Radio Frequency Identification is a technology where data is transmitted via radio waves on the electromagnetic spectrum. An RFID system consists of a radio frequency transceiver which both transmits and receives signals, and a miniature transponder in the form of an RFID “tag” that houses an antenna for receiving signals and a tiny chip containing the RF circuitry and the information to be tra...

A novel method for the excitation of ELF waves in the ionosphere is presented. It utilizes the nonlinear mixing of two groundor satellite-produced radio frequency waves with a compressional Alfv6n wave. Parametric amplification thresholds are estimated to be between 10 and 20 MW peak power for 5-MHz pumps producing waves in the ELF range. Potential applications to ELF communications are discussed.

Context. The six known highly dispersed fast radio bursts are attributed to extragalactic radio sources, of unknown origin but extremely energetic. We propose here a new explanation – not requiring an extreme release of energy – involving a body (planet, asteroid, white dwarf) orbiting an extragalactic pulsar. Aims. We investigate a theory of radio waves associated to such pulsar-orbiting bodie...

Compared to steadily propagating waves (SPW), damped waves (DW), another solution to the nonlinear wave equation, are seldom studied. In cardiac tissue after electrical stimulation in an SPW wake, we observe DW with diminished amplitude and velocity that either gradually decrease as the DW dies, or exhibit a sharp amplitude increase after a delay to become an SPW. The cardiac DW-SPW transition ...

Radio astronomy is the study of celestial objects through analysis of radio waves. This field allows scientists to observe astronomical phenomena that are often undetectable in other portions of the electromagnetic spectrum. In its brief 70-year history, radio astronomy has revealed new types of celestial objects, including pulsars and quasars, and notably, cosmic microwave background radiation...

Motivated by recent observations of type II radio bursts, we study propagation of shock waves by the twodimensional numerical magnetohydrodynamic model. Explosion of a hot plasma is investigated for various ratios of the mass density and magnetic field intensity in a fan of coronal loops. Ducting of shock waves occurs along loop-like structure and ducting of possible radio emission in under-den...

The solar corona is a very dynamic plasma on time scales of decades to a few milliseconds. Radio missions provide diagnostic tools particularly suited for the analysis of non-thermal electron distributions, enhanced levels of various kinds of plasma waves and plasma phenomena related to electron acceleration in flares. Very intense coherent emissions are observed at frequencies below about 3GHz...