  This section shows an overview of a recent development of the studies on
great space weather events in history. Its discussion starts from the
Carrington event and compare its intensity with the extreme storms within the
coverage of the regular magnetic measurements. Extending its analyses back
beyond their onset, this section shows several case studies of extreme storms
with sunspot records in the telescopic observations and candidate auroral
records in historical records. Before the onset of telescopic observations,
this section shows the chronological coverages of the records of unaided-eye
sunspot and candidate aurorae and several case studies on their basis.
