Friends in Radi Land
The recent postings about long-period (2-3 minute) QSB were interesting in
that there seemed to be no magnetic/auroral activity at the time. This
suggested an origin associated with atmospneric motions affecting the
ionosphere. Such motions of the atmosphere and ionosphere are coupled via
the dominance of numbers of atmospheric constituents over ionospheric
electrons and the high collision rate of electrons and neutrals in the
atmospbere.
The question then comes down to the atmospheric motions. In that regard,
one possibility would be vertical oscillations of atmospheric gravity
waves (AGW). Around sunrise such motions could give rise to a shutter
mechanism by vertical transport of ozone, the vertical oscillations
of the atmosphere varying the horizontal tranmission or passage of
solar UV to the D-region.
My own investigations of 55 kHz LF signals published earlier in the Low
Band Monitor have shown about a half-hour delay of sunrise absorption of
low-band signals due to the presence of atmospheric ozone, It would seem
that vertical motions of the local ozone layer could give rise to the QSB
that modulated the strength of DX signals.
Just a thought,
Bob, NM7M
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