447 citations · 2.3k across the 29 of their papers we have counts for
30 papers
Embedded coherent structures from MHD to sub-ion scales in turbulent solar wind at 0.17 au
Alexander Vinogradov, Olga Alexandrova, Pascal Démoulin +6
We study intermittent coherent structures in solar wind magnetic turbulence from MHD to kinetic plasma scales using Parker Solar Probe data during its first perihelion (at 0.17 au)…
Spectrum of kinetic plasma turbulence at 0.3-0.9 astronomical units from the Sun
Olga Alexandrova, Vamsee Krishna Jagarlamudi, Petr Hellinger +3
We investigate spectral properties of turbulence in the solar wind that is a weakly collisional astrophysical plasma, accessible to in-situ observations. Using the Helios search co…
Coherent events at ion scales in the inner Heliosphere: \textit{Parker Solar Probe} observations during the first Encounter
Denise Perrone, Roberto Bruno, Raffaella D'Amicis +7
\textit{Parker Solar Probe} has shown the ubiquitous presence of strong magnetic field deflections, namely switchbacks, during its first perihelion where it was embedded in a highl…
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…
Magnetic field turbulence in the solar wind at sub-ion scales: in situ observations and numerical simulations
L. Matteini, L. Franci, O. Alexandrova +5
We investigate the transition of the solar wind turbulent cascade from MHD to sub-ion range by means of a detail comparison between in situ observations and hybrid numerical simula…
Whistler Waves and Electron Properties in the Inner Heliosphere: Helios Observations
Vamsee Krishna Jagarlamudi, Olga Alexandrova, Laura Bercic +4
We present the analysis of narrowband whistler wave signatures observed in the inner heliosphere (0.3-1 au). These signatures are bumps in the spectral density in the 10-200 Hz fre…
Observational quantification of three-dimensional anisotropies and scalings of space plasma turbulence at kinetic scales
Tieyan Wang, Jiansen He, Olga Alexandrova +2
A statistical survey of spectral anisotropy of space plasma turbulence is performed using five years measurements from MMS in the magnetosheath. By measuring the five-point second-…
Kinetic turbulence in space plasmas observed in the near-Earth and near-Sun solar wind
Olga Alexandrova, Vamsee Krishna Jagarlamudi, Claudia Rossi +4
Turbulence develops in any stressed flow when the scales of the forcing are much larger than those of the dissipation. In neutral fluids, it consists of chaotic motions in physical…
A Case for Electron-Astrophysics
Daniel Verscharen, Robert T. Wicks, Olga Alexandrova +27
A grand-challenge problem at the forefront of physics is to understand how energy is transported and transformed in plasmas. This fundamental research priority encapsulates the con…
Three-dimensional local anisotropy of velocity fluctuations in the solar wind
Andrea Verdini, Roland Grappin, Olga Alexandrova +4
We analyse velocity fluctuations in the solar wind at magneto-fluid scales in two datasets, extracted from Wind data in the period 2005-2015, that are characterised by strong or we…
[Plasma 2020 Decadal] Multipoint Measurements of the Solar Wind: A Proposed Advance for Studying Magnetized Turbulence
K. G. Klein, O. Alexandrova, J. Bookbinder +21
A multi-institutional, multi-national science team will soon submit a NASA proposal to build a constellation of spacecraft to fly into the near-Earth solar wind in a swarm spanning…
Magnetospheric Multiscale Observation of Kinetic Signatures in the Alfvén Vortex
Tieyan Wang, Olga Alexandrova, Denise Perrone +9
Alfvén vortex is a multi-scale nonlinear structure which contributes to intermittency of turbulence. Despite previous explorations mostly on the spatial properties of the Alfvén vo…
A local approach to the study of energy transfers in incompressible magnetohydrodynamic turbulence
Denis Kuzzay, Olga Alexandrova, Lorenzo Matteini
We present a local approach to the study of scale-to-scale energy transfers in magnetohydrodynamic (MHD) turbulence. This approach is based on performing local averages of the phys…
3D Anisotropy of Solar Wind Turbulence, Tubes, or Ribbons?
Andrea Verdini, Roland Grappin, Olga Alexandrova +1
We study the anisotropy with respect to the local magnetic field of turbulent magnetic fluctuations at magnetofluid scales in the solar wind. Previous measurements in the fast sola…
Variability Of The Magnetic Field Power Spectrum In The Solar Wind At Electron Scales
Owen Roberts, Olga Alexandrova, Primoz Kajdic +4
At the electron scales the power spectrum of solar-wind magnetic fluctuations can be highly variable and the dissipation mechanisms of the magnetic energy into the various particle…
Anisotropies of the magnetic field fluctuations at kinetic scales in the solar wind : Cluster observations
Catherine Lacombe, Olga Alexandrova, Lorenzo Matteini
We present the first statistical study of the anisotropy of the magnetic field turbulence in the solar wind between 1 and 200Hz, i.e. from proton to sub-electron scales. We conside…
Coherent structures at ion scales in fast solar wind: {\it Cluster} observations
D. Perrone, O. Alexandrova, O. W. Roberts +5
We investigate the nature of magnetic turbulent fluctuations, around ion characteristic scales, in a fast solar wind stream, by using {\it Cluster} data. Contrarily to slow solar w…
Gyrokinetic theory of magnetic structures in high-beta plasmas of the Earths magnetopause and of the slow solar wind
Dusan Jovanovic, Olga Alexandrova, Milan Maksimovic +1
Nonlinear effects of the trapping of resonant particles by the combined action of the electric field and the magnetic mirror force is studied using a gyrokinetic description that i…
Fluid theory of coherent magnetic vortices in high-beta space plasmas
Dusan Jovanovic, Olga Alexandrova, Milan Maksimovic +1
In-situ observations in the Earth's and Saturn's magnetosheaths and in the solar wind reveal the presence of Alfvén vortices as intermittent structures in the range of scales from…
Suprathermal electron strahl widths in the presence of narrow-band whistler waves in the solar wind
P. Kajdic, O. Alexandrova, M. Maksimovic +2
We perform the first statistical study of the effects of the interaction of suprathermal electrons with narrow-band whistler mode waves in the solar wind. We show that this interac…
Observation of an MHD Alfvén vortex in the slow solar wind
Owen Wyn Roberts, Xing Li, Olga Alexandrova +1
In the solar wind, magnetic field power spectra usually show several power-laws. In this paper, magnetic field data from the Cluster mission during an undisturbed interval of slow…
Coherent events and spectral shape at ion kinetic scales in the fast solar wind turbulence
Sonny Lion, Olga Alexandrova, Arnaud Zaslavsky
In this paper we investigate spectral and phase coherence properties of magnetic fluctuations in the vicinity of the spectral transition from large, magnetohydrodynamic (MHD) to su…
Whistler mode waves and the electron heat flux in the solar wind: Cluster observations
Catherine Lacombe, Olga Alexandrova, Lorenzo Matteini +5
The nature of the magnetic field fluctuations in the solar wind between the ion and electron scales is still under debate. Using the Cluster/STAFF instrument, we make a survey of t…
Solar Wind Turbulence and the Role of Ion Instabilities
Olga Alexandrova, Christopher H. K. Chen, Luca Sorriso-Valvo +2
Solar wind is probably the best laboratory to study turbulence in astrophysical plasmas. In addition to the presence of magnetic field, the differences with neutral fluid isotropic…