  A revision is presented of the sunspot observations made by Charles Malapert
from 1618 to 1626, studying several documentary sources that include those
observations. The revised accounting of the group numbers recorded by Malapert
for that period shows new information unavailable in the current sunspot group
database. The average solar activity level calculated from these revised
records of Malapert is by almost one third greater than that calculated from
his records included in the current group database. Comparison of the sunspot
observations made by Malapert and by other astronomers of that time with regard
to the number of recorded groups and sunspot positions on the solar disk shows
good agreement. Malapert reported that he only recorded one sunspot group in
each sunspot drawing presented in Austriaca Sidera Heliocyclia (the documentary
source which includes most of the sunspot records made by Malapert), although
he sometimes observed several groups. Therefore, the sunspot counts obtained in
this present work on Malapert's sunspot observations represents the lower limit
of the solar activity level corresponding to those records.
