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Momentum And Radiation Pressure01:20

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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
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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 most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
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The electromagnetic spectrum consists of all the types of electromagnetic radiation arranged according to their frequency and wavelength. Each of the various colors of visible light has specific frequencies and wavelengths associated with them, and you can see that visible light makes up only a small portion of the electromagnetic spectrum. Because the technologies developed to work in various parts of the electromagnetic spectrum are different, for reasons of convenience and historical...
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Anomalous Cosmic Rays and Heliospheric Energetic Particles.

J Giacalone1, H Fahr2, H Fichtner3

  • 1Lunar & Planetary Laboratory, University of Arizona, Tucson, AZ 85721 USA.

Space Science Reviews
|May 3, 2022
PubMed
Summary
This summary is machine-generated.

Anomalous Cosmic Rays (ACRs) are reviewed, covering their discovery, acceleration, and transport within the heliosphere. A new, more descriptive term, "Heliospheric Energetic Particles," is proposed for broader understanding.

Keywords:
Cosmic ray transportCosmic raysHeliosphereParticle accelerationPickup ionsShocks

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Area of Science:

  • Space Physics
  • Astrophysics
  • Heliophysics

Background:

  • Anomalous Cosmic Rays (ACRs) are a distinct component of galactic cosmic rays.
  • Their origin and propagation within the heliosphere have been subjects of extensive research.

Purpose of the Study:

  • To provide a comprehensive review of Anomalous Cosmic Rays.
  • To discuss recent advancements in understanding ACR acceleration and transport.
  • To propose a more descriptive terminology for these particles.

Main Methods:

  • Literature review of historical and recent studies on ACRs.
  • Analysis of observational data and theoretical models.
  • Discussion of physical processes governing ACR behavior.

Main Results:

  • Detailed overview of ACR discovery, acceleration mechanisms, and heliospheric transport.
  • Insights into ACR escape from the heliosphere and effects on the heliosheath.
  • Examination of solar cycle dependence and inner heliosphere propagation.

Conclusions:

  • Significant progress has been made in understanding ACRs.
  • The term "Anomalous Cosmic Ray" may not be fully descriptive for non-specialists.
  • The term "Heliospheric Energetic Particles" is suggested as a more appropriate and encompassing descriptor.