Does radar affect magnetism? Let's say I have two magnets, one is suspending the other. Would radar affect the magnetic field?


2 Answers 2


Under some circumstances it is possible that radar effect a permanent magnet in a sufficient way. First of course by heating. All radiation that hits the magnet and is not deflected by 100% heats the magnet. Second by the use of modulated radiation.

Radar is a modulated radio wave with zillion of photons having the same direction of their electric and magnetic fields. These fields could periodically attract and repeal the electrons and the nucleus of the magnet. Does this lead to a demagnetization depends from the magnets material, shape, orientation in relation to the radar, power of the radar, his frequency of modulation and, and, and.

Edit after Unnikrishnan comment. There are continuous working and modulated radars. In both cases in a magnetron electrons are accelerated and by this the emit photons in microwave frequency. Some radars work in continuous mode and others with modulated radiation, for example with 5,000 MHz.

The AZUSA tracking radar was used to monitor initial phases of launch for the Saturn S-II by telemetry with transponder frequency of 5,060 MHz (receiver) and 5,000 MHz (transmitter) with 2.5 W of power. (Source: Wikipedia)

  • 1
    $\begingroup$ "zillion of photons having the same direction of their electric and magnetic fields"- I have a slight confusion here. What do you actually mean by this sentence? $\endgroup$
    – UKH
    Oct 13, 2016 at 10:12
  • $\begingroup$ @Unnikrishnan please see my edit. $\endgroup$ Oct 13, 2016 at 14:44
  • $\begingroup$ 2.5 W is remarkably low (but Saturn V was a big target). Cobra Dane peaks at 16,000,000 Watts (16 MW peak, 1 MW average). $\endgroup$
    – JEB
    Jan 28, 2018 at 20:49

Does radar affect magnetism?

If the electromagnetic radiation emitted by a radar is extremely powerful in the vicinity of a magnet it can heat reaching a temperature where it loses its magnetization.


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