"ralph sansbury" wrote in message
...
Craig,
Glad to see you finally realize the value of Maxwell's
magnetic explanation of radiation pressure in addition to the
conservation of momentum explanation re the Compton effect and
other measurments of radiation pressure.
The whole reason for defining the photon was that Maxwell's
equations could not explain the photoelectric effect. That is,
Maxwell's spread out wave could not explain the nanosecond
quickness of the UV radiation source imparting enough energy to
eject electrons from a photoemissive surface.
So Einstein and others said the energy of the radiation,
instead of being spread out in a massless wave must be
concentrated in a massless particle moving like the massless wave
front at the speed of light.
So it may not be possible to conflate the two concepts to say
the oscillating electric field like the oscillating charge in its
source is compressed inside the photon and so can induce
oscillating charge in the receiver and at the same time
magnetically push on and be pushed by the receiver; and that
the photon emitted by the receiver as a result of this induced
oscillation would also push on and be pushed by the receiver.
I also recall the comment in some text that the photon concept
was applicable for UV and above but not for visible light and
lower frequencies.

No,
that's the other part of the reason for invoking photons to explain the
photoelectric effect. A photon of red energy does not have enough energy to
eject an electron, whereas a UV photon does. The photon concept is still
applicable.


DaveL

Thus it is not obvious to me at the moment which formula to use
to assess the magnetic effect of the 10^26Wsun and the 20kW
earth transmitter on induced oscillations in the spacecraft or on
the 8W oscillations of the spacecraft transmitter.
And it is not obvious to me yet the error in the detected
frequency of the Doppler shift from Pioneer 10. I feel you and
George overstate it and that it may be very small but not as
small you as claim. Would it be small enough to detect
specifically small pressure effects?
Ralph


"Craig Markwardt" wrote in
message news

"ralph sansbury" writes:
[ Markwardt: ]
Free atoms
are pushed around by laser light. These systems are all
small
compared to the distance to the radiator.

But the magnetic fields of the laser source are strong
enough
at these distances to produce the observed radiation
pressure.

I note your continued use of arbitrary terms like "strong
enough."

Again, your requirements of "weak" and "strong," and
"nearby" and
"distant," are completely arbitrary, to the extent that you
could
arbitrarily reject any evidence not to your liking.

As you can clearly see from my correction to the above
there is nothing arbitrary here. The point is that the
source and
the receiver must be in the case of weak sources near the
receiver
and in the case of the sun etc the receiver can be more
distant.

Without a definition of those terms, your distinction is
completely
arbitrary. Maxwell's equations do not distinguish between an 8
W
transmitter (Pioneer 10), or a 2 x 10^{26} Watt transmitter
(the Sun).

CM