Focus: GS III: Science and technology
Why in News?
Recently on the occasion of the 148th Foundation Day of India, the Meteorological Department (IMD) Union Minister of Earth science said the entire Country will be covered by Doppler Weather Radar Network by 2025.
- Radars emit a beam of energy, called radio waves, from an antenna.
- When these waves strike objects in the atmosphere, some of the energy is reflected back to the radar.
- A Doppler radar is a specialized type of radar that uses the Doppler effect to measure the velocity of objects at a distance.
- It can provide information about the movement and position of targets, and is commonly used to observe rainfall, cloud formations, thunderstorms, and lightning in real-time.
- It was first described (1842) by Austrian physicist Christian Doppler.
- It is the apparent difference between the frequencyat which sound or light waves leave a source and that at which they reach an observer, caused by the relative motion of the observer and the wave source.