G. P. Zank
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View article: Slab Turbulence in the Very Local Interstellar Medium and the IBEX Ribbon
Slab Turbulence in the Very Local Interstellar Medium and the IBEX Ribbon Open
In this study, we analyze an important property of the very local interstellar medium, i.e., turbulence that affects the intensity and shape of the Interstellar Boundary Explorer (IBEX) ribbon. Specifically, we simulate the propagation of …
View article: Interstellar Mapping And Acceleration Probe: The NASA IMAP Mission
Interstellar Mapping And Acceleration Probe: The NASA IMAP Mission Open
View article: Reynolds Number and Viscosity in the Solar Wind
Reynolds Number and Viscosity in the Solar Wind Open
The Reynolds number is a key dimensionless parameter used to distinguish turbulent flow from laminar flow. We present generalized expressions for both the Reynolds number and viscosity, incorporating the spectral indices of the inertial ra…
View article: The Global Structure of the Heliosphere
The Global Structure of the Heliosphere Open
As the Sun moves through the local interstellar medium (LISM), it emits charged particles, creating the heliosphere occupied by the plasma of solar origin. Determining the structure of the heliosphere is a fundamental question that can be …
View article: Magnetic Turbulence Intermittency and Compressibility in the Inner Heliosheath and Very Local Interstellar Medium
Magnetic Turbulence Intermittency and Compressibility in the Inner Heliosheath and Very Local Interstellar Medium Open
We analyze Voyager 1 magnetic field data through 2024 to study fluctuations from the inner heliosheath into the very local interstellar medium (VLISM). We focus on inertial-range intermittency and magnetic compressibility and examine the e…
View article: Survival of 2D Turbulence in the Local Interstellar Medium
Survival of 2D Turbulence in the Local Interstellar Medium Open
The evolution of 2D turbulence in the partially ionized local interstellar medium is investigated using 2D MHD simulations coupled with a neutral hydrogen gas via charge exchange. While it has been discussed that Alfvén and compressible wa…
View article: Parallel and Perpendicular Diffusion of Energetic Particles in the Near-Sun Solar Wind Observed by Parker Solar Probe
Parallel and Perpendicular Diffusion of Energetic Particles in the Near-Sun Solar Wind Observed by Parker Solar Probe Open
We investigate energetic particle diffusion in the inner heliosphere (∼0.06–0.3 au) explored by Parker Solar Probe (PSP). Parallel ( κ ∥ ) and perpendicular ( κ ⊥ ) diffusion coefficients are calculated using second-order quasi-linear theo…
View article: One-Dimensional Analytical Solutions of the Transport Equations for Incompressible Magnetohydrodynamic (MHD) Turbulence
One-Dimensional Analytical Solutions of the Transport Equations for Incompressible Magnetohydrodynamic (MHD) Turbulence Open
We derive one-dimensional (1D) analytical solutions for the transport equations of incompressible magnetohydrodynamic (MHD) turbulence, including the Elsässer energies and the correlation lengths. The solutions are suitable for an arbitrar…
View article: Suppression of Magnetopause Reconnection in the Presence of Cold Magnetospheric Plasma
Suppression of Magnetopause Reconnection in the Presence of Cold Magnetospheric Plasma Open
The temporal variability of magnetopause reconnection is an important aspect of solar wind magnetosphere coupling. Even under stable solar wind driving, reconnection can be triggered, modulated, or suppressed because of magnetic field and …
View article: The Role of Pickup Ions in the Interaction of the Solar Wind with the Local Interstellar Medium. II. Effects of Solar Cycle
The Role of Pickup Ions in the Interaction of the Solar Wind with the Local Interstellar Medium. II. Effects of Solar Cycle Open
We investigate the role of pickup ions (PUIs) in the interaction of a periodically varying solar wind (SW) with the local interstellar medium (LISM). The analysis is performed using a 3D, time-dependent, multifluid model, where PUIs are tr…
View article: Validating an Atmospheric Absorption Model through Solar Instrumentation on Sounding Rockets
Validating an Atmospheric Absorption Model through Solar Instrumentation on Sounding Rockets Open
Extreme-ultraviolet and X-ray data taken from suborbital sounding rocket platforms are affected by atmospheric absorption. The absorption correction factor varies with time, launch location, launch profile, and atmospheric conditions. This…
View article: Characterization of the Transmission and Generation of Turbulence at Interplanetary Shocks
Characterization of the Transmission and Generation of Turbulence at Interplanetary Shocks Open
We study the transmission and characteristics of turbulent magnetohydrodynamic (MHD) fluctuations from upstream to downstream regions of interplanetary (IP) shocks using the linear mode decomposition (LMD) technique of G. P. Zank et al. We…
View article: Influence of Solar Cycle on Magnetohydrodynamic Turbulent Modes at 1 au
Influence of Solar Cycle on Magnetohydrodynamic Turbulent Modes at 1 au Open
We study the effect of the solar cycle on various magnetohydrodynamic (MHD) fluctuation modes using the linear mode decomposition technique developed by G. P. Zank et al. We decompose various MHD modes, including propagating modes: Alfvén …
View article: Non-propagating structures and propagating waves in solar wind turbulence revealed by simulations and observations
Non-propagating structures and propagating waves in solar wind turbulence revealed by simulations and observations Open
Structures and waves are common features of solar wind turbulence at various scales. The interplay between structures and waves is important for processes such as the turbulent energy cascade, plasma heating, and particle scattering. Our u…
View article: One dimensional analytical solutions of the transport equations for incompressible magnetohydrodynamic (MHD) turbulence
One dimensional analytical solutions of the transport equations for incompressible magnetohydrodynamic (MHD) turbulence Open
We derive one dimensional (1D) analytical solutions for the transport equations of incompressible magnetohydrodynamic (MHD) turbulence developed by Zank et al. [2012], Adhikari et al. [2023], including the Elsässer energies and the correla…
View article: Kinetic Modeling of Inertial Alfvén Waves in the Solar Corona: Implications for Heating and Particle Acceleration
Kinetic Modeling of Inertial Alfvén Waves in the Solar Corona: Implications for Heating and Particle Acceleration Open
View article: Solar coronal heating: role of kinetic and inertial Alfvén waves in heating and charged particle acceleration
Solar coronal heating: role of kinetic and inertial Alfvén waves in heating and charged particle acceleration Open
A comprehensive understanding of solar coronal heating and charged particle acceleration remains one of the most critical challenges in space and astrophysical plasma physics. In this study, we explore the contribution of Alfvén waves – bo…
View article: Nonlinear kinetic simulations of Jeans instability in a magnetized dusty plasma
Nonlinear kinetic simulations of Jeans instability in a magnetized dusty plasma Open
The Jeans instability in a magnetized dusty plasma is considered a fundamental process in space, where magnetic fields are common. We investigate the Jeans instability in a magnetized dusty plasma using 1D and 2D particle-in-cell simulatio…
View article: Evolution of Solar Wind Turbulence during Radial Alignment of Parker Solar Probe and Solar Orbiter in 2022 December
Evolution of Solar Wind Turbulence during Radial Alignment of Parker Solar Probe and Solar Orbiter in 2022 December Open
We investigate the radial evolution of solar wind turbulence during the radial alignment of Parker Solar Probe (PSP) and Solar Orbiter (SO) on 2022 December 10, with PSP located at approximately 0.11 au and SO near 0.88 au. To identify nea…
View article: Theory and observations of the interaction between magnetohydrodynamic waves and shocks
Theory and observations of the interaction between magnetohydrodynamic waves and shocks Open
The interaction between interplanetary shocks or planetary bow shock and upstream magnetohydrodynamics (MHD) waves (hereafter referred to as wave–shock interactions) is of fundamental importance to plasma physics. Linear waves and shocks, …
View article: An Anisotropic Plasma Model of the Heliospheric Interface
An Anisotropic Plasma Model of the Heliospheric Interface Open
We present a pioneering model of the interaction between the solar wind and the surrounding interstellar medium that includes the possibility of different pressures in directions parallel and perpendicular to the magnetic field. The outer …
View article: Solar Coronal Heating: Role of Kinetic and Inertial Alfvén Waves in Heating and Charged Particle Acceleration
Solar Coronal Heating: Role of Kinetic and Inertial Alfvén Waves in Heating and Charged Particle Acceleration Open
A comprehensive understanding of solar coronal heating and charged particle acceleration remains one of the most critical challenges in space and astrophysical plasma physics. In this study, we explore the contribution of Alfvén waves, bot…
View article: Transition from Vortical to Alfvénic-like Fermi Electron Acceleration in Magnetic Reconnection with Increasing Guide Field
Transition from Vortical to Alfvénic-like Fermi Electron Acceleration in Magnetic Reconnection with Increasing Guide Field Open
Using particle-in-cell simulations of magnetic reconnection (MR), we investigate how the changing magnetic guide field strength impacts the evolution of electron Kelvin–Helmholtz instability (EKHI) and the associated Fermi electron acceler…
View article: Hybrid Simulations of Interstellar Pickup Ions at the Solar Wind Termination Shock Revisited
Hybrid Simulations of Interstellar Pickup Ions at the Solar Wind Termination Shock Revisited Open
We revisit previous hybrid simulations of the heating and acceleration of interstellar pickup ions (PUIs) at the solar wind termination shock. In previous simulations, a relatively cold initial distribution of PUIs was assumed; and while t…
View article: PUI Heating in the Supersonic Solar Wind
PUI Heating in the Supersonic Solar Wind Open
The outer heliosphere is profoundly influenced by nonthermal energetic pickup ions (PUIs), which dominate the internal pressure of the solar wind beyond ~10 au, surpassing both solar wind and magnetic pressures. PUIs are formed mostly thro…
View article: Transonic Turbulence and Density Fluctuations in the Near-Sun Solar Wind
Transonic Turbulence and Density Fluctuations in the Near-Sun Solar Wind Open
We use in situ measurements from the first 19 encounters of Parker Solar Probe and the most recent five encounters of Solar Orbiter to study the evolution of the turbulent sonic Mach number M t (the ratio of the amplitude of velocity fluct…
View article: Radial Evolution of MHD Turbulence Anisotropy in Low Mach Number Solar Wind
Radial Evolution of MHD Turbulence Anisotropy in Low Mach Number Solar Wind Open
The Parker Solar Probe (PSP) and Wind spacecraft observed the same plasma flow during PSP encounter 15. The solar wind evolves from a sub-Alfvénic flow at 0.08 au to become modestly super-Alfvénic at 1 au. We study the radial evolution of …
View article: A study of particle acceleration, heating, power deposition, and the damping length of kinetic Alfvén waves in non-Maxwellian coronal plasma
A study of particle acceleration, heating, power deposition, and the damping length of kinetic Alfvén waves in non-Maxwellian coronal plasma Open
Context. The heating of the solar corona and solar wind, particularly through suprathermal particles and kinetic Alfvén waves (KAWs) within the 0–10 R Sun range, has been a subject of great interest for many decades. This study investigate…
View article: A study of particle acceleration, heating, power deposition, and the damping length of kinetic Alfvén waves in non-Maxwellian coronal plasma
A study of particle acceleration, heating, power deposition, and the damping length of kinetic Alfvén waves in non-Maxwellian coronal plasma Open
The heating of the solar corona and solar wind, through suprathermal particles and kinetic Alfvén waves within the 0 - 10 $R_{\rm Sun}$ range, has been a subject of great interest for many decades. This study investigates the acceleration …
View article: Alfvén waves in the solar corona: resonance velocity, damping length, and charged particles acceleration by kinetic Alfvén waves
Alfvén waves in the solar corona: resonance velocity, damping length, and charged particles acceleration by kinetic Alfvén waves Open