A5069466886- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Laser-induced spectroscopy and plasma
- Earthquake Detection and Analysis
- Visual perception and processing mechanisms
- Plasma Diagnostics and Applications
- Refrigeration and Air Conditioning Technologies
- Cyclone Separators and Fluid Dynamics
- Muon and positron interactions and applications
- Magnetic and Electromagnetic Effects
- Color perception and design
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Consumer Packaging Perceptions and Trends
- Smart Materials for Construction
- Hydraulic and Pneumatic Systems
- Climate change and permafrost
- Corporate Governance and Law
- Fluid Dynamics and Turbulent Flows
- Consumer Behavior in Brand Consumption and Identification
- Taxation and Legal Issues
- EU Law and Policy Analysis
- Neutrino Physics Research
Swedish Institute of Space Physics
2015-2019
Uppsala University
1964-2019
Collisionless space plasma turbulence can generate reconnecting thin current sheets as suggested by recent results of numerical magnetohydrodynamic simulations. The MMS mission provides the first serious opportunity to check if small ion-electron-scale reconnection, generated turbulence, resembles reconnection events frequently observed in magnetotail or at magnetopause. Here we investigate field and particle observations obtained fleet turbulent terrestrial magnetosheath behind...
Abstract In this paper we use the full armament of MMS (Magnetospheric Multiscale) spacecraft to study magnetic reconnection in turbulent magnetosheath downstream a quasi‐parallel bow shock. Contrarily magnetopause and magnetotail cases, only few observations have been reported. The case presents, for first time, both fluid‐scale kinetic‐scale signatures an ongoing magnetosheath. are crossing inflow outflow regions ion diffusion region (IDR). Inside outflows D shape distributions observed....
Abstract A magnetic reconnection event detected by Cluster is analyzed using three methods: Single‐spacecraft Inference based on Flow‐reversal Sequence (SIFS), Multispacecraft Timing a Structure (MITS), and the First‐Order Taylor Expansion (FOTE). Using SIFS method, we find that structure an X line; while MITS FOTE methods, it island (O line). We compare efficiency accuracy of these methods most efficient accurate approach to identify FOTE. In both guide nonguide field regimes, method...
Abstract We present Magnetospheric Multiscale observations of an electron‐scale current sheet and electron outflow jet for asymmetric reconnection with guide field at the subsolar magnetopause. The observed within region has Mach number 0.35 is associated agyrotropy. unstable to electrostatic instability which generates intense waves E ∥ amplitudes reaching up 300 mV m −1 potentials 20% thermal energy. see evidence interaction between beam, leading quick thermalization beam stabilization...
Abstract We present a statistical study of coherent structures at kinetic scales, using data from the Magnetospheric Multiscale mission in Earth’s magnetosheath. implemented multi-spacecraft partial variance increments (PVI) technique to detect these structures, which are associated with intermittency scales. examine properties electron heating occurring within such structures. find that, statistically, high PVI index regions significant heating. also focus on one structure, current sheet,...
We use kinetic particle-in-cell and magnetohydrodynamic simulations supported by an observational dataset to investigate magnetic reconnection in clusters of null points space plasma. The configuration under investigation is driven fast adiabatic flux rope compression that dissipates almost half the initial field energy. In this phase powerful currents are excited producing secondary instabilities, system brought into a state `intermittent turbulence' within few ion gyro-periods....
Abstract Localized kinetic‐scale regions of strong current are believed to play an important role in plasma thermalization and particle acceleration turbulent plasmas. We present a detailed study localized current, 4900 nA m −2 , located at fast jet observed the magnetosheath downstream quasi‐parallel shock. The thickness region is ∼3 ion inertial lengths forms boundary separating magnetosheath‐like solar wind‐like On scales has shape sheet with significant average normal magnetic field...
Abstract We present observations of electron energization within a sub‐ion‐scale magnetosheath current sheet (CS). A number signatures indicate ongoing reconnection, including the thickness CS (∼0.7 ion inertial length), nonzero normal magnetic field, Hall fields with electrons carrying currents, and heating. observe localized acceleration heating parallel to field at edges CS. Electrostatic waves observed in these regions have low phase velocity small wave potentials thus cannot provide...
Abstract The electron dynamics within thin current sheets plays a key role both for the process of magnetic reconnection and other energy transfer mechanisms but, from an observational point view, is not well understood. In this paper we report observations reconnecting sheet with intermediate guide field B G =0.5 in , where amplitude inflow regions. width comparable to spatial scales. It shows bifurcated structure embedded magnetopause layer thickness several ion scale has strong...
Abstract Complex magnetic topologies are ubiquitous in astrophysical plasmas. Analyzing nulls, regions of vanishing field, is one way to characterize 3‐D topologies. Magnetic nulls believed be important reconnection and turbulence. In the vicinity a null, plasma particles become unmagnetized can accelerated high energies by electric fields. We present first statistical study occurrence their types Earth's nightside magnetosphere. able identify both tail magnetopause current sheets. On...
Some experiments inspired by the concept of texture gradient were performed with three independent variables: size elements, distance between and retinal area. The dependent variable was perceived slant a surface. All data deviate from those expected on basis concept. An earlier interaction hypothesis has been found to agree rather well data. theoretical problems concerning cue contra theory are discussed.
Abstract We study Magnetospheric MultiScale observations in the outflow region of magnetotail reconnection. estimate power density converted via three fundamental electron acceleration mechanisms: Fermi, betatron, and parallel electric fields. The dominant mechanism, both on average peak values, is Fermi with a about +200 pW/m 3 . magnetic field curvature during most intense comparable to gyroradius, consistent efficient scattering. densities due betatron are factor lower than that for...
The perceived shape of a circle and ellipse has been studied as influenced by the size figure, reference frame, contrast intensity. It was found that these factors have systematic influence upon form perception. data are considered within context slant invariance hypothesis interpreted providing evidence against this applied to proximal form.