(meteorobs) "Helmet" of fireballs

[prospector at znet.com]

Karl,

   In the ten years of meteor watching, I have seen two clear shock waves
associated with meteors. One was moving sideways and preceeded the meteor
along the horizon a degree or two above the ocean, then the meteor
appeared, it was moving almost directly away from me, only at a twenty five
degree angle or so. While some may argue this was a meteor, with some merit,
my second was a beautiful -3 to -4 meteor coming up from the south for about
30 degrees. At first I wasn't sure if it was a stellite or meteor but I had
my binoculars on it, the shock wave became visual as an oval then expanded
out to about three times it's first size, then receeded in size until it
vanished visually. I did not hear electophonic sounds or later anything
that may have been sonic sounds. It was one heck of a show.

   There are also dark meteors, but that's another subject.

                                       Dave English
                                   Oceanside, California



Quoting Karl Antier <ka.antier at wanadoo.fr>:

> Dear meteor observers,
>
> A witness of a fireball described what he saw like a usual meteor, but
> with a "helmet" in front of it. Does anyone know what can be the cause
> of such a "helmet"? Is it due to the front schock? How?
> Thank you in advance for your answers!
>
> Clear skies!
> Karl
>
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