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What are the hazardous effects of magnetic storms?

Sub-ionospheric radio transmission.The infrastructure and activities of our modern technologically-based society can be adversely affected by rapid magnetic-field variations generated by electric currents in the near-Earth space environment, particularly in the ionosphere and magnetosphere. This is especially true during so-called "magnetic storms."

 

  • Because the ionosphere is heated and distorted during storms, long-range radio communication which relies on sub-ionospheric reflection can be difficult or impossible and global-positioning system (GPS) communications, which relies on radio transmission through the ionosphere, can be degraded.
  • Ionospheric expansion can enhance satellite drag and thereby make their orbits difficult to control.
  • During magnetic storms, satellite electronics can be damaged through the build up and subsequent discharge of static-electric charges, and astronaut and high-altitude pilots can be subjected to increased levels of radiation.
  • There can even be deleterious effects on the ground: pipe-line corrosion can be enhanced and electric-power grids can experience voltage surges that cause blackouts.

Earth surrounded by GPS satellites.

The reason why space-based effects can have consequences down here on the Earth's surface is related, at least in part, to our answer to another frequently asked question, "What is a magnetic field?." Electric currents in one place can induce electric currents in another place. This action at a distance is accomplished via a magnetic field. So, even though rapid magnetic-field variations are generated by currents in space, very real effects, such as unwanted electric currents induced in electric-power grids, can result down here on the Earth’s surface.



Learn more: about the hazardous effects associated with geomagnetic activity at the USGS National Geomagnetism Program Further Reading Web page. Electric power-line towers.

 

Tags: Geomagnetism, Magnetic Field, Monitoring, Sun, Core, Declination, Polarity