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Electromagnetic Radiation Spectrum of a Composite System.

Ningyu Liu1, Joseph R Dwyer1, Julia N Tilles1

  • 1Department of Physics and Astronomy & Space Science Center (EOS), The University of New Hampshire, Durham, New Hampshire 03824, USA.

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This study presents a theory for radio emission from composite systems. The theory explains how the electromagnetic radiation spectrum depends on the number and properties of individual sources, with low frequencies being much stronger.

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Area of Science:

  • Physics
  • Electromagnetism
  • Astrophysics

Background:

  • Composite systems with numerous random emission sources are common in physics.
  • These systems often persist longer than individual components, which exhibit rapid current variations.

Purpose of the Study:

  • To develop a theoretical framework for understanding the electromagnetic radiation spectrum of composite emission systems.
  • To provide a method for calculating the spectrum based on source occurrence and property distributions.

Main Methods:

  • The study introduces a new theory for analyzing the composite system's radiation spectrum.
  • The theory utilizes the temporal distribution of component occurrence and source property distributions.

Main Results:

  • The derived spectrum comprises two main terms: one from coherent summation (proportional to N^2) and one from incoherent summation (proportional to N).
  • This leads to significantly different spectral magnitudes across different frequency regions.

Conclusions:

  • The theory enables the calculation of the composite system's electromagnetic radiation spectrum.
  • Low-frequency radio emission is typically orders of magnitude stronger than high-frequency emission in such systems.