Index of ftp://ftp.ngdc.noaa.gov/ionosonde/data/AD930/individual

[DIR] Parent Directory

[LNK] 2018  39.00b  November 1 2018
[LNK] 2019  39.00b  January 29 2019
[LNK] 2020  39.00b  December 31 2019
[LNK] 2021  39.00b  January 17 2021