Sentences with phrase «monthly mean sunspot»

First we estimate the uncertainty of a monthly mean sunspot number reconstructed from a single daily observation.

Since then, solar activity has steadily declined (monthly mean sunspot number now around 40), but remained above 70 over many months, probably indicating that the annual mean for 2014 will also mark a yearly maximum at 78.9.

We now also separate in distinct files the monthly mean sunspot number from the 13 - month smoothed sunspot number, which is considered as a secondary data set.

Not exact matches

Yearly mean sunspot number (black) up to 1749 and monthly 13 - month smoothed sunspot number (blue) from 1749 up to the present.