1. But a feature of each solar cycle is that the magnetic poles reverse.

2. The statistical distribution of magnetic shear angle in the ascending phase of solar cycle

3. 16 In summary, our results provide circumstantial support for the hypothesized link between solar cycle length and irradiance.

4. The amount of airglow and zodiacal light is quite variable (depending, amongst other things on sunspot activity and the Solar cycle) but given optimal conditions the darkest possible sky has a brightness of about 22 magnitude/square arcsecond.

5. Illustrations or reconstructions of the analog records of significant and interesting solar radio Bursts observed during Solar Cycle 20 at the AFGL Sagamore Hill Radio Observatory in Hamilton, Massachusetts, and the Manila Observatory in the Philippines are presented.