By Richard LeComte
LEXINGTON, Ky – The Earth’s mantle has spontaneous magnetism, contrary to what was believed until recently, and one University of Kentucky College of Arts & Sciences professor wants geophysicists to go figure out why.
Dhananjay Ravat, professor of geophysics, co-wrote a paper recently in Nature Reviews/Earth and Environment that explores reasons for the magnetism in the Earth’s mantle. Basically, the prevailing wisdom was that mantle could not be magnetic.
So what gives? The problem dates back to the launching of satellites in the late 1960s and ‘70s with magnetometers attached. Those devices picked up some strong magnetic anomalies that puzzled scientists.
“When satellites with magnetometers came along in the 1970s – the analysis techniques were crude compared to today’s standards – and