Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 24 - Think and Explain: 66

Answer

Cosmic ray intensity at the Earth’s surface is greater.

Work Step by Step

Incoming cosmic rays move at an angle to the Earth’s magnetic field, and are deflected away. When the Earth’s magnetic field passes through a zero phase, this protection diminishes, and more cosmic rays reach the surface.
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