Can we expect an active sun for the campaign in September 1999?

Sunspots from the last solar cycle, up to the present, and estimated 12 months into the future from the Sunspot Index Data Center (SIDC). This plot is updated at the first of every month at SIDC. Check at SIDC for information on how this compares to the last 4 solar cycles and to the historical records.

Why was the interval 15-17 Sept 1999 selected?

These plots were extracted from 27-day plots of solar wind parameters provided by the MIT Space Plasma Group. The Latest Wind SWE 27-day Plots are given here.