Index of ftp://ftp.ngdc.noaa.gov/STP/space-weather/ionospheric-data/sids
Parent Directory
aavso
5.00b
October 26 2014
documentation
6.00b
August 10 2014
field-strength
16.00b
March 23 2014
reports
61.00b
September 7 2014
tables
14.00b
September 1 2014
ww2-ionodata
5.00b
March 23 2014