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re: (meteorobs) Zenith Attraction Quuestion
Wayne's splitting head said:
> From the IMO handbook, here are some #'s:(reprinted with hopeful
>permission of the IMO)
>
>Vel of Shwr 30 40 60 kps
>
>Rad elev 20 2.5d 1.6d 0.7d
> 30 2.1d 1.3d 0.6d
> 40 1.7d 1.0d 0.4d
> 60 1.0d 0.6d 0.3d
>
>As you can see, the radiant's elevation is also a factor since, a radiant
>at the zenith can't have it's meteors attracted closer to the zenith. So
>the effect is greater at lower elevations. For those of us up north here,
>with a shower like the alpha-Capricornids (Vel 25 kps) and a consistantly
>low elevation, it might be more than 3 degrees.
And so Steve's empty one inferred:
So, the path actually does not get bent all that much in any case, just a
"few" degrees? OK...I was thinking along the lines that if the path were
bent more like 45 degrees, then the ionization trail behind the meteoroid
could cause a drastic radio-wave-reflection polarization shift from
predominantly-horizontal to a-lot-of-vertical; but it would take something
more like 20+ degrees to cause a noticeable change of these characteristics.
The other thing is that 25 kps is pretty slow to start with and might not
provide much ionization at the radio frequencies I'm considering in the
first place, so the whole thought is probably moot (as one might expect from
a vacuumhead).
Thanks! Steve Harrison