Logging in (or registering) will help the system to select questions that you need to focus on.

G3A13

What does the A-index measure?

Select	Answer
A	The long-term stability of Earth’s geomagnetic field
B	The relative position of sunspots on the surface of the Sun
C	The solar radio flux at Boulder, Colorado
D	The amount of polarization of the Sun’s electric field

---

Hamboozler: Copyright 2007 Four Batons Technology. All rights reserved.
By continuing to use this site, you are agreeing to the Privacy Policy and Terms of Service.
Contact Us