Diagnostic study of geomagnetic storm-induced ionospheric changes over very low-frequency signal propagation paths in the mid-latitude D region
Data sets
National Space and Aeronautics Administration, Goddard Space Flight Center https://sohoftp.nascom.nasa.gov//sdb/goes/ace/daily/
Data Analysis Center for Geomagnetism and Space Magnetism http://wdc.kugi.kyoto-u.ac.jp/dstdir/index.html