Electromagnetic radiation > Related Articles
From Citizendium, the Citizens' Compendium
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Parent topics
- Photon [r]: elementary particle with zero rest mass and unit spin associated with the electromagnetic field. [e]
- Frequency [r]: For a periodic (i.e., repeating) phenomena, the number of repetitions per unit of time, usually one second; measured in Hertz [e]
- ITU Frequency Bands [r]: Add brief definition or description
- IEEE Frequency Bands [r]: Add brief definition or description
- Radio [r]: Transmission and reception of information, which can be voice, data or imagery over electromagnetic radiation in free space (i.e., wireless). The information is modulated onto a carrier wave [e]
- Infrared light [r]: In physics and engineering, a non-visible portion of the electromagnetic spectrum ranging from wavelengths of 750 nm to 1 mm, between the darkest visible red and the shortest submillimeter wave radar [e]
- Visible light [r]: Electromagnetic radiation of a wavelength that is detectable by the human eye. [e]
- Ultraviolet light [r]: Add brief definition or description
- X-rays [r]: Add brief definition or description
- Gamma rays [r]: Add brief definition or description
Subtopics
- Carrier wave [r]: In electromagnetic signal transmission, the basic information-free signal onto which information is modulated. [e]
- Modulation [r]: The process of varying one waveform in relation to another waveform. [e]
- Amplitude modulation [r]: Changing the height of the peaks of a periodic waveform, such as a radio wave, to carry information. [e]
- Frequency modulation [r]: Technique for imposing information onto a electromagnetic signal of constant frequency -- the "carrier wave". [e]
- Superheterodyne [r]: A form of reception in which the frequency of an incoming signal is mixed with a locally generated signal and converted to an intermediate frequency in order to facilitate amplification and the rejection of unwanted signals. [e]
- Operation RAFTER [r]: A measurement and signature intelligence (MASINT) technique that allowed a remote monitor to determine, passively, the frequency to which a radio receiver was tuned; revelation of the technique allowed it to be prevented [e]
- Electromagnetic wave [r]: a change, periodic in space and time, of an electric field E(r,t) and a magnetic field B(r,t); a stream of electromagnetic waves, referred to as electromagnetic radiation, can be seen as a stream of massless elementary particles, named photons. [e]
- Electromagnetism [r]: Phenomena and theories regarding electricity and magnetism. [e]
- Ionizing radiation [r]: Subatomic particles or electromagnetic waves that are energetic enough to detach electrons from atoms or molecules, ionizing them. [e]
Other related topics
- Acute radiation syndrome [r]: Disease or death caused by whole-body irradiation, over a short period of time, with a significant quantity of penetrating radiation [e]
Bot-suggested topics
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- AC-130 [r]: Heavily armed transport aircraft, based on the C-130 Hercules, used to provide air support to special operations forces. [e]
- Air Traffic Control [r]: A system for managing the safe operation of large numbers of aircraft in shared airspace, day or night, and in almost all weather, keeping the aircraft managed by positive control from a network of interconnected ground stations [e]
- Astronomy [r]: The study of objects and processes in the observable universe, e.g. stars, planets, comets or asteroids. [e]
- Automatic Identification System [r]: A system, aboard ships and boats, that combines marine radio transmitters and receivers, Global Navigation Satellite System receivers, and computer control into a self-organizing, mobile network in which vessels are inform nearby traffic, potential collision hazards, and navigational information [e]
- BBC [r]: British state-owned radio and TV broadcasting organization founded in 1922 under Lord John Reith. [e]
- Boson [r]: elementary particle with integral spin; composite system consisting of an even number of fermions. [e]
- Bremsstrahlung [r]: Electromagnetic radiation produced by the acceleration of a charged particle, such as an electron, when deflected by another charged particle, such as an atomic nucleus. [e]
- Chemistry [r]: The science of matter, or of the electrical or electrostatical interactions of matter. [e]
- Communications intelligence [r]: The subset of SIGINT concerned with signals intended to be intelligible to human beings, in the form of voice, messages, or images. [e]
- Computer network [r]: A collection of computers or digital devices ("nodes") connected by communication links. [e]
- Counterproliferation [r]: The set of activities that detect and monitor the threat of weapons of special concern against one's own nation and one's allies. [e]
- Cryptology [r]: The theory and practice of protecting the content of communications, and of defeating the protective measures [e]
- DNA [r]: A macromolecule that stores genetic information. Chemically, a nucleic acid. [e]
- Digital selective calling [r]: A method to address specific marine radios or groups of vessels, and to send a distress signal, including the vessel's location if the radio is connected to a GPS receiver [e]
- EC-130 COMMANDO SOLO [r]: C-130 Hercules aircraft variant with transmitters for psychological operations and communications jamming. [e]
- Electrical engineering [r]: The branch of engineering that deals primarily with electricity and electromagnetism. [e]
- Electro-optical MASINT [r]: A subdiscipline of measurement and signature intelligence (MASINT), which has similarities to but complements imagery intelligence (IMINT); it does not form images, but validates them and produces information on phenomena that emit, absorb, or reflect electromagnetic energy in the infrared, visible light, or ultraviolet spectra, where the value is knowledge of the type of energy detected [e]
- Electromagnetic pulse [r]: An intense burst of electromagnetic (EM) energy caused by an abrupt, rapid acceleration of charged particles, usually electrons. [e]
- Electronic warfare [r]: A subset of information operations that deals with the use of electromagnetic or kinetic means to degrade an enemy's military electronics systems, to be able to operate one's own electronics in the face of enemy attacks, and to evade those attacks through protection or deception [e]
- Emergency Position Indicating Radio Beacon [r]: Intended for search and rescue of ships and boats, this is a beacon that will float free of a sinking vessel, and broadcast a position report, preferably with GPS, to a worldwide cluster of monitoring satellites. [e]
- Food and Drug Administration [r]: The agency of the United States Department of Health and Human Services responsible for regulating food, dietary supplements, drugs, biological medical products, blood products, medical devices, radiation-emitting devices, veterinary products, and cosmetics. [e]
- Geophysical MASINT [r]: A branch of measurement and signature intelligence that involves phenomena transmitted through the earth (ground, water, atmosphere) and manmade structures including emitted or reflected sounds, pressure waves, vibrations, and magnetic field or ionosphere disturbances. [e]
- Global Maritime Distress and Safety System [r]: Mandated by the Safety of Life at Sea convention of the International Maritime Organization system of digital radio and other systems for ships to receive alerts and signal search and rescue organizations when they are in distress. [e]
- Global warming [r]: The increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation. [e]
- Go-onto-location-in-space [r]: A weapons guidance paradigm in which the weapon guides itself to a specific set of geographic coordinates and activates its warhead, rather than sensing and tracking a target [e]
- Guglielmo Marconi [r]: (1874 - 1937) Italian inventor and pioneer of radio communication. [e]
- HAVE QUICK II [r]: A family of military UHF jam-resistant radios, intended for air-to-air and air-to-ground use [e]
- Heat [r]: A form of energy that flows spontaneously from hotter to colder bodies that are in thermal contact. [e]
- Immunology [r]: The study of all aspects of the immune system in all animals. [e]
- Information security [r]: The set of policies and protective measures used to ensure appropriate confidentiality, integrity and availability to information; usually assumed to be information in a computer or telecommunications network but the principles extend to people and the physical world [e]
- Inverse-square law [r]: A physical law stating that some physical quantity or strength is inversely proportional to the square of the distance from the source of that physical quantity. [e]
- Joint Tactical Information Distribution System [r]: The primary communications system used for sharing tactical information internally, and among NATO, Australia, and other U.S. allies [e]
- Led Zeppelin Radio [r]: A commercial-free, satellite radio station on the XM Satellite Radio platform, broadcasting the music of Led Zeppelin. [e]
- Lightning [r]: An atmospheric discharge of electricity accompanied by thunder, which typically occurs during thunderstorms, and sometimes during volcanic eruptions or dust storms. [e]
- Light [r]: The part of the electromagnetic spectrum visible to a species' biological eye. [e]
- Marine navigation [r]: A term including the literal process of navigation, or finding position and course, but of the overall process of safe operation of a water vessel, such as avoiding collisions [e]
- Materials MASINT [r]: A discipline involving the measurement of signatures from the collection, processing, and analysis of gas, liquid, or solid samples; it complements technical intelligence: a technical intelligence analyst would work with a captured example of the weapon, or at least pieces of it, to come to that understanding of the propellant, while an analyst of this technique would infer the propellant through analysis of the exhaust [e]
- Measurement and signature intelligence [r]: A variety of intelligence gathering disciplines complementary to the technical "mainstream" of imagery intelligence and signals intelligence. [e]
- Memory of water [r]: A pseudoscientific concept, according to which water molecules can store information on the kind of molecules they had been in contact with. [e]
- Michael Faraday [r]: (1791 – 1867) Was an English physicist and chemist whose best known work was on the closely connected phenomena of electricity and magnetism; his discoveries lead to the electrification of industrial societies. [e]
- Planck's constant [r]: The constant of proportionality relating the energy of a photon to the frequency of that photon, named sfter Max Karl Ernst Ludwig Planck. [e]
- Popular culture [r]: Commercialised folk culture that exists for the masses; opposite of high culture. [e]
- Quantum mechanics [r]: An important branch of physics dealing with the behavior of matter and energy at very small scales. [e]
- RNA world hypothesis [r]: Proposes that a world filled with life based on ribonucleic acid (RNA) predated current life based on deoxyribonucleic acid (DNA). [e]
- Radar MASINT [r]: The use of radar signals to obtain information beyond imaging of a target or its simple position, such as motion, reflectivity and surface characteristics, etc.; this technical information may be combined with imaging radar or traditional tracking radar [e]
- Radar [r]: A contraction of radio direction and ranging, used for detecting and tracking targets, navigation, imagery, and special applications. [e]
- Radiation [r]: Transmission of energy through space. [e]
- Radiofrequency MASINT [r]: Collection and processing of intelligence information derived from unintentional electromagnetic radiation from targets of interest [e]
- Radio [r]: Transmission and reception of information, which can be voice, data or imagery over electromagnetic radiation in free space (i.e., wireless). The information is modulated onto a carrier wave [e]
- Redshift [r]: A term used in Astronomy and Physics to refer to the phenomenon by which electromagnetic radiation's observed wavelength increases, thereby causing an apparent decrease in the observed frequency. [e]
- SIGINT before the Second World War [r]: Add brief definition or description
- SIGINT from 1945 to 1989 [r]: Add brief definition or description
- SIGINT ground-based platforms [r]: Fixed, transportable or mobile facilities, on land, which contain signals intelligence sensors [e]
- SIGINT in the Second World War [r]: Add brief definition or description
- SIGINT ship-based platforms [r]: Signals intelligence collection systems mounted on surface ships [e]
- SIGINT space-based platforms [r]: Add brief definition or description
- Safety and survivability of naval vessels [r]: Beyond the rules of the Safety of Life at Sea convention, protective measures, for naval vessels, against their own systems as well as enemy fire [e]
- Satellite communications [r]: Telecommunications that makes use of a high-altitude relay(s), usually artificial satellites in Earth orbits but potentially a relay in the atmosphere [e]
- Science fiction [r]: A story-telling genre that presents alternatives to what is currently considered scientifically possible or that extrapolates from present-day knowledge. [e]
- Signals intelligence from 1990 to the present [r]: Technology and history of signals intelligence from 1990 to the present time [e]
- Signals intelligence [r]: the practice of acquiring information through monitoring the electromagnetic signals deliberately trasmitted by an opponent, including communications (COMINT) and non-communications electronics such as radar (ELINT). [e]
- Solar system [r]: The sun and the planets orbiting it. [e]
- Speed of light [r]: Is in vacuum c ≡ 299 792 458 m/s (exact). [e]
- Squad tactical radio [r]: The designation, in U.S. and many other militaries, for a backpack radio assigned to squads of 9-13 soldiers, used for tactical coordination over a range of approximately 5 miles/8 kilometers; subsequent generations are more rugged, secure, and more power-efficient [e]
- TRC-170 [r]: A U.S. Army radio, with line-of-sight (LOS) and beyond-line-of-sight (BLOS), using troposcatter technology. It is transportable meaning that it can moved by tactical transport facilites but must be stopped and set up to work, and is part of the Joint Network Node system. [e]
- TRC-190 [r]: A High Capacity Line of Sight (HCLOS) microwave radio, used with the Joint Network Node of the U.S. Army to provide high-speed connectivity between nodes. [e]
- TSC-154 [r]: A U.S. military satellite earth station and individual user access facility, carried on a High Mobility Multipurpose Wheeled Vehicle (HMMWV), originally for interconnecting Mobile Subscriber Equipment (MSE) or providing extended range connection to MSE users, but now interconnecting Joint Network Nodes not in line-of-sight with one another. [e]
- Television [r]: Electronic transmission of moving pictures. [e]
- U.S. Navy [r]: The branch of the United States Armed Forces charged with sea operations [e]
- Visible light [r]: Electromagnetic radiation of a wavelength that is detectable by the human eye. [e]
- Wave-particle duality [r]: The concept that all matter and energy exhibits both wave-like and particle-like properties. [e]
- Wireless telegraphy [r]: The use of radio to send telegraphic messages rather than by long-distance transmission lines. [e]
- X-ray [r]: An ionizing type of electromagnetic radiation often used for structural investigations of matter. [e]

