The ionosphere is the ionized part of the upper atmosphere of Earth, from about 48 km (30 mi) to 965 km (600 mi) above sea level, a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar radiation. It plays an important role in atmospheric electricity and forms the inner edge of the magnetosphere. It has practical importance because, among other functions, it influences radio propagation to distant places on Earth. It also affects GPS signals that travel through this layer.
The Heaviside layer, sometimes called the Kennelly–Heaviside layer, named after Arthur E. Kennelly and Oliver Heaviside, is a layer of ionised gas occurring roughly between 90km and 150 km above the ground — one of several layers in the Earth's ionosphere. It is also known as the E region. It reflects medium-frequency radio waves. Because of this reflective layer, radio waves radiated into the sky can return to Earth beyond the horizon. This "skywave" or "skip" propagation technique has been used since the 1920s for radio communication at long distances, up to transcontinental distances.
Microwave is a form of electromagnetic radiation with wavelengths shorter than other radio waves but longer than infrared waves. Its wavelength ranges from about one meter to one millimeter, corresponding to frequencies between 300 MHz and 300 GHz, broadly construed. A more common definition in radio-frequency engineering is the range between 1 and 100 GHz, or between 1 and 3000 GHz . The prefix micro- in microwave is not meant to suggest a wavelength in the micrometer range; rather, it indicates that microwaves are small, compared to the radio waves used in prior radio technology.
Sir Robert Alexander Watson-Watt was a Scottish radio engineer and pioneer of radio direction finding and radar technology.
Shortwave radio is radio transmission using radio frequencies in the shortwave bands (SW). There is no official definition of the band range, but it always includes all of the high frequency band (HF), which extends from 3 to 30 MHz ; above the medium frequency band (MF), to the bottom of the VHF band.
Radio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies. The first detection of radio waves from an astronomical object was in 1933, when Karl Jansky at Bell Telephone Laboratories reported radiation coming from the Milky Way. Subsequent observations have identified a number of different sources of radio emission. These include stars and galaxies, as well as entirely new classes of objects, such as radio galaxies, quasars, pulsars, and masers. The discovery of the cosmic microwave background radiation, regarded as evidence for the Big Bang theory, was made through radio astronomy.
Alouette 1 is a deactivated Canadian satellite that studied the ionosphere. Launched in 1962, it was Canada's first satellite, and the first satellite constructed by a country other than the Soviet Union or the United States. Canada was the fourth country to operate a satellite, as the British Ariel 1, constructed in the United States by NASA, preceded Alouette 1 by five months. The name "Alouette" came from the French for "skylark" and the French-Canadian folk song of the same name.
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another in vacuum, or into various parts of the atmosphere. As a form of electromagnetic radiation, like light waves, radio waves are affected by the phenomena of reflection, refraction, diffraction, absorption, polarization, and scattering. Understanding the effects of varying conditions on radio propagation has many practical applications, from choosing frequencies for amateur radio communications, international shortwave broadcasters, to designing reliable mobile telephone systems, to radio navigation, to operation of radar systems.
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere. Since it is not limited by the curvature of the Earth, skywave propagation can be used to communicate beyond the horizon, at intercontinental distances. It is mostly used in the shortwave frequency bands.
Ronald Newbold Bracewell AO was the Lewis M. Terman Professor of Electrical Engineering of the Space, Telecommunications, and Radioscience Laboratory at Stanford University.
Sir Edward Victor Appleton was an English physicist, Nobel Prize winner (1947) and pioneer in radiophysics. He was awarded the Nobel Prize in Physics "for his investigations of the physics of the upper atmosphere especially for the discovery of the so-called Appleton layer". He studied, and was also employed as a lab technician, at Bradford College from 1909 to 1911.
The Institution of Engineering and Technology (IET) is a multidisciplinary professional engineering institution. The IET was formed in 2006 from two separate institutions: the Institution of Electrical Engineers (IEE), dating back to 1871, and the Institution of Incorporated Engineers (IIE) dating back to 1884. Its worldwide membership is currently in excess of 158,000 in 153 countries. The IET's main offices are in Savoy Place in London, England, and at Michael Faraday House in Stevenage, England.
This article details the history of electrical engineering.
Umran Savaş İnan is a Turkish scientist at Koç University and Stanford University in the field of geophysics and very low frequency radio science. İnan was the president of Koç University between 2009 and 2021.
The Faraday Medal is a top international medal awarded by the UK Institution of Engineering and Technology (IET). It is part of the IET Achievement Medals collection of awards. The medal is named after the British physicist Michael Faraday, the father of electromagnetism.
Fast, Affordable, Science and Technology Satellite-Huntsville 01 or FASTSAT-Huntsville 01 of the NASA. FASTSAT-HSV 01 was flying on the STP-S26 mission - a joint activity between NASA and the U.S. Department of Defense Space Test Program, or DoD STP. FASTSAT and all of its six experiments flying on the STP-S26 multi-spacecraft/payload mission have been approved by the Department of Defense Space and Experiments Review Board (USA-220).
RAX-2 is a CubeSat satellite built as a collaboration between SRI International and students at the University of Michigan College of Engineering. It is the second spacecraft in the RAX mission. The RAX-1 mission ended after approximately two months of operation due to a gradual degradation of the solar panels that ultimately resulted in a loss of power. RAX team members applied the lessons learned from RAX-1 to the design of a second flight unit, RAX-2, which performs the same mission concept of RAX-1 with improved bus performance and additional operational modes. Science measurements are enhanced through interactive experiments with high power ionospheric heaters where FAI will be generated on demand.
The Institution of Engineering and Technology (IET) awards achievement medals to recognize engineers who have been significant contribution to various fields in engineering Every year, the award committee seeks and evaluates nominations and makes decision on winners. There is no age limit or nationality requirement. It is an international award.
Elizabeth Laverick was a British engineer who became technical director of Elliott Automation Radar Systems. Laverick was the first female deputy secretary of the Institution of Electrical Engineers and president of the Women's Engineering Society. She was the first woman to receive a PhD in a scientific curriculum at Durham University, and was appointed an OBE in 1993.
Llewelyn Robert Owen Storey is a British physicist and electrical engineer who has worked and lived most of his adult life in France. He is known for his research on the Earth's atmosphere, especially whistlers—very low frequency (VLF) radio waves caused by lightning strikes—and the plasmasphere. He was the first person to prove whistlers are caused by lightning strikes and to deduce the plasmasphere's existence. He was heavily involved in designing scientific instruments for FR-1, a 1965 French-American satellite, and subsequent studies and experiments using data FR-1 collected.
