55 citations · 292 across the 20 of their papers we have counts for
21 papers
Intermittency in Voyager Magnetic Field Beyond the Heliosphere
L. Y. Khoo, G. Livadiotis, D. J. McComas +2
As the two Voyager spacecraft traveled beyond the heliosphere, they encountered a magnetic field environment that had never been observed before. Studies have attempted to characte…
Transfer of Entropy between the Magnetic Field and Solar Energetic Particles during an Interplanetary Coronal Mass Ejection
M. E. Cuesta, G. Livadiotis, D. J. McComas +4
Thermodynamics of solar wind bulk plasma have been routinely measured and quantified, unlike those of solar energetic particles (SEPs), whose thermodynamic properties have remained…
High-Resolution Observations of Pickup Ion Mediated Shocks to 60 au
Bishwas L. Shrestha, David J. McComas, Eric J. Zirnstein +10
This study provides a detailed analysis of fourteen distant interplanetary shocks observed by the Solar Wind Around Pluto (SWAP) instrument onboard New Horizons. These shocks were…
What defines stationarity in space plasmas
George Livadiotis, David J. McComas
Starting from the concept of entropy defect in thermodynamics, we construct the entropy formulation of space plasmas, and then use it to develop a measure of their stationarity. In…
Polytropic Behavior in Corotating Interaction Regions: Evidence of Alfvénic Heating
M. A. Dayeh, M. J. Starkey, G. Livadiotis +5
Corotating Interaction Regions (CIRs) are recurring structures in the solar wind, characterized by interactions between fast and slow solar wind streams that compress and heat plas…
Comparing Methods for Calculating Solar Energetic Particle Intensities: Re-binning versus Spectral Binning
M. E. Cuesta, L. Y. Khoo, G. Livadiotis +13
Solar energetic particle (SEP) events have been observed for decades in the interplanetary medium by spacecraft measuring the intensity of energetic ions and electrons. These inten…
The Theory of Thermodynamic Relativity
George Livadiotis, David J. McComas
We introduce the theory of thermodynamic relativity, a unified framework for describing both entropies and velocities, and their respective disciplines of thermodynamics and kinema…
Observations of Kappa Distributions in Solar Energetic Protons and Derived Thermodynamic Properties
M. E. Cuesta, A. T. Cummings, G. Livadiotis +13
In this paper we model the high-energy tail of observed solar energetic proton energy distributions with a kappa distribution function. We employ a technique for deriving the therm…
Kappa-tail technique: Modeling and application to Solar Energetic Particles observed by Parker Solar Probe
G. Livadiotis, A. T. Cummings, M. E. Cuesta +10
We develop the kappa-tail fitting technique, which analyzes observations of power-law tails of distributions and energy-flux spectra and connects them to theoretical modeling of ka…
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…
Physical correlations lead to kappa distributions
George Livadiotis, David J. McComas
The recently developed concept of "entropic defect" is important for understanding the foundations of thermodynamics in space plasma physics, and more generally, for systems with p…
Thermodynamics of the inner heliosheath
G. Livadiotis, D. J. McComas, H. O. Funsten +3
We derive annual skymaps of the proton temperature in the inner heliosheath (IHS), and track their temporal evolution over the years from 2009 to 2016 of Interstellar Boundary Expl…
Radial profile of the polytropic index of solar wind plasma in the heliosphere
George Livadiotis
We combine different measurements of the polytropic index of the proton plasma in the heliosphere: i) near-adiabatic index in the inner heliosphere ~1AU, ii) subadiabatic indices i…
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…
Estimation of turbulent heating of solar wind protons at 1AU
George Livadiotis, Maher A. Dayeh, Gary P. Zank
The paper presents a new method for deriving turbulent heating of the solar wind using plasma moments and magnetic field data. We develop the method and then apply it to compute th…
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…
Mapping the Interstellar Magnetic Field Around the Heliosphere with Polarized Starlight
P. C. Frisch, A. B. Berdyugin, V. Piirola +20
Starlight that becomes linearly polarized by magnetically aligned dust grains provides a viable diagnostic of the interstellar magnetic field (ISMF). A survey is underway to map th…
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…
Correcting the record on the analysis of IBEX and STEREO data regarding variations in the neutral interstellar wind
P. C. Frisch, M. Bzowski, C. Drews +6
The journey of the Sun through space carries the solar system through a dynamic interstellar environment that is presently characterized by Mach 1 motion between the heliosphere an…