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Related Concept Videos

Travelling Waves01:04

Travelling Waves

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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.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is...
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Propagation of Waves01:07

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Electromagnetic Waves01:30

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James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
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Shock Waves01:16

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While deriving the Doppler formula for the observed frequency of a sound wave, it is assumed that the speed of sound in the medium is greater than the source's speed through it. When this condition is breached, a shock wave occurs.
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Standing Electromagnetic Waves01:15

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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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Electromagnetic Waves in Matter01:30

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Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the medium, μ.
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First Hard X-Ray Imaging Results by Solar Orbiter STIX.

Solar physics·2022
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Related Experiment Video

Updated: Mar 17, 2026

Mechanical Stimulation-induced Calcium Wave Propagation in Cell Monolayers: The Example of Bovine Corneal Endothelial Cells
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Mechanical Stimulation-induced Calcium Wave Propagation in Cell Monolayers: The Example of Bovine Corneal Endothelial Cells

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Large-scale Globally Propagating Coronal Waves.

Alexander Warmuth1

  • 1Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany.

Living Reviews in Solar Physics
|July 30, 2016
PubMed
Summary

Globally propagating coronal waves, observed since the 1960s, are debated as either MHD waves or pseudo-waves from CMEs. Recent data analysis is helping to resolve this debate and understand these solar disturbances.

Area of Science:

  • Solar physics
  • Plasma physics
  • Astrophysics

Background:

  • Large-scale, wave-like disturbances in the solar chromosphere and corona have been observed since the 1960s.
  • Detailed analysis became possible in the late 1990s due to high-cadence, space-based coronal imaging.
  • These phenomena, often called coronal waves, appear as globally propagating bright fronts.

Approach:

  • Reviewing observational findings from the last 1.5 decades.
  • Constraining theoretical models of large-scale coronal waves.
  • Synthesizing data to understand the physical nature of these disturbances.

Key Points:

  • Coronal waves are observed across various spectral channels, providing extensive data.
  • Findings support both the classical interpretation (fast-mode MHD waves/shocks) and alternative models (pseudo-waves from CMEs).
Keywords:
CoronaMagnetohydrodynamics (MHD)Waves

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  • A vigorous debate exists regarding the physical nature of these solar disturbances.

    • Conclusions:

    • Numerous observational findings are crucial for refining models of coronal waves.
    • A coherent physical understanding of these large-scale solar disturbances is emerging.
    • Distinguishing between MHD waves and pseudo-waves is key to advancing solar physics research.