We've had over a week of intense fade-out and my people tell me that there's no observable flare activity on the sun at the moment.

The stars may undergo variation in the level of flare activity over periods lasting several years.

The first such flare activity was observed from Australia in 1951 when the star increased in magnitude by 0.4.

Because of the low rate of flare activity, it is thought to be a magnetically evolved star.

This appears to be a relatively quiescent star, and no flare activity has been detected.

That's a classic curve for flare activity, there on the graph.

There was a burp of increased flare activity only twenty minutes or so behind that first dip in radiation.

The aurora borealis is caused by solar flare activity, yet there was none reported in the previous day.

The U.S. forces observed heavy flare activity throughout the afternoon.

This contributed to developing methods of predicting and monitoring solar flare activity.