Abstract
The magnetic disturbances produced on a worldwide scale by high-altitude nuclear detonations are treated. The characteristics of the magnetic signals from Argus 3 and Starfish are briefly discussed. Particularly, the fast propagation time observed for the early part of the signal is explained by the magnetohydrodynamic-electromagnetic coupling mechanism. An idealized model is explored of excitation of extremely low frequency electromagnetic waves in a cylindrical vacuum cavity by magnetohydrodynamic waves incident from the surrounding plasma. It is found that there is a characteristic time needed for the cavity waves to respond to this external excitation: no matter how fast the excitation, the cavity wave amplitude changes in a time of the order of 2 seconds.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
