extremely rapid radiation belt electron losses across the magnetopause
Extremely rapid radiation belt electron losses across the magnetopause Open
Introduction The Earth’s radiation belt environment is highly dynamic, with different processes acting on various particle populations over a range of timescales. Constraining the timescales over which these processes act is essential to b…
View article: Evidence for a Natural Limit to Electron Space Radiation: An Application of Benford's Law
Evidence for a Natural Limit to Electron Space Radiation: An Application of Benford's Law Open
Recent research has highlighted observational evidence for a natural limit to the severity of energetic electron differential fluxes in the Van Allen radiation belts. Here, we analyze the occurrence distributions of electron differential f…
View article: A New Mechanism for ULF Wave Modulation of Energetic Electron Precipitation
A New Mechanism for ULF Wave Modulation of Energetic Electron Precipitation Open
The May 2024 geomagnetic superstorm provided the opportunity to explore how strong wave-particle interactions affect energetic electron precipitation under intense driving. Using coordinated measurements from a balloon-borne Timepix-based …
View article: Diagnosing the Rapid Loss of Outer Radiation Belt Electrons Due To Strong Chorus‐Driven Wave‐Particle Interactions Along an Electron Injection Path
Diagnosing the Rapid Loss of Outer Radiation Belt Electrons Due To Strong Chorus‐Driven Wave‐Particle Interactions Along an Electron Injection Path Open
Multi‐spacecraft data demonstrate that intense chorus waves are excited during electron injection events that drive rapid radiation belt electron loss across a limited energy range from 100 to 300 keV on sub‐drift timescales through strong…
View article: The Effect of Intense Chorus Waves on the Storm‐Time Outer Radiation Belt Relativistic Electron Dynamics
The Effect of Intense Chorus Waves on the Storm‐Time Outer Radiation Belt Relativistic Electron Dynamics Open
We investigate the effects of intense chorus waves (wave power ) on relativistic electrons (E 0.5 MeV) in the heart of the outer radiation belt ( = 4–6) using superposed epoch analyses. Combining electron flux and electromagnetic wave meas…
View article: Low‐Cost Monitoring of Energetic Particle Precipitation: Weather Balloon‐Borne Timepix Measurements During the May 2024 Superstorm
Low‐Cost Monitoring of Energetic Particle Precipitation: Weather Balloon‐Borne Timepix Measurements During the May 2024 Superstorm Open
Understanding energetic electron precipitation is crucial for accurate space weather modeling and forecasting, impacting the Earth's upper atmosphere and human infrastructure. This study presents a low‐cost, low‐mass, and low‐power solutio…
View article: Low-cost Monitoring of Energetic Particle Precipitation: Weather Balloon-borne Timepix Measurements During the May 2024 Superstorm
Low-cost Monitoring of Energetic Particle Precipitation: Weather Balloon-borne Timepix Measurements During the May 2024 Superstorm Open
Understanding energetic electron precipitation is crucial for accurate space weather modeling and forecasting, impacting the Earth's upper atmosphere and human infrastructure. This study presents a low-cost, low-mass, and low-power solutio…
View article: The Relationship Between Electron Precipitation and the Population of Trapped Electrons in LEO: New Evidence Supporting a Natural Limit to the Flux of Energetic Electrons
The Relationship Between Electron Precipitation and the Population of Trapped Electrons in LEO: New Evidence Supporting a Natural Limit to the Flux of Energetic Electrons Open
Energetic particle precipitation into the atmosphere has been identified as a key loss process for electrons in the Earth's outer radiation belt region. However, direct measurements of the electron flux precipitating into the atmosphere ar…
View article: Rapid Acceleration Bursts in the Van Allen Radiation Belt
Rapid Acceleration Bursts in the Van Allen Radiation Belt Open
The fast Van Allen radiation belt electron dynamics during geomagnetic storms have not yet been fully explained, in part due to limitations of standard satellite missions in both orbit and the number of spacecraft. Here we overcome these l…
View article: The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission
The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission Open
The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) is a low-Earth orbiting Canadian small satellite mission investigating the transport of space radiation into the atmosphere, and its impact on Earth’s climate…
View article: The spatial localisation of storm-time ULF waves due to plasmaspheric plumes and implications for calculating radial diffusion
The spatial localisation of storm-time ULF waves due to plasmaspheric plumes and implications for calculating radial diffusion Open
The generation and propagation of Ultra Low Frequency (ULF) waves are intrinsically coupled to the cold plasma population in the terrestrial magnetosphere. During geomagnetic storms, extreme reconfigurations of the cold plasma creates a co…
View article: ULF Wave Transport of Relativistic Electrons in the Van Allen Belts: Criteria for Transition to Radial Diffusion
ULF Wave Transport of Relativistic Electrons in the Van Allen Belts: Criteria for Transition to Radial Diffusion Open
Relativistic electrons in the radiation belts can be transported as a result of wave-particle interactions (WPI) with ultra-low frequency (ULF) waves. Such WPI are often assumed to be diffusive, parametric models for the radial diffusion c…
View article: Intense chorus waves mitigate the loss of outer radiation belt relativistic electrons during storm main phase
Intense chorus waves mitigate the loss of outer radiation belt relativistic electrons during storm main phase Open
We investigate the effects of intense chorus waves (wave power > 10-4 nT2) on relativistic electrons (E > 0.5 MeV) in the heart of the outer radiation belt (L* = 4 - 6) using superposed epoch approach. Combining electron flux and electroma…
View article: Intense Energetic Electron Precipitation Caused by the Self‐Limiting of Space Radiation
Intense Energetic Electron Precipitation Caused by the Self‐Limiting of Space Radiation Open
Understanding intense electron precipitation is crucial for characterizing radiation belt loss and assessing related impacts on the atmosphere. We investigate the evolution of electron flux during an ensemble of 70 geomagnetic storms, focu…
View article: The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles
The Response of Electron Pitch Angle Distributions to the Upper Limit on Stably Trapped Particles Open
We use Van Allen Probes electron data during 70 geomagnetic storms to examine the response of equatorial pitch angle distributions (PADs) at L* = 4.0–4.5 to a theoretical upper limit on stably trapped particle fluxes. Of the energies exami…
View article: A New Four‐Component <i>L</i>*‐Dependent Model for Radial Diffusion Based on Solar Wind and Magnetospheric Drivers of ULF Waves
A New Four‐Component <i>L</i>*‐Dependent Model for Radial Diffusion Based on Solar Wind and Magnetospheric Drivers of ULF Waves Open
Waves which couple to energetic electrons are particularly important in space weather, as they drive rapid changes in the topology and intensity of Earth's outer radiation belt during geomagnetic storms. This includes Ultra Low Frequency (…
View article: Outer radiation belt electron flux and phase space density changes during sheath regions of coronal mass ejections from Van Allen Probes and GPS data
Outer radiation belt electron flux and phase space density changes during sheath regions of coronal mass ejections from Van Allen Probes and GPS data Open
Turbulent and compressed sheath regions ahead of interplanetary coronal mass ejections are key drivers of dramatic changes in the electron fluxes in the Earth’s outer radiation belt. They are also associated with elevated wave activi…
View article: A New Four-Component L*-dependent Model for Radial Diffusion based on Solar Wind and Magnetospheric Drivers of ULF Waves
A New Four-Component L*-dependent Model for Radial Diffusion based on Solar Wind and Magnetospheric Drivers of ULF Waves Open
Waves which couple to energetic electrons are particularly important in space weather, as they drive rapid changes in the topology and intensity of Earth’s outer radiation belt during geomagnetic storms. This includes Ultra Low Frequency (…
View article: Outer Radiation Belt Flux and Phase Space Density Response to Sheath Regions: Van Allen Probes and GPS Observations
Outer Radiation Belt Flux and Phase Space Density Response to Sheath Regions: Van Allen Probes and GPS Observations Open
Turbulent and compressed sheath regions preceding interplanetary coronal mass ejections strongly impact electron dynamics in the outer radiation belt. Changes in electron flux can occur on timescales of tens of minutes, which are unlikely …
View article: The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission
The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) Mission Open
The RADiation Impacts on Climate and Atmospheric Loss Satellite (RADICALS) is a low-Earth orbiting Canadian small satellite mission investigating the transport of space radiation into the atmosphere, and its impact on Earth's climate.Sched…
View article: On the Role of the Last Closed Drift Shell and ULF-Wave Radial Diffusion in Driving Fast and Repeatable Radiation Belt Electron Loss
On the Role of the Last Closed Drift Shell and ULF-Wave Radial Diffusion in Driving Fast and Repeatable Radiation Belt Electron Loss Open
Dynamics of relativistic and ultra-relativistic electrons, trapped in the Earth's Van Allen radiation belts, have been actively studied since their discovery over 50 years ago.However, properly characterizing fast changes in electron flux …
View article: Intense chorus waves are the cause of flux-limiting in the heart of the outer radiation belt
Intense chorus waves are the cause of flux-limiting in the heart of the outer radiation belt Open
Chorus waves play a key role in outer Van Allen electron belt dynamics through cyclotron resonance. Here, we use Van Allen Probes data to reveal a new and distinct population of intense chorus waves excited in the heart of the radiation be…
View article: Outer Radiation Belt Flux and Phase Space Density Response to Sheath Regions: Van Allen Probes and GPS Observations
Outer Radiation Belt Flux and Phase Space Density Response to Sheath Regions: Van Allen Probes and GPS Observations Open
Turbulent and compressed sheath regions preceding interplanetary coronal mass ejections (ICMEs) strongly impact electron dynamics in the outer radiation belt. Changes in electron flux can occur on timescales of tens of minutes, which is di…
View article: On the Similarity and Repeatability of Fast Magnetopause Shadowing Loss
On the Similarity and Repeatability of Fast Magnetopause Shadowing Loss Open
<p>Properly characterizing fast relativistic electron losses in the terrestrial Van Allen belts remains a significant challenge for accurately simulating their dynamics. In particular, magnetopause shadowing losses can deplete the ra…
View article: Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field‐Aligned Current Regions
Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field‐Aligned Current Regions Open
The locations of region 1 and 2 field‐aligned current systems were determined using fluxgate magnetometer measurements from 875 dawn‐dusk passes of the Swarm A satellite. Within each field‐aligned current region, the ionospheric Pedersen c…
View article: On the Formation of Phantom Electron Phase Space Density Peaks in Single Spacecraft Radiation Belt Data
On the Formation of Phantom Electron Phase Space Density Peaks in Single Spacecraft Radiation Belt Data Open
This study examines the rapid losses and acceleration of trapped relativistic and ultrarelativistic electron populations in the Van Allen radiation belt during the September 7–9, 2017 geomagnetic storm. By analyzing the dynamics of the las…
View article: Supplementary material for: "Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field Aligned Current Regions"
Supplementary material for: "Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field Aligned Current Regions" Open
Supplementary material for paper "Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field Aligned Current Regions", submitted to the Geophysical Research Letters.
View article: Supplementary material for: "Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field Aligned Current Regions"
Supplementary material for: "Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field Aligned Current Regions" Open
Supplementary material for paper "Swarm Observations of Dawn/Dusk Asymmetries Between Pedersen Conductance in Upward and Downward Field Aligned Current Regions", submitted to the Geophysical Research Letters.