Only during the occasional lull in magnetic activity could a voice or data signal punch through to the outside universe.

The index reflects, hour by hour, the magnetic activity of the sun.

The study found that adults 55-67 years of age showed less magnetic activity in their prefrontal cortices than the control group.

With an estimated age of 7.3 billion years, it is a stable star with no significant magnetic activity.

The magnetic activity on this star shows an unusually long period of variability, cycling about once every 23 years.

A sunspot is an area of high magnetic activity, on the surface of the Sun.

Such stars typically do not show a marked level of magnetic activity.

This is attributed to consequences of the stars' strong magnetic activity.

The other nine showed a range of magnetic activity similar to the Sun's 11-year cycle.

The overall magnetic activity of this star is irregular, but it may vary with a 4.9-year period.