Earth's magnetic field (IMAGE) University of Texas at Austin Caption A computer simulation of the Earth's magnetic field, which is generated by heat transfer in the Earth's core. Credit NASA/ Gary A.Glatzmaier Usage Restrictions Include image credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.