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(meteorobs) Fwd: Noctilucent Meteor Trains?


------- Forwarded Message

Date: Fri, 24 Sep 1999 14:56:24 -0700 (PDT)
From: Robert Verish <bolidechaser@yahoo.com>
Subject: Noctilucent Meteor Trains?
To: meteorobs@jovian.com

Can't find it, but there was a recent thread regarding
last years Leonids.  The observer stated that he saw a
persistent train fade and then re-illuminate(?)

Instead of being caused by reflected light, could the
"reappearing train" have been the result of turning
noctilucent?

Below is a recent post on another discussion group
regarding "glowing clouds" after the 1908 Tunguska
event:


-----Original Message-----
From: Bernd Pauli HD
[mailto:bernd.pauli@lehrer1.rz.uni-karlsruhedot de] 
Sent: Friday, September 24, 1999 2:12 PM
To: bergrob
Cc: meteorite-list@meteoritecentral.com
Subject: Light in the sky - Tunguska


bergrob schrieb:

> Hello list!,

> My late grand-mother (born on 1-1-1900) told me
about about
> two nights, when she was a little girl, that it was
so light
> in Holland that you could read a news-paper. It was
in 1908,
> june. I just watched National geograpic tv: june 30
1908
> Tunchuska! I just realised that she was a witness of
it!!!!
> (It didn't harm her: she became 93)
> Greetings, Robert Bergkotte


Hello All !

Tunguska '96, Bologna, Italy, July 15-17, 1996 -
Meeting Report from
A. Harris:

" ... a great deal of material was deposited in the
upper atmosphere,
resulting in enhanced white nights lasting for some
weeks."

" ... the observed white nights would be expected,
regardless of
whether the bolide was cometary or asteroidal."

A. Chaikin (1984) Target: Tunguska (S&T, Jan 84,
18-21):

" ... An active comet might also explain the skyglows
witnessed
 over much of Europe on the night of the event and for
a few nights
afterward."

R.A. Gallant (1994) Journey to Tunguska (S&T, Jun 94,
38-43):

"Following the Tunguska explosion, unusually colorful
sunsets and
sunrises caught the attention of observers in western
Europe,
Scandinavia, Russia, and western Siberia. The climax
of visual displays
occurred on the night of June 30th, though they
continued over several
weeks, weakening exponentially. The NEW YORK TIMES of
July 3, 1908,
reported 'remarkable lights ... observed in the
northern heavens,' and
scientists mistakenly attributed the dazzling skies to
electrical
disturbances in the atmosphere caused by solar
outbursts ..."

"These optical fireworks and 'light nights' were most
prominent over
eastern Siberia and central Asia. They included a
night sky bright
enough to cast shadows and allow a newspaper to be
read."

"Ice-coated dust grains at heights of 40 to 70 km
created noctilucent
(night-shining) clouds that illuminated much of the
visible sky, and
there were halos around the sun."

"A marked decrease in the air's transparency was
recorded in the United
States by the Smithsonian Astrophysical Observatory
and Mount Wilson
Observatory."


Best regards,

Bernd

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