Why can magnets refer to north and south?It turns out that the earth is a huge natural magnet, and its magnetic field is the same as that of a bar magnet.The geomagnetic field is of great significance to human production and life.Marching and navigation use the effect of geomagnetic field on compass to orient.People can also search for mineral deposits according to the distribution characteristics of the geomagnetic field on the ground.The variation of the geomagnetic field can affect the propagation of radio waves.When the local magnetic field is strongly disturbed by sunspot activity, remote communication will be seriously affected or even interrupted.If there is no geomagnetic field, the strongCharged particle flow(usually called solar wind), will not be deflected by the effect of the geomagnetic field and will directly hit the earth.In this caseHigh-energy particleUnder the bombardment of, the atmosphere composition of the earth may not be what it is now, and life will not exist.So the geomagnetic field is a "protective umbrella" for us.
