Search Publications
Multi-Spacecraft Magnetic Field Reconstructions: A Cross-Scale Comparison of Methods
Klein, K. G.; Broeren, T.; TenBarge, J. M.
Space plasma studies frequently use in situ magnetic field measurements taken from many spacecraft simultaneously. A useful data product of these measurements is the reconstructed magnetic field in a volume near the spacecraft observatory. We compare a standard Linear method of computing the magnetic field at arbitrary spatial points to two novel …
A Database for Simultaneous Observations of the Earth's Magnetosheath by Cluster and MMS Between 2017 and 2021
Voitcu, Gabriel; Echim, Marius; Munteanu, Costel +4 more
This paper describes a catalog of simultaneous observations of the Earth's magnetosheath by ESA's Cluster and NASA's MMS missions. The catalog is built from a visual inspection of summary plots provided by the two missions complemented by an analysis of high-resolution magnetic field data. The catalog includes 117 events when Cluster 4 and MMS 4 c…
An Integrated Nonlinear Analysis (INA) Software for Space Plasma Turbulence
Echim, Marius; Munteanu, Costel; Kovács, Péter
We built an integrated nonlinear analysis software (INA)-designed to study space plasma turbulence and intermittency. The MATLAB programming environment was used for the algorithmic development and implementation of methods for spectral analysis, multiscale fluctuations and multifractal analysis. The performance of INA is demonstrated using magnet…
Classifying Interplanetary Discontinuities Using Supervised Machine Learning
Munteanu, Costel; Dumitru, Daniel
Directional discontinuities (DDs) are defined as abrupt changes of the magnetic field orientation. We use observations from ESA's Cluster mission to compile a database of events: Four thousand two hundred and sixteen events are identified in January-April 2007, and 5,194 in January-April 2008. Localized time scale images depicting angular changes …
Compiling Magnetosheath Statistical Data Sets Under Specific Solar Wind Conditions: Lessons Learnt From the Dayside Kinetic Southward IMF GEM Challenge
Dimmock, A. P.; Hietala, H.; Zou, Y.
The Geospace Environmental Modelling (GEM) community offers a framework for collaborations between modelers, observers, and theoreticians in the form of regular challenges. In many cases, these challenges involve model-data comparisons to provide wider context to observations or validate model results. To perform meaningful comparisons, a statisti…
Open-Source Software Analysis Tool to Investigate Space Plasma Turbulence and Nonlinear DYNamics (ODYN)
Echim, M. M.; Teodorescu, E.
We have designed and built a versatile modularized software library—ODYN—that wraps a comprehensive set of advanced data analysis methods meant to facilitate the study of turbulence, nonlinear dynamics, and complexity in space plasmas. The Python programming language is used for the algorithmic implementation of models and methods devised to under…
Robust Adaptive Spacecraft Array Derivative Analysis
Vogt, J.; Blagau, A.; Pick, L.
Multispacecraft missions such as Cluster, Themis, Swarm, and MMS contribute to the exploration of geospace with their capability to produce gradient and curl estimates from sets of spatially distributed in situ measurements. This paper combines all existing estimators of the reciprocal vector family for spatial derivatives and their errors. The re…
Intermittency in Solar Wind Turbulence From Fluid to Kinetic Scales
Bruno, Roberto
Solar wind is a highly turbulent medium exhibiting fluctuations ranging from the solar sidereal rotation period to proton and electron gyroperiods. Their amplitudes show remarkable scalings with frequency across more than seven decades, suggesting a self-similar nature for these fluctuations. However, these fluctuations are not globally scale inva…