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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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Persistent plasma waves in interstellar space detected by Voyager 1.

Stella Koch Ocker1, James M Cordes1, Shami Chatterjee1

  • 1Department of Astronomy and Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca, NY 14850, USA.

Nature Astronomy
|January 10, 2022
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Summary
This summary is machine-generated.

Voyager 1 detected a new, persistent plasma wave signal, providing the first steady measurements of interstellar plasma density. This breakthrough reveals new details about interstellar turbulence beyond our solar system.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Astrophysics

Background:

  • Voyager 1 is the first probe in the local interstellar medium.
  • Previous plasma density estimates relied on shock-triggered events.
  • Interstellar plasma density measurements have been sparse.

Purpose of the Study:

  • To present a new method for measuring interstellar plasma density.
  • To analyze continuous plasma wave data from Voyager 1.
  • To investigate interstellar turbulence.

Main Methods:

  • Detection of weak, narrowband plasma wave emissions.
  • Continuous sampling of plasma density data.
  • Analysis of au-scale density fluctuations.

Main Results:

  • First steady measurement of interstellar plasma density over 10 au.
  • Identification of au-scale density fluctuations.
  • Observation of persistent plasma wave emission since 2017.

Conclusions:

  • The new emission provides a continuous record of interstellar plasma density.
  • Voyager 1 can track interstellar turbulence without shock events.
  • Further study may clarify emission mechanisms.