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Found 11 entries in the Bibliography.
Showing entries from 1 through 11
2021 
Applicability of Taylor s hypothesis during Parker Solar Probe perihelia We investigate the validity of Taylor s hypothesis (TH) in the analysis of velocity and magnetic field fluctuations in Alfvénic solar wind streams measured by Parker Solar Probe (PSP) during the first four encounters. The analysis is based on a recent model of the spacetime correlation of magnetohydrodynamic (MHD) turbulence, which has been validated in highresolution numerical simulations of strong reduced MHD turbulence. We use PSP velocity and magnetic field measurements from 24 h intervals selected from each of the fir ... Perez, Jean; Bourouaine, Sofiane; Chen, Christopher; Raouafi, Nour; Published by: Astronomy and Astrophysics Published on: 06/2021 YEAR: 2021 DOI: 10.1051/00046361/202039879 Solar wind; Sun: heliosphere; turbulence; magnetohydrodynamics (MHD); plasmas; Astrophysics  Solar and Stellar Astrophysics; Physics  Plasma Physics; Physics  Space Physics; Parker Data Used 
How Alfvén waves energize the solar wind: heat versus work A growing body of evidence suggests that the solar wind is powered to a large extent by an Alfvénwave (AW) energy flux. AWs energize the solar wind via two mechanisms: heating and work. We use highresolution direct numerical simulations of reflectiondriven AW turbulence (RDAWT) in a fastsolarwind stream emanating from a coronal hole to investigate both mechanisms. In particular, we compute the fraction of the AW power at the coronal base ($P_\textrm AWb$) that is transferred to solarwind particles via heating between ... Perez, Jean; Chandran, Benjamin; Klein, Kristopher; Martinovic, Mihailo; Published by: Journal of Plasma Physics Published on: 04/2021 YEAR: 2021 DOI: 10.1017/S0022377821000167 Parker Data Used; astrophysical plasmas; space plasma physics; plasma nonlinear phenomena; Astrophysics  Solar and Stellar Astrophysics; Physics  Plasma Physics; Physics  Space Physics 
The nearSun streamer belt solar wind: turbulence and solar wind acceleration Chen, C.; Chandran, B.; Woodham, L.; Jones, S.; Perez, J.; Bourouaine, S.; Bowen, T.; Klein, K.; Moncuquet, M.; Kasper, J.; Bale, S.; Published by: Astronomy and Astrophysics Published on: YEAR: 2021 DOI: "10.1051/00046361/202039872" 
2020 
Turbulence Characteristics of Switchback and Nonswitchback Intervals Observed by Parker Solar Probe We use Parker Solar Probe (PSP) in situ measurements to analyze the characteristics of solar wind turbulence during the first solar encounter covering radial distances between 35.7R and 41.7R. In our analysis we isolate socalled switchback (SB) intervals (folded magnetic field lines) from nonswitchback (NSB) intervals, which mainly follow the Parker spiral field. Using a technique based on conditioned correlation functions, we estimate the power spectra of Elsasser, magnetic, and bulk velocity fields separately in the SB an ... Bourouaine, Sofiane; Perez, Jean; Klein, Kristopher; Chen, Christopher; Martinovic, Mihailo; Bale, Stuart; Kasper, Justin; Raouafi, Nour; Published by: ASTROPHYSICAL JOURNAL LETTERS Published on: 12/2020 YEAR: 2020 DOI: 10.3847/20418213/abbd4a 
Eulerian spacetime correlation of strong magnetohydrodynamic turbulence Perez, Jean; Bourouaine, Sofiane; Published by: Physical Review Research Published on: 06/2020 YEAR: 2020 DOI: 10.1103/PhysRevResearch.2.023357 Astrophysics  Solar and Stellar Astrophysics; Physics  Plasma Physics; Physics  Space Physics 
Twotime energy spectrum of weak magnetohydrodynamic turbulence In this work a weakturbulence closure is used to determine the structure of the twotime power spectrum of weak magnetohydrodynamic (MHD) turbulence from the nonlinear equations describing the dynamics. The twotime energy spectrum is a fundamental quantity in turbulence theory from which most statistical properties of a homogeneous turbulent system can be derived. A closely related quantity, obtained via a spatial Fourier transform, is the twopoint twotime correlation function describing the spacetime correlations arisi ... Perez, Jean; Azelis, Augustus; Bourouaine, Sofiane; Published by: PHYSICAL REVIEW RESEARCH Published on: 05/2020 YEAR: 2020 DOI: 10.1103/PhysRevResearch.2.023189 
2019 
Reflectiondriven magnetohydrodynamic turbulence in the solar atmosphere and solar wind Chandran, Benjamin; Perez, Jean; Published by: Journal of Plasma Physics Published on: 08/2019 YEAR: 2019 DOI: 10.1017/S0022377819000540 Parker Data Used; astrophysical plasmas; plasma nonlinear phenomena; space plasma physics; Physics  Space Physics; Astrophysics  Solar and Stellar Astrophysics; Physics  Plasma Physics 
On the Interpretation of Parker Solar Probe Turbulent Signals In this Letter we propose a practical methodology to interpret future Parker Solar Probe (PSP) turbulent time signals even when Taylor s hypothesis is not valid. By extending Kraichnan s sweeping model used in hydrodynamics we derive the Eulerian spacetime correlation function in magnetohydrodynamic (MHD) turbulence. It is shown that in MHD, the temporal decorrelation of smallscale fluctuations arises from a combination of hydrodynamic sweeping induced by largescale fluid velocity delta u(0) and by the Alfvenic propagation ... Bourouaine, Sofiane; Perez, Jean; Published by: ASTROPHYSICAL JOURNAL LETTERS Published on: 07/2019 YEAR: 2019 DOI: 10.3847/20418213/ab288a 
2018 
In this Letter, we present an analysis of twopoint, twotime correlation functions from highresolution numerical simulations of Reflectiondriven Alfven Turbulence near the Alfven critical point r e . The simulations model the turbulence in a prescribed background solar wind model chosen to match observational constraints. This analysis allows us to investigate the temporal decorrelation of solar wind turbulence and the validity of Taylor s approximation near the heliocentric distance r(c), which Parker Solar Probe (PSP) i ... Bourouaine, Sofiane; Perez, Jean; Published by: ASTROPHYSICAL JOURNAL LETTERS Published on: 05/2018 YEAR: 2018 DOI: 10.3847/20418213/aabccf 
2015 
A MODIFIED VERSION OF TAYLOR\textquoterightS HYPOTHESIS FOR SOLAR PROBE PLUS OBSERVATIONS The Solar Probe Plus (SPP) spacecraft will explore the nearSun environment, reaching heliocentric distances less than 10 R_{☉ }. Near Earth, spacecraft measurements of fluctuating velocities and magnetic fields taken in the time domain are translated into information about the spatial structure of the solar wind via Taylor\textquoterights \textquotedblleftfrozen turbulence\textquotedblright hypothesis. Near the perihelion of SPP, however, the solarwind speed is comparable to the Alfv\ en speed, and Taylor\text ... Klein, Kristopher; Perez, Jean; Verscharen, Daniel; Mallet, Alfred; Chandran, Benjamin; Published by: The Astrophysical Journal Published on: 03/2015 YEAR: 2015 DOI: 10.1088/20418205/801/1/L18 Astrophysics  Solar and Stellar Astrophysics; Parker Data Used; parker solar probe; Physics  Plasma Physics; Physics  Space Physics; plasmas; Solar Probe Plus; Solar wind; Sun: corona; turbulence 
2013 
Perez, Jean; Chandran, Benjamin; Published by: \apj Published on: 10/2013 YEAR: 2013 DOI: 10.1088/0004637X/776/2/124 Parker Data Used; magnetohydrodynamics: MHD; Solar wind; Sun: corona; turbulence; waves 
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