Download Electric and Magnetic Fields 3rd edition (1956) by Stephen S. Attwood PDF
By Stephen S. Attwood
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Additional info for Electric and Magnetic Fields 3rd edition (1956)
Example text
This phenomenon is called magnetotail, which extends hundreds of thousands of kilometers into space. The impact of the solar wind causes the lines facing sunward to compress, while the field lines facing away from the sun stream back [9]. The solar activity causes geomagnetically induced currents (GICs), which may flow into and out of the electric power grid through various ground points. The driving force is the voltage induced in the transmission lines, both by the ionospheric current and by the earth current.
The thermal mode of energy storage consists of translational movement modes, in which atoms move horizontally and vertically about their lattice points in a medium. This is commonly referred to as heat. The amount of energy that a material will absorb from radiation depends on the operating frequency, intensity of beam, and the duration of exposure. The most important of these parameters is the frequency. EM radiation can excite translational and vibrational modes and generate heat. The intensity of the beam is also a factor in determining how much energy is absorbed.
Panel antenna: A panel antenna (also called directional) is an antenna or array of antennas designed to concentrate the radiation in a particular area. A panel antenna is typically a flat, rectangular device used for cellular base stations in cities and suburban areas where greater customer capacity is needed. Phased array antenna: Several antennas can be arrayed in space to make a desired directional pattern. By controlling the phase shift between successive elements in an array antenna, the direction can be steered electronically without physically moving the antenna structure.