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Dellinger Effect

J. Howard Dellinger National Bureau of Standards - RF CafeThe Dellinger effect, also known as the propagation delay or the interplanetary scintillation (IPS) effect, is a phenomenon related to the interaction of solar eruptions with the interplanetary medium and its impact on radio communications.

Solar eruptions, such as coronal mass ejections (CMEs) and flares, release large amounts of energy and material into space. These events can produce disturbances in the solar wind, which is the constant flow of charged particles from the Sun that permeates the solar system.

When a CME or flare travels through the solar wind, it can create density variations in the plasma that cause radio waves to refract or bend. This bending of radio waves can result in fluctuations in the signal strength and phase, which can lead to radio scintillation and signal fading. This effect can be particularly significant for radio waves that pass through the ionosphere, the uppermost part of the Earth's atmosphere that contains free electrons and ions that can interact with radio waves.

The Dellinger effect is named after Dr. T.S. Dellinger, who first observed this phenomenon in the 1950s. IPS observations have since become an important tool for studying the structure and dynamics of the solar wind and the interplanetary medium, as well as for monitoring space weather and its effects on radio communications.



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