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The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
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The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Nine Outstanding Questions of Solar Wind Physics.

Nicholeen M Viall1, Joseph E Borovsky2

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PubMed
Summary
This summary is machine-generated.

Solar wind research has advanced significantly, yet major questions remain about its origin, properties, and evolution. This commentary outlines nine key questions and suggests future research directions using new observational data and simulations.

Keywords:
outstanding problems of the solar wind

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Solar Physics

Background:

  • Solar wind in situ measurements and simulations have advanced our understanding of space plasma physics.
  • Despite progress, fundamental questions regarding solar wind formation, properties, and evolution persist.

Purpose of the Study:

  • To synthesize community input and identify nine outstanding questions in solar wind physics.
  • To propose future research directions for addressing these critical questions.

Main Methods:

  • Community-driven synthesis of outstanding research questions.
  • Review of current observational and simulation capabilities.
  • Forward-looking analysis of upcoming missions and instruments.

Main Results:

  • Nine key questions are detailed, covering solar wind origin, plasma release, acceleration, composition, magnetic structure, waves, turbulence, distribution functions, and particle transport.
  • Suggestions for future progress are provided, emphasizing the roles of Parker Solar Probe, Solar Orbiter, DKIST, and PUNCH.

Conclusions:

  • Addressing these nine questions requires improved measurements, higher-resolution simulations, and advances in plasma physics theory.
  • Future missions and instruments are poised to make significant contributions to solar wind research.