Dellinger Effect

Electronics & Technology
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The 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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While working on an update to my RF Cafe Espresso Engineering Workbook project to add a couple calculators about FM sidebands (available soon). The good news is that AI provided excellent VBA code to generate a set of Bessel function plots. The bad news is when I asked for a table showing at which modulation indices sidebands 0 (carrier) through 5 vanish, none of the agents got it right. Some were really bad. The AI agents typically explain their reason and method correctly, then go on to produces bad results. Even after pointing out errors, subsequent results are still wrong. I do a lot of AI work and see this often, even with subscribing to professional versions. I ultimately generated the table myself. There is going to be a lot of inaccurate information out there based on unverified AI queries, so beware.