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Produced by high-speed electrons spiraling through magnetic fields, this mechanism results in a broad spectrum of radiation. It's typically observed in radio galaxies and supernova remnants.

Occurs when high-energy electrons are decelerated or deflected by other charges, emitting radiation. Also known as free-free emission, it is seen in hot, ionized gases like those in H II regions or stellar coronae.

Emission resulting from charged particles accelerating in magnetic fields, typically at low frequencies. It is observed in laboratories and magnetic stars.

A process involving stimulated emission, masers are microwave amplification by stimulated emission of radiation, commonly found in molecular clouds and around active galactic nuclei.

Generated by rapidly rotating neutron stars emitting beams of radiation along their magnetic poles, observed as pulses when the beam sweeps past Earth.

Radio waves produced by the collective effects of plasma instability, often created by solar activity or in the Earth's ionosphere.

Emission like synchrotron radiation but involving mildly relativistic particles, typically observed in solar flares and microbursts in the magnetosphere.

This involves the amplification of radio waves by constructive interference, seen in highly ordered plasma structures.

Originating from the regions close to black holes, these jets emit synchrotron radiation detectable at radio wavelengths, observable in distant radio galaxies and quasars.

A technique that utilizes the Zeeman effect to measure the magnetic field of stars by observing the polarization of radio waves emitted from the stars' surfaces.

Warm objects, such as stars or dust clouds, emit a continuous spectrum of radiation, where peak frequency is related to temperature by Planck's law.

Produced when electrons fall from higher to lower energy states in ionized atoms, observed in ionized nebulae and the interstellar medium.

A global electromagnetic resonance occurring between the Earth's surface and the ionosphere, it is a very low frequency form of natural radio emission.

Occurs when an atom or molecule absorbs a photon and becomes ionized, the excess kinetic energy can be emitted as radio waves. Often seen surrounding hot young stars.