Where can a find historical data on solar activity?
I suggest that you use sunspot data, because it is the record of solar activity that goes back the furthest. You can find it at the NASA/Marshall Solar Physics Site. Can I find similar data for geomagnetic and solar wind activity and coronal mass ejections? You can find solar wind data back through the 1960s or so at the NSSDC (National Space Science Data Center). It is referred to as OMNI data I believe. You can find CME data for the past 8 years or so at the SOHO LASCO CME Catalog. A good geomagnetic index is Dst. See the index at the World Data Center for Geomagnetism. Dr. Richard Mewaldt (October 2004) • Interplanetary Coronal Mass Ejections We have been looking at this ICME table and need some help reading it. Which column has the date that a CME reaches the Earth? The footnotes (a) and (b) describe the difference between these columns. The first column is basically the leading edge that was observed. Sometimes it is a shock (which has some stand-off distance from the ICME materia
