Publications by authors named "Jiansen He"
Turbulent energy dissipation is a fundamental process in plasma physics that has not been settled. It is generally believed that the turbulent energy is dissipated at electron scales leading to electron energization in magnetized plasmas. Here, we propose a micro accelerator which could transform electrons from isotropic distribution to trapped, and then to stream (Strahl) distribution.
View Article and Find Full Text PDFImbalanced Alfvénic turbulence is a universal process playing a crucial role in energy transfer in space, astrophysical, and laboratory plasmas. A fundamental and long-lasting question about the imbalanced Alfvénic turbulence is how and through which mechanism the energy transfers between scales. Here, we show that the energy transfer of imbalanced Alfvénic turbulence is completed by coherent interactions between Alfvén waves and co-propagating anomalous fluctuations.
View Article and Find Full Text PDFArticle Synopsis
- The study of electron scales is crucial for understanding plasma behavior in space and astrophysics, specifically in terms of plasma turbulence and energy transfer.
- There is a significant gap in knowledge regarding how plasma electrons contribute to heat flux and its regulation, making it a key area of research.
- This White Paper outlines important scientific questions related to electron processes and proposes new space missions to address these challenges in the fields of space physics and astrophysics.
Article Synopsis
- NASA's Magnetospheric Multi-Scale (MMS) mission investigates the behavior of plasma turbulence, focusing on how particles are accelerated and heated within this environment.
- The study develops a new kinetic theory to understand magnetic cavities, crucial structures for energy dynamics in plasma.
- By using data from multiple MMS spacecraft, researchers can validate their theory through predictive modeling, demonstrating that these magnetic cavities are self-organized structures similar to those observed in laboratory settings.
Understanding many physical processes in the solar atmosphere requires determination of the magnetic field in each atmospheric layer. However, direct measurements of the magnetic field in the Sun's corona are difficult to obtain. Using observations with the Coronal Multi-channel Polarimeter, we have determined the spatial distribution of the plasma density in the corona and the phase speed of the prevailing transverse magnetohydrodynamic waves within the plasma.
View Article and Find Full Text PDFGlycerol kinase has several diverse activities in mammalian cells. Glycerol kinase deficiency is a complex, single-gene, inborn error of metabolism wherein no genotype-phenotype correlation has been established. Since glycerol kinase has been suggested to exhibit additional activities than glycerol phosphorylation, expression level perturbation in this enzyme may affect cellular physiology globally.
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