R. Rankin
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View article: A galactic cosmic ray cavity in Earth-Moon space
A galactic cosmic ray cavity in Earth-Moon space Open
In regions of the solar system distant from planetary magnetic fields, galactic cosmic rays (GCRs) have generally been assumed to be uniformly distributed throughout interplanetary space. However, our analysis of data from the Chang’E-4 la…
View article: On the Contribution of Latitude‐Dependent ULF Waves to the Radial Transport of Off‐Equatorial Relativistic Electrons in the Radiation Belts
On the Contribution of Latitude‐Dependent ULF Waves to the Radial Transport of Off‐Equatorial Relativistic Electrons in the Radiation Belts Open
Ultra‐low frequency (ULF) waves radially diffuse hundreds‐keV to few‐MeV electrons in the magnetosphere, as the range of drift frequencies of such electrons overlaps with the wave frequencies, leading to resonant interactions. Theoreticall…
View article: On Energization and Loss of the Ionized Heavy Atom and Molecule in Mars' Atmosphere
On Energization and Loss of the Ionized Heavy Atom and Molecule in Mars' Atmosphere Open
The absence of global magnetic fields is often cited to explain why Mars lacks a dense atmosphere. This line of thought is based on a prevailing theory that magnetic fields can shield the atmosphere from solar wind erosion. However, we pre…
View article: Calculation of photoelectron induced UV emission with application to the SMILE mission
Calculation of photoelectron induced UV emission with application to the SMILE mission Open
The SMILE mission, supported by the European Space Agency and the Chinese Academy of Sciences, is scheduled for launch in 2024. The mission is augmented by a substantial ground-based network of optical ASI's. Here, we report  progress…
View article: Full Moon Phase: Lunar Surface Charging in Plasma Sheet - PIC Simulation
Full Moon Phase: Lunar Surface Charging in Plasma Sheet - PIC Simulation Open
Understanding lunar surface charging mechanisms is pivotal for unravelling the complexities of the lunar environment. This research utilizes particle-in-cell (PIC) code simulations to investigate the breakdown of plasma sheet quasi-neutral…
View article: The Dynamics of Earth’s Cusp in Response to the Interplanetary Shock
The Dynamics of Earth’s Cusp in Response to the Interplanetary Shock Open
The Earth’s magnetospheric cusp, a region with an off-equatorial magnetic field minimum, is an important place which directly transports plasma and energy from the solar wind into the magnetosphere and ionosphere. Its magnetic topology and…
View article: Characteristics of Electron Precipitation Directly Driven by Poloidal ULF Waves
Characteristics of Electron Precipitation Directly Driven by Poloidal ULF Waves Open
A mechanism recently proposed for magnetospheric electron loss into the atmosphere is the precipitation directly driven by ultralow‐frequency (ULF) waves. In this study, we quantitatively analyze the properties of ULF wave‐induced precipit…
View article: New pathways for EMIC wave propagation within the ionosphere: SWARM observations and modelling
New pathways for EMIC wave propagation within the ionosphere: SWARM observations and modelling Open
Electromagnetic ion cyclotron (EMIC) waves are important because of their essential role in reducing the amount of radiation in the Earth's radiation belts under geomagnetic storm conditions. In this presentation, we show results from a ne…
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: Linear and Nonlinear Kelvin–Helmholtz Instability and Magnetohydrodynamic Wave Emission in Sheared Astrophysical Plasma Flows
Linear and Nonlinear Kelvin–Helmholtz Instability and Magnetohydrodynamic Wave Emission in Sheared Astrophysical Plasma Flows Open
The evolution of the Kelvin–Helmholtz instability (KHI) and magnetohydrodynamic (MHD) wave emission is investigated at shear-flow boundaries of magnetized plasmas. While MHD wave emission has been suggested to be only possible during the n…
View article: Ion Behavior at Shocklets: A Case Study of MMS Observations
Ion Behavior at Shocklets: A Case Study of MMS Observations Open
The existence of shocklets, a kind of solitary structure, has been demonstrated in the Earth's foreshock regions for decades. Their formation and evolution are believed to be controlled by ions. However, the detailed behavior of ions at th…
View article: A new interpretation of the ionospheric feedback instability applied to feld line resonances and the ionospheric Alfven resonator
A new interpretation of the ionospheric feedback instability applied to feld line resonances and the ionospheric Alfven resonator Open
<p>It is demonstrated that the application of a height-integrated conductivity (HIC) boundary condition in theories of the ionospheric feedback instability is valid only for very thin (few km) conducting layers. In the presence of gl…
View article: Origin of Frequency‐Doubling and Shoulder‐Like Magnetic Pulsations in ULF Waves
Origin of Frequency‐Doubling and Shoulder‐Like Magnetic Pulsations in ULF Waves Open
We present Van Allen Probes observations of a long‐lasting ultralow frequency (ULF) wave event with frequency doubling features in the compressional wave component. The azimuthal magnetic field, on the other hand, shows shoulder‐like pulsa…
View article: Observations of an Electron‐Cold Ion Component Reconnection at the Edge of an Ion‐Scale Antiparallel Reconnection at the Dayside Magnetopause
Observations of an Electron‐Cold Ion Component Reconnection at the Edge of an Ion‐Scale Antiparallel Reconnection at the Dayside Magnetopause Open
Solar wind parameters play a dominant role in reconnection rate, which controls the solar wind‐magnetosphere coupling efficiency at Earth's magnetopause. Besides, low‐energy ions from the ionosphere, frequently detected on the magnetospher…
View article: Observations of an Electron-cold Ion Component Reconnection at the Edge\n of an Ion-scale Antiparallel Reconnection at the Dayside Magnetopause
Observations of an Electron-cold Ion Component Reconnection at the Edge\n of an Ion-scale Antiparallel Reconnection at the Dayside Magnetopause Open
Solar wind parameters play a dominant role in reconnection rate, which\ncontrols the solar wind-magnetosphere coupling efficiency at Earth's\nmagnetopause. Besides, low-energy ions from the ionosphere, frequently detected\non the magnetosp…
View article: Novel EMIC Wave Propagation Pathway Through Buchsbaum Resonance and Inter-Hemispheric Wave Interference: Swarm Observations and Modelling
Novel EMIC Wave Propagation Pathway Through Buchsbaum Resonance and Inter-Hemispheric Wave Interference: Swarm Observations and Modelling Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Geophysical Research Letters. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn mo…
View article: Novel EMIC Wave Propagation Pathway Through Buchsbaum Resonance and Inter-Hemispheric Wave Interference: Swarm Observations and Modelling
Novel EMIC Wave Propagation Pathway Through Buchsbaum Resonance and Inter-Hemispheric Wave Interference: Swarm Observations and Modelling Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Geophysical Research Letters. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn mo…
View article: Correction to: Small-Scale Dynamic Aurora
Correction to: Small-Scale Dynamic Aurora Open
A Correction to this paper has been published: 10.1007/s11214-021-00821-y
View article: Mercury’s Ring Current: MESSENGER Observations and Test-Particle Simulations
Mercury’s Ring Current: MESSENGER Observations and Test-Particle Simulations Open
Energetic protons can carry a longitudinal electric current via their gradient and curvature drift around a planet and form a current system known as the ring current. The ring current has been observed in the intrinsic magnetosphere of Ea…
View article: Photoelectron transport and associated Far Ultraviolet emissions: Model simulation and comparison with observations
Photoelectron transport and associated Far Ultraviolet emissions: Model simulation and comparison with observations Open
<p>Photoelectrons are produced by solar Extreme Ultraviolet radiation and contribute significantly to the ionization and heat balances in planetary upper atmospheres. They are also the source of dayglow emissions, whose intensities m…
View article: A Short‐lived Three‐Belt Structure for sub‐MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence
A Short‐lived Three‐Belt Structure for sub‐MeV Electrons in the Van Allen Belts: Time Scale and Energy Dependence Open
In this study we focus on the radiation belt dynamics driven by the geomagnetic storms during September 2017. Besides the long‐lasting three‐belt structures of ultrarelativistic electrons ( > 2 MeV, existing for tens of days), which has be…
View article: Simultaneous Observations of Localized and Global Drift Resonance
Simultaneous Observations of Localized and Global Drift Resonance Open
In this study, we present Van Allen Probe observations showing that seed (hundreds of keV) and core ( 1 MeV) electrons can resonate with ultra‐low‐frequency (ULF) wave modes with distinctive m values simultaneously. An unusual electron ene…
View article: ULF waves and their influence on radiation belt dynamics in Earth's magnetosphere
ULF waves and their influence on radiation belt dynamics in Earth's magnetosphere Open
<p>Recent observations from the Van Allen Probes mission have established that Pc3-5 ultra-low-frequency (ULF) waves can energize ions and electrons via drift-resonance and drift-bounce resonance. The extent to which these waves cont…
View article: Electron- and proton-scale nested magnetic cavities: Manifestation of kinetic theta-pinch equilibrium in space plasmas
Electron- and proton-scale nested magnetic cavities: Manifestation of kinetic theta-pinch equilibrium in space plasmas Open
<p>Magnetic cavities, sometimes referred to as magnetic holes, are ubiquitous in space and astrophysical plasmas characterized by localized regions with depressed magnetic field strength, strongly anisotropic particle distributions, …