112 citations · 568 across the 21 of their papers we have counts for
22 papers
The polytropic behavior of Solar Wind protons as observed by Ulysses spacecraft during Solar minimum
Georgios Nicolaou, George Livadiotis, David J. McComas
We analyze proton bulk parameters derived from Ulysses observations and investigate the polytropic behavior of solar wind protons over a wide range of heliocentric distances and la…
Thermal energy budget of electrons in the inner heliosphere: Parker Solar Probe Observations
Joel B. Abraham, Daniel Verscharen, Robert T. Wicks +4
We present an observational analysis of the electron thermal energy budget using data from Parker Solar Probe. We use the macroscopic moments, obtained from our fits to the measure…
Distinct polytropic behavior of plasma during ICME-HSS Interaction
Kalpesh Ghag, Anil Raghav, Zubair Shaikh +3
Interplanetary Coronal Mass Ejections (ICMEs) and High Speed Streams (HSSs) are noteworthy drivers of disturbance of interplanetary space. Interaction between them can cause severa…
Energy transport during 3D small-scale reconnection driven by anisotropic plasma turbulence
Jeffersson A. Agudelo Rueda, Daniel Verscharen, Robert T. Wicks +6
Energy dissipation in collisionless plasmas is a longstanding fundamental physics problem. Although it is well known that magnetic reconnection and turbulence are coupled and trans…
Radial evolution of thermal and suprathermal electron populations in the slow solar wind from 0.13 to 0.5 au : Parker Solar Probe Observations
Joel B. Abraham, Christopher J Owen, Daniel Verscharen +8
We develop and apply a bespoke fitting routine to a large volume of solar wind electron distribution data measured by Parker Solar Probe (PSP) over its first five orbits, covering…
The Stability of the Electron Strahl against the Oblique Fast-magnetosonic/Whistler Instability in the Inner Heliosphere
Seong-Yeop Jeong, Joel B. Abraham, Daniel Verscharen +8
We analyze the micro-kinetic stability of the electron strahl in the solar wind depending on heliocentric distance. The oblique fast-magnetosonic/whistler (FM/W) instability has em…
The Kinetic Expansion of Solar-Wind Electrons: Transport Theory and Predictions for the very Inner Heliosphere
Seong-Yeop Jeong, Daniel Verscharen, Christian Vocks +9
We propose a transport theory for the kinetic evolution of solar-wind electrons in the heliosphere. We derive a gyro-averaged kinetic transport equation that accounts for the spher…
Deriving the bulk properties of solar wind electrons observed by Solar Orbiter: A preliminary study of electron plasma thermodynamics
Georgios Nicolaou, Robert T. Wicks, Christopher J. Owen +8
We demonstrate the calculation of solar wind electron bulk parameters from recent observations by Solar Wind Analyser Electron Analyser System on board Solar Orbiter. We use our me…
Whistler instability driven by the sunward electron deficit in the solar wind
Laura Berčič, Daniel Verscharen, Christopher J. Owen +18
Solar wind electrons play an important role in the energy balance of the solar wind acceleration by carrying energy into interplanetary space in the form of electron heat flux. The…
First-year ion-acoustic wave observations in the solar wind by the RPW/TDS instrument onboard Solar Orbiter
D. Píša, J. Souček, O. Santolík +21
Electric field measurements of the Time Domain Sampler (TDS) receiver, part of the Radio and Plasma Waves (RPW) instrument on board Solar Orbiter, often exhibit very intense broadb…
Three-dimensional magnetic reconnection in particle-in-cell simulations of anisotropic plasma turbulence
Jeffersson A. Agudelo Rueda, Daniel Verscharen, Robert T. Wicks +6
We use 3D fully kinetic particle-in-cell simulations to study the occurrence of magnetic reconnection in a simulation of decaying turbulence created by anisotropic counter-propagat…
Relationship between polytropic index and temperature anisotropy in space plasmas
George Livadiotis, George Nicolaou
The paper develops a theoretical relationship between the polytropic index and the temperature anisotropy that may characterize space plasmas. The derivation is based on the correl…
Anisotropic kappa distributions I: Formulation based on particle correlations
George Livadiotis, George Nicolaou, Frederic Allegrini
We develop the theoretical basis for the connection of the variety of anisotropic distributions with the statistical correlations among particles velocity components. By examining…
Design and Optimization of a High-Time-Resolution Magnetic Plasma Analyzer (MPA)
Benjamin Criton, Georgios Nicolaou, Daniel Verscharen
In-situ measurements of space plasma throughout the solar system require high time resolution to understand the plasma's kinetic fine structure and evolution. In this context, rese…
Enhanced proton parallel temperature inside patches of switchbacks in the inner heliosphere
L. D. Woodham, T. S. Horbury, L. Matteini +16
Switchbacks are discrete angular deflections in the solar wind magnetic field that have been observed throughout the heliosphere. Recent observations by Parker Solar Probe (PSP) ha…
The Solar Orbiter Science Activity Plan: translating solar and heliospheric physics questions into action
I. Zouganelis, A. De Groof, A. P. Walsh +182
Solar Orbiter is the first space mission observing the solar plasma both in situ and remotely, from a close distance, in and out of the ecliptic. The ultimate goal is to understand…
Polytropic Behavior of Solar Wind Protons Observed by Parker Solar Probe
Georgios Nicolaou, George Livadiotis, Robert T. Wicks +2
A polytropic process describes the transition of a fluid from one state to another through a specific relationship between the fluid density and temperature. The value of the polyt…
The Impact of Turbulent Solar Wind Fluctuations on Solar Orbiter Plasma Proton Measurements
Georgios Nicolaou, Daniel Verscharen, Robert T. Wicks +1
Solar Orbiter will observe the Sun and the inner heliosphere to study the connections between solar activity, coronal structure, and the origin of the solar wind. The plasma instru…
The Fluid-like Behavior of Kinetic Alfvén Turbulence in Space Plasma
Honghong Wu, Daniel Verscharen, Robert T. Wicks +3
Kinetic Alfvén waves (KAWs) are the short-wavelength extension of the MHD Alfvén-wave branch in the case of highly-oblique propagation with respect to the background magnetic field…
The root of a comet tail - Rosetta ion observations at comet 67P/Churyumov--Gerasimenko
E. Behar, H. Nilsson, P. Henri +7
The first 1000 km of the ion tail of comet 67P/Churyumov-Gerasimenko were explored by the European Rosetta spacecraft, 2.7 au away from the Sun. We characterised the dynamics of bo…
Misestimation of temperature when applying Maxwellian distributions to space plasmas described by kappa distributions
Georgios Nicolaou, George Livadiotis
This paper presents the misestimation of temperature when observations from a kappa distributed plasma are analyzed as a Maxwellian. One common method to calculate the space plasma…
New Horizons Solar Wind Around Pluto (SWAP) Observations of the Solar Wind From 11-33 AU
H. A. Elliott, D. J. McComas, P. Valek +3
The Solar Wind Around Pluto (SWAP) instrument on NASA's New Horizon Pluto mission has collected solar wind observations en route from Earth to Pluto, and these observations continu…