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Related Experiment Video

Updated: Sep 11, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Published on: March 2, 2021

Quantification of ion scattering by solar-wind current sheets: Pitch-angle diffusion rates.

Zijin Zhang¹, Anton V Artemyev¹, Vassilis Angelopoulos¹

¹University of California, Los Angeles, Department of Earth, Planetary, and Space Sciences, California, USA.

Physical Review. E

|August 19, 2025

Summary

Solar wind current sheets significantly scatter energetic particles, influencing their heliospheric transport. This study quantifies this effect using realistic models, improving space plasma simulations.

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Last Updated: Sep 11, 2025

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Scattering And Absorption of Light in Planetary Regoliths

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Published on: July 1, 2019

Area of Science:

Space Physics
Plasma Physics
Astrophysics

Background:

Energetic particle transport in the heliosphere is affected by solar wind turbulence.
Previous models often used idealized turbulence, neglecting coherent structures like current sheets.

Purpose of the Study:

To quantify the role of solar wind current sheets in driving energetic particle pitch-angle scattering.
To develop a framework for incorporating current sheet effects into particle transport models.

Main Methods:

Developed an analytical Hamiltonian framework and test particle simulations.
Incorporated observational data from ARTEMIS and Wind missions.
Modeled particle dynamics through current sheets with realistic parameters.

Main Results:

Scattering efficiency depends on current sheet shear angle, normal magnetic field component, and particle gyroradius to sheet thickness ratio.
Observed large pitch-angle jumps and diffusive scattering.
Found significant scattering rates for 100 keV to 1 MeV protons at 1 AU.

Conclusions:

Solar wind current sheets are crucial for energetic particle scattering and transport in the heliosphere.
Derived diffusion rates allow for more accurate global transport models.
Highlights the importance of coherent structures in space and astrophysical plasmas.