Index of ftp://ftp.ngdc.noaa.gov/ionosonde/data/CB53N/daily
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![[LNK]](/icons/link.gif) 1987 | 34.00b | June 5 2014 |
| 1988 | 34.00b | June 5 2014 |
| 1989 | 34.00b | June 5 2014 |
| 1990 | 34.00b | June 5 2014 |
| 1991 | 34.00b | June 5 2014 |
| 1992 | 34.00b | June 5 2014 |
| 1993 | 34.00b | June 5 2014 |
| 1994 | 34.00b | June 5 2014 |
| 1995 | 34.00b | June 5 2014 |
| 1996 | 34.00b | June 5 2014 |
| 1997 | 34.00b | June 5 2014 |
| 1998 | 34.00b | June 5 2014 |
| 1999 | 34.00b | June 5 2014 |
| 2000 | 34.00b | June 5 2014 |
| 2001 | 34.00b | June 5 2014 |
| 2002 | 34.00b | June 5 2014 |
| 2003 | 34.00b | June 5 2014 |
| 2004 | 34.00b | June 5 2014 |
| 2005 | 34.00b | June 5 2014 |
| 2006 | 34.00b | June 5 2014 |
| 2007 | 34.00b | June 5 2014 |
| 2011 | 34.00b | June 5 2014 |
| 2012 | 34.00b | June 5 2014 |
| 2022 | 37.00b | February 3 2022 |