On Jan 14, 2:37*pm, Cecil Moore wrote:
It is impossible for EM energy to "slosh".
[gratuitous insult snipped]
EM (photonic) waves do NOT change direction unless a change in medium
is encountered. "Sloshing" requires a change in direction in the
complete absence of a medium change.
[gratuitous insult snipped]
There is no net energy movement in the kx direction as evidenced by
the equation: cos(kx)*cos(wt). All the energy movement is between the
E-field and H-field at any fixed point along the wire.

As you say, the energy moves between the E-field and the H-field,
but the locations of maximum energy along the line for each of these
fields is different, so the energy changes position on the line with
each cycle. The energy at any point on the line is not constant.

E-field energy will peak at the voltage maximums.
H-field energy will peak at the current maximums.
These are at different places (90 degrees apart).
So energy does move within the line, though no energy crosses a point
where the voltage or current is always 0.

http://www.eznec.com/misc/rraa/TLVis1.exe Demo #2 is a simulation that
helps visualize this change in the location of the energy.

...Keith