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The problem was actually below. There are
never-ending active convection currents flowing in
the troposphere. When those currents hit the bottom
of the stratosphere (the tropopause), the vibration
thereby caused is transmitted upward through the
stratosphere in the form of waves. Because the
vibrations at the tropopause are basically standing
vibrations, waves head both east and west at the same
time. However, if there is a current present, the
waves heading in the same direction as the current
are selectively absorbed by the current. On the other
hand,
waves that head against the
current penetrate it
and are transmitted to a greater distance. These
waves cause the current to reverse at a point far
from their point of origin.
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