Tag Archives: Earth’s Magnetic Field

VIDEO OF EARTH’S EVER-CHANGING MAGNETIC FIELD

The animation below shows changes in Earth’s magnetic field from January 2014 to June 2014 as measured by ESA’s SWARM trio of satellites.

VIDEO LINK: http://www.esa.int/spaceinvideos/content/view/embedjw/435200

The magnetic field protects us from cosmic radiation and charged particles that bombard Earth, but it is in a permanent state of flux.

Magnetic north wanders, and every few hundred thousand years the polarity flips so that a compass would point south instead of north. Moreover, the strength of the magnetic field constantly changes – and it is currently showing signs of significant weakening.

The field is particularly weak over the South Atlantic Ocean – known as the South Atlantic Anomaly. This weak field has indirectly caused many temporary satellite ‘hiccups’ (called Single Event Upsets) as the satellites are exposed to strong radiation over this area.

CREDIT:  ESA – ORIGINAL  ARTICLE LINK