WWV Data Formats

This shows how the format/data displayed in the WWV propcasts changed
over the years (prior to mid 1971 they were tone Morse coded).
The sample dates are not neccessarily the date on which a change was
initiated.  (Times UTC, SFX - solar flux, Abo - Boulder A-Index)

Oct       GEO 05 11 17 23
--------  --- -- -- -- --
10-01-64   W  U5 U7 N7 N6
10-02-64   E  N5 U7 N7 N6

Jan       GEO 05 12 17 23
--------  --- -- -- -- --
01-01-68  DEU U3 U5 N5 N4
01-02-68  DEE N6 U5 N4 N4

Nov       SFX Abo 01 07 13 19
--------  --- --- -- -- -- --
11-01-71  111   5 N6 N6 N6 N7
11-02-71  114   1 N6 N6 N6 N7

Dec       SFX Abo 01 07 14 19 06 12 18 24
--------  --- --- -- -- -- -- -- -- -- --
12-01-74   82   3 N6 N6 U5 U5  1  1  2  2
12-02-74   81  18 N6 U5 U6 N6  4  2  3  2

Those who were around will note the 1968 New Year's Day magnetic storm, which likely provided one of the few (if not only) instance of US transcontinental 50-MHz F₂ of Cycle 20.

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