Lyceum Society November 2019
Monday, November 4, 2019
The New York Academy of Sciences, 7 World Trade Center, 250 Greenwich St Fl 40, New York
Established in 1993, The Lyceum Society is comprised of the Academy’s retired and semi-retired Members. These Members are from diverse backgrounds, have different areas of scientific interest and expertise, and have practiced many professions. Their disciplines include Biological and Biomedical Sciences, Chemical and Physical Sciences, Mathematics and Information Sciences, Social Sciences, Engineering, Medicine, Dentistry, and many others.
The Society hosts convivial monthly meetings at the Academy. These meetings feature lectures and discussions with scientists from around the world, and also provide participating Members with the opportunity to give self-directed presentations and seminars based on their own specialties or new research interests. All Academy Members are welcome.
All Lyceum meetings (except December) are Brown Bag lunches.
For more information about the Lyceum Society, click here.
November 04, 2019
Brown Bag Lunch
The Earth's Magnetism
Earth’s magnetism was understood with a dipole model by 1600. Magnetic declination became an object of worldwide observation due to its importance in navigation, which continues today. Electromagnetic field theory began by 1821, and the Earth’s field was eventually understood in terms of a dynamo. The dynamo and declination ultimately supported the plate tectonics revolution in geology. The Earth’s magnetic poles migrate and reverse unpredictably. The magnetosphere normally shelters Earth from space weather, but there is a serious hazard to infrastructure from solar coronal mass ejections.