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1. Topband: Sudden Ionospheric Disturbances (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Wed, 05 Jan 2005 07:20:28 -0500; Sudden Ionospheric Disturbances, or SIDs. These have not been caused by solar flares or the like, but rather from GRBs ... Gamma Ray Bursts, from very distant objects, like several hundred light year; /archives//html/Topband/2005-01/msg00055.html (7,465 bytes)
2. Topband: Sudden Ionospheric Disturbances (score: 1): Author: N7DF <n7df@yahoo.com>; Date: Fri, 25 Feb 2011 15:03:55 -0800 (PST); The following website has some interesting information that may help us to figure out what goes on in topband propagation It seems to be reasonable to expect that VLF conditions relate to MF conditio; /archives//html/Topband/2011-02/msg00178.html (6,480 bytes)
3. Re: Topband: Sudden Ionospheric Disturbances (score: 1): Author: "ZR" <zr@jeremy.mv.com>; Date: Sat, 26 Feb 2011 10:34:42 -0500; Ive been running comparisons between European BCB down in the 200KHz region, some NDB's, Experimenters band at 500KHz, AM BCB, and 160M for many years. The 500KHz section only for a few years. While; /archives//html/Topband/2011-02/msg00181.html (7,690 bytes)
4. Re: Topband: Sudden Ionospheric Disturbances (score: 1): Author: Arthur Delibert <radio75a3@msn.com>; Date: Sat, 26 Feb 2011 14:33:36 -0500; I've also seen on the BCB that a very short distance can seem to make a considerable difference. Sometimes one station in France is relatively good here in Maryland, the others very poor. Or London o; /archives//html/Topband/2011-02/msg00183.html (9,504 bytes)

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