Index of ftp://ftp.ngdc.noaa.gov/ionosonde/

[DIR] Root Directory

[DIR] catalog  3.00b  June 29 2017
[DIR] data  160.00b  October 31 2019
[DIR] documentation  28.00b  August 14 2018
[DIR] mids01  93.00b  July 11 2012
[DIR] mids02  127.00b  November 17 2013
[DIR] mids03  2.00b  September 24 2009
[DIR] mids04  114.00b  October 27 2012
[DIR] mids05  91.00b  January 3 2014
[DIR] mids06  96.00b  January 22 2016
[DIR] mids07  99.00b  January 10 2017
[DIR] mids08  101.00b  December 21 2017
[DIR] mids09  98.00b  December 27 2017
[DIR] mids10  108.00b  January 29 2019
[DIR] mids11  104.00b  November 6 2019
[DIR] mids12  99.00b  March 6 2020
[DIR] request  46.00b  July 9 2020 at 02:01
[DIR] software  26.00b  May 21 2018