(meteorobs) Meteoroid Streams and the Moon

[prospector at znet.com]

I had looked at the article minutes before checking my email, considered
posting the page to meteorobs because of Chris, but I see someone beat me,
except the address was incomplete, the missed part is.../fulltext.html

I'll try to post the complete address, it was complete on a test to my gmail
account.

http://www.springerlink.com/content/j1558234017p1043/fulltext.html

                                    Dave English
                                Oceanside, California

Quoting "Gural, Peter S." <PETER.S.GURAL at saic.com>:

>
> All;
>
> Regarding the question put forth by Chris et.al. - does the Moon
> occasionally
> shield places on Earth from a stream? I actually published a paper
> recently on this prospect for the Meteoroids 2007 conference entitled
> "Lunar Gravitational Focusing of Meteoroid Streams and Sporadic Sources"
> in "Advances in Meteoroid and Meteor Science" pp183-189. For stream
> velocities of 34km/sec or less there is a focus point (and associated
> flux enhancement) at the Earth-Moon distance if the Moon is close to the
> radiant position. Higher than 34 km/sec and the flux enhancmeent point
> moves beyond the Earth-Moon range, and an eclipse occurs so to speak. The
> Geminids are 35 km/sec so are on the hairy edge. The region of focus is
> very, very narrow - just a few thousand km wide so the alignment must be
> nearly perfect for any flux enhancement to occur. The journal article
> concerned itself with GEO belt encounters but extrapolating to the Earth
> radius, the Moon's alignment with the radiant position would need to be
> within one degree to see any effect. This would appear as Gemini
>  d meteors moving along non-Geminid radiant directions and a reduction in
> flux from normal rates. I would have to work out the diameter of the
> eclipse region. Just how close is the radiant to the Moon in this year's
> encounter ? If more than a degree then the focusing/eclipse effect will
> be mostly non-existant.
>
> Cheers... Pete Gural
>
>
>
>
> _______________________________________________
> Mailing list meteorobs: meteorobs at meteorobs.org
> To UNSUBSCRIBE, email: owner-meteorobs at meteorobs.org
> http://lists.meteorobs.org/mailman/listinfo/meteorobs
>
>