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[DX] Stratwarmin määritelmä
NRC-listalta poimittua (NOAA:n määritelmä):
"Stratwarm is an alert provided by SEC that is a code word designating a
major
disturbance of the winter, polar, middle atmosphere from the tropopause to
the
ionosphere, lasting for several days at a time and characterized by a
warming
of the stratospheric temperature by some 10's of degrees. There is no
evidence
that stratwarms are caused by solar events, or that they affect the lower
atmosphere
(in fact the disturbance may be generated by tropospheric conditions). A
stratwarm
can have affects on communications with HF radio frequencies causing HF
propagation."
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