solar activity

Other natural climate variations include solar activity and volcanoes.

The eclipse of 1883 was at a time of rapidly decreasing solar activity, yet the Corona had the features of a Sun-spot maximum.

As to causes, variations in solar activity are naturally receiving attention, and the results thus far are promising.

That figure, it will be recalled, shows what happens to precipitation when solar activity is increasing.

The degree of solar activity would have much to do with the final extent of the ice sheets.

In this connection, however, it must be remembered that solar activity may arise in various ways, as will appear more fully later.