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(meteorobs) Re: meteorobs-digest V1 #516
owner-meteorobs-digest@latrade.com wrote:
>
> meteorobs-digest Monday, 8 September 1997 Volume 01 : Number 516
>
> ----------------------------------------------------------------------
> GOLLY! Lew,
Emersom purdy meteororbs 0n #515 and #516. How should I go about
"classifing" 'em?
A lurker, David
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> Date: Tue, 13 May 97 12:55:56 EST
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> ------------------------------
>
> From: Malcolm Currie <mjc@ast.star.rl.acdot uk>
> Date: Sat, 6 Sep 1997 23:28:09 +0100 (BST)
> Subject: Re: (meteorobs) Going by logic...
>
> On Sat, 6 Sep 1997, Cathy L. Hall wrote:
>
> > As for pre-midnight being known for its fireballs, I don't know on that
> > one... perhaps the more experienced people could tell us...
>
> Various surveys including a national all-sky camera network in the UK
> showed that fireballs were more frequent during the evening than the
> morning.
>
> Malcolm
>
> ------------------------------
>
> From: richardson@digitalexp.com (Jim Richardson)
> Date: Sat, 06 Sep 1997 17:57:40 -0500
> Subject: Re: (meteorobs) Fireball mags...
>
> I realize that I have been eating up more bandwidth than usual this week,
> but I thought I might post an answer to the several meteor
> light/magnitude/train questions that have been cropping up. Most of this
> comes out of the FAQ's posted on the AMS web site, which include reference
> lists. Part of my motivation for answering is so that if you have a better
> answer (and a reference), please let me know.
>
> >From the AMS Meteors FAQ:
>
> 4. Where does a meteor's light and color come from? What is a meteor train?
>
> The majority of light from a meteor radiates from a compact cloud of
> gaseous atoms and molecules immediately surrounding the meteoroid or
> closely trailing it. This cloud consists of a mixture of atoms and
> molecules ablated from the meteoroid itself as well as from the surrounding
> air. These excited particles will emit light at wavelengths characteristic
> for each element/compound. The most common emission lines from meteors
> originate from iron (Fe), oxygen (O), magnesium (Mg), sodium (Na), nitrogen
> (N), and calcium (Ca). Less frequently seen are the emission lines of
> hydrogen (H), Silicon (Si), Manganese (Mn), and Chromium (Cr).
>
> While most meteors produce a wide blend of these emissions, giving the
> meteor an overall white color, specifically colored meteors are often
> reported by meteor observers. Usually, such colors are rather weak in
> appearance; however, vivid colors are occasionally reported, especially
> with fireballs. Reported colors range across the spectrum, from reds,
> yellows, greens, and blues, to gold, orange, and (infrequently violet. The
> velocity of the meteor also plays an important role, since a higher level
> of kinetic energy will excite the atoms/molecules to a higher degree. Slow
> meteors are often reported as red or orange, while fast meteors frequently
> have a blue color. Due to the nearly identical composition and velocity of
> meteors belonging to a particular shower, several showers are known for
> their characteristically colored meteors.
>
> Often, a brief glow will remain after the passage of the meteor. If this
> glow persists for less than 0.5 seconds, it is called a wake. This residual
> glow is caused by the same atoms which produced the original light from the
> meteor, only at lower excitation energies.
>
> If the glow from the meteor trail persists for a longer period, this is
> called a meteor train. Trains are most often seen from fast, bright
> meteors, in the altitude band from about 100 to 120 km (62 - 75 miles).
> This type of train usually lasts about 1-2 seconds, and is primarily
> generated by the green emissions of the neutral nitrogen atom. On very rare
> occasions, a train may persist for several minutes, and will be observed to
> change shape as the trail is blown by upper atmosphere winds. Such
> persistent meteor trains provided scientists with their first data on winds
> in this region.
>
> Personal notes:
>
> Most of the light-emitting cloud is made up of atmospheric gases (something
> like 95 %), while the remainder is ablated material.
>
> As the atoms are ionized and excited, they also generate a cloud of free
> electrons which remain in the wake of the meteor as a long, thin,
> cylindrical-paraboloid trail. It is this trail of free electrons which is
> capable of reflecting radio waves. Immediately upon trail formation, the
> negative electrons repel each other, causing the trail radius to increase
> over time. This diffusion process causes most trails to rapidly dissipate,
> keeping radio reflections relatively short in duration.
>
> Note also that the long duration trails (those lasting several minutes) are
> still not very well understood. Some aurora-like mechanism is still needed
> in order to maintain the excitation of the oxygen and other atoms for this
> extended period of time.
>
> Steve's question also reminded me of smoke trails.
>
> >From the AMS Fireball FAQ:
>
> The second type of trail is called a smoke trail, and is more often seen in
> daylight fireballs than at night. Generally occurring below 80 km of
> altitude, smoke trails are a non-luminous trail of particulate stripped
> away during the ablation process. These appear similar to contrails left
> behind by aircraft, and can have either a light or dark appearance.
>
> Personal Notes:
>
> The question of how to relate meteor magnitudes to meteoroid size and mass
> is a very sticky one, and it seems that every paper or textbook has its own
> approach to this fundamental problem. Estimates for the 0 magnitude meteor
> range from 0.1 grams to 10 grams depending upon your source, with most
> accepting 1 gram as about ball park.
>
> Fireball experts use several measures to derive the initial mass of the
> meteoroid, such as trajectory, light curve, spectrum, initial velocity, and
> deceleration characteristics. Non-meteorite dropping fireballs probably
> range from about 100 g in mass up to a few kg, with densities ranging from
> 0.3 g/ml for the lightest cometary meteoroids to 3.7 g/ml for the typical
> stony asteroidal meteoroids. Thus, a 100 g meteoroid could have a
> spherical diameter ranging from 3.7 cm up to 8.6 cm, encompasing a range of
> ablation characteristics.
>
> Take care, everyone,
>
> Jim
>
> James Richardson
> Graceville, Florida
> richardson@digitalexp.com
>
> Operations Manager / Radiometeor Project Coordinator
> American Meteor Society (AMS)
> http://www.serve.com/meteors/
>
> ------------------------------
>
> From: Lewis Gramer <dedalus>
> Date: Sun, 7 Sep 1997 04:00:04 -0400
> Subject: (meteorobs) Weekly IRC Meteor Chat on Monday!
>
> As usual, there will be an Internet Relay Chat (IRC) session
> about meteor observing on Monday evening, starting at 8pm EDT,
> (which is 00:00 UT on Tuesday morning). Anyone with an interest
> in meteors, around the world, is welcome to attend this session
> (or our chat on Saturdays, 11am EDT, 15:00 UT).
>
> To attend, download a copy of one of the many IRC "client
> programs" (a good one for Windows is called "mIRC", and one for
> the Mac is "IRCle": both are available as try-to-buy shareware
> on the Internet). Once you have an IRC client on your computer,
> connect to the server on "DALnet" known as: centurion.daldot net
>
> After connecting to centurion.daldot net, you'll need to enter the
> IRC command for joining a chat session: /join #namn
> The "#namn" is the name of our meteor chat session. Good luck,
> and we look forward to "seeing" you on the "#namn channel"!
>
> Lew Gramer
> owner-meteorobs@latrade.com
> Co-Channel Operator of #namn
> Internet Coordinator, N.A.M.N.
>
> ------------------------------
>
> From: Rainer Arlt <arlt@compuserve.com>
> Date: Sun, 7 Sep 1997 05:04:30 -0400
> Subject: (meteorobs) Any Meteor Observers in Italy?
>
> >My daughter just went to Pisa as an exchange =
>
> >student. She asks if there are any astro clubs
> >or meteor observers in Italy.
>
> There is the UAI, don't know the Italian wording, but it means Italian
> Society of Astronomy. The Meteor Section is lead by Enrico Stomeo,
> stom@univedot it, from Venice. I don't know any meteor observer near Pisa.
>
> Rainer
>
> - -----------------------------------------
> Rainer Arlt -- Visual Commission Director
> International Meteor Organization
> visual@imodot net
> Home page of IMO: http://www.imodot net
> - -----------------------------------------
>
> ------------------------------
>
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> Date: Sun, 7 Sep 1997 05:50:42 -0400 (EDT)
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>
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> ------------------------------
>
> From: GeoZay@aol.com
> Date: Sun, 7 Sep 1997 08:54:07 -0400 (EDT)
> Subject: (meteorobs) Fireball Rates
>
> It is said in the Meteor Observers Handbook about Fireball rates that they
> have preferred periods where most are seen....Namely around the Vernal
> Equinox and in the early evening for the Northern Hemisphere. I was
> wondering if this is in reference to sporadics only...or is this a broad
> statement that includes the various major meteor showers such as the
> Perseids, Quadrantids, Leonids and the Geminids that don't occur near the
> Vernal Equinox? Or does this refer to only the meteorite dropping fireballs
> that are sporadics and asteroidal? It mentions that Rendtel and Knofel proved
> that the rates for visual and photographic fireballs are about three times
> the rates seen around the autumnal equionox....again, is this in reference to
> the slow moving asteroidal sporadic fireballs, or does this include the
> faster shower related cometary fireballs?
> George Zay
>
> ------------------------------
>
> From: Lew Gramer <lewkaren@tiacdot net>
> Date: Sun, 07 Sep 1997 10:24:05 -0400
> Subject: Re: (meteorobs) ADULT SITE ACTION...free time..no sign-up.,.,,,.,
>
> Eccch.
>
> This particular spammer is now being traced by postmasters at all of the
> intermediate domains used (or impersonated) in the offending mail header.
> With any luck, this unscrupulous advertiser will be off the internet soon.
>
> Apologies for the recent spate o' spam. I remain completely willing to
> consider proposals (emailed to ******ME PRIVATELY******) to screen all
> non-subscribers from posting to meteorobs. Again, the issue is that some
> non-subscribers may have genuine events (such as a -15 fireball) to report:
> manually screening such outside posts might mean they wouldn't reach the
> list in a timely way.
>
> Clear skies,
> Lew
>
> ------------------------------
>
> From: Lew Gramer <lewkaren@tiacdot net>
> Date: Sun, 07 Sep 1997 10:29:44 -0400
> Subject: Re: (meteorobs) Fireball mags...
>
> At 11:41 AM 9/6/97 -0700, Wes Stone wrote:
> >Speaking of lightning flashes, maybe these could be used to train oneself
> >for making fireball estimates. There was a serious thunderstorm 25 miles
> >away from the Oregon Star Party, with periodic blinding flashes intruding
> >into an otherwise 7th-magnitude sky. If I had wished to subject myself to
> >these and faced the "radiant" rather than turning away, maybe I could have
> >gotten some practice in for estimating the "big one".
>
> I really liked this idea, Wes! Sort of like turning lemons into lemonade:
> take an otherwise frustrating deep-sky evening, and turn it around into
> meteor deep training. :) Only problem is, how would you check your
> magnitude estimates for accuracy as the lightning flashes occured?
>
> Lew, on London time for a few weeks...
>
> ------------------------------
>
> From: Lew Gramer <lewkaren@tiacdot net>
> Date: Sun, 07 Sep 1997 10:33:25 -0400
> Subject: Re: (meteorobs) Going by logic...
>
> At 11:28 PM 9/6/97 +0100, you wrote:
> >Various surveys including a national all-sky camera network in the UK
> >showed that fireballs were more frequent during the evening than the
> >morning.
> >Malcolm
>
> Any proposed reason for this, Malcolm? Are slower heavy-object burnups
> actually likely to be BRIGHTER than fast ones for some reason? Or is there
> a preferred orbital plane and direction for heavier interplanetary debris,
> causing them to be more plentiful on the earth-catching than the
> earth-caught side?? Curious...
>
> Lew
>
> ------------------------------
>
> From: Henry Freedenberg <henryf@gly.fsudot edu>
> Date: Sun, 07 Sep 1997 14:01:14 -0400
> Subject: Re: (meteorobs) Re: Radio Meteors - will this work?
>
> Michael Boschat wrote:
> >
> > Hello Again;
> >
> > I have just ordered an $900 handheld radio form a radio place here
> > who sell amateur radios and they said it will detect meteors.
> >
> > It's an ICOM handheld ( scanner? ) can go from 150KHz to 2 Gigs continous.
> > It has SSB and CW capability.
> >
> > Anyone know of this make and if it will be useful for meteor detection?
> > It is digital readout.
>
> Mike, you ever get an answer to this?
>
> I have loads of Icom gear. Maybe you have been listening to meteors
> with the receivers you had but that you did not recognize it?
>
> You ever meet with Fr. Lonc? What did he recommend?
>
> Henry
>
> ------------------------------
>
> From: Mark Davis <MeteorObs@Charlestondot net>
> Date: Sun, 07 Sep 1997 18:26:44 -0400
> Subject: (meteorobs) Seo 06/07, 1997 Observation
>
> I woke up this morning to completely clear skies. Unfortunately, I was not
> able to get a full morning of observing in due to family comitments. In a
> little less than 2 hours Teff I observed 19 meteors. A full meteor report
> with shower and magnitude breakdown will be sent to IMO.
>
> Mark Davis, MeteorObs@charlestondot net
> Mt. Pleasant, South Carolina, USA
> Coordinator, North American Meteor Network
> Assistant Coordinator, ALPO Meteors Section
> ===================================================
> NAMN home page:
> http://medicine.wustldot edu/~kronkg/namn.html
> ===================================================
>
> ------------------------------
>
> From: NTZT04A@prodigy.com ( THOMAS T WOJACK)
> Date: Sun, 7 Sep 1997 20:13:20, -0500
> Subject: RE: (meteorobs) Fireball mags...
>
> I challenge the entity that believes that the fireball I saw that I
> reported was not -15, but in the -3 to -6 range, to repeat after me,
> "WOJJO is a liar and/or has extreme halluncinations."
>
> BTW, I recently had my first ever hallucination. If you wish to hear
> about it, contact me privately.
>
> Jonathan
> NTZT04A@prodigy.com
>
> ------------------------------
>
> From: donwon1@juno.com (Conrad W Humphrey)
> Date: Sun, 07 Sep 1997 20:22:19 EDT
> Subject: Re: (meteorobs) Cc: NTZT04A@prodigy.com
>
> Henry Freedenberg <henryf@quartz.gly.fsudot edu> writes:
> >
> >Where is Truman? That name does not ring a bell. Maybe it was called
> >something else when I was growing up in Bayside.
> >
> >
>
> Hi Henry,
> Truman is in New York City, the Bronx to be precise.
>
> Clear skies,
> Conrad W. Humphrey (Amateur Astronomer)
> Donwon1@juno.com
> 40deg 43' 45" N 73deg 59' 43" W
> New York, NY
>
> ------------------------------
>
> From: NTZT04A@prodigy.com ( THOMAS T WOJACK)
> Date: Sun, 7 Sep 1997 20:28:05, -0500
> Subject: Re: (meteorobs) Fireball mags...
>
> My sky is not at all dark-- light pollution it as its' best in my
> backyard!
>
> Jonathan
>
> ------------------------------
>
> From: NTZT04A@prodigy.com ( THOMAS T WOJACK)
> Date: Sun, 7 Sep 1997 20:30:08, -0500
> Subject: Re: (meteorobs) Fireball mags...
>
> The -15 was at the edge of my vision, and part of it was obsructed.
>
> Jonathan
>
> ------------------------------
>
> From: NTZT04A@prodigy.com ( THOMAS T WOJACK)
> Date: Sun, 7 Sep 1997 20:35:56, -0500
> Subject: (meteorobs) Apology
>
> I have reviewed the -15 in my mind. I am now concluding that it was -
> 5 to -10.
>
> Jonathan
>
> ------------------------------
>
> From: donwon1@juno.com (Conrad W Humphrey)
> Date: Sun, 07 Sep 1997 21:34:30 EDT
> Subject: (meteorobs) Mini-Comet or Meteorite...
>
> Hi all,
> I just saw something that looked like a mini-comet. The time was
> 7:43 EST. It was between mags -1 and -4. I'm not sure if it was a
> mini-comet or a meteorite, but it was slow and most meteorites aren't
> slow. This object took over 2 minutes to cross my field of view and it
> looked slightly metallic. I'm also sure it wasn't a plane because planes
> don't have gaseous tails and this objects tail was about 11 degree's long
> and 2 degree's wide. The object was very thin so that made me think it
> wasn't a comet but then I remembered mini-comets can look just like
> meteorites. If anyone else in this area saw it can you confirm it for me
> or if you think that you might know what I saw can you tell me?
>
> Clear skies,
> Conrad W. Humphrey (Amateur Astronomer)
> Donwon1@juno.com
> 40deg 43' 45" N 73deg 59' 43" W
> New York, NY
>
> ------------------------------
>
> From: GeoZay@aol.com
> Date: Sun, 7 Sep 1997 21:49:55 -0400 (EDT)
> Subject: Re: (meteorobs) Fireball mags...
>
> In a message dated 97-09-07 20:36:31 EDT, you write:
>
> <<
> I challenge the entity that believes that the fireball I saw that I
> reported was not -15, but in the -3 to -6 range, to repeat after me,
> "WOJJO is a liar and/or has extreme halluncinations."
>
> BTW, I recently had my first ever hallucination. If you wish to hear
> about it, contact me privately.
>
> Jonathan >>
> - ------------
> Well Jonathan...I guess I am an entity...."WOJJO could be a liar and/or might
> have some extreme hallucinations"...is that what you want to hear?
>
> Jonathan...I think you have had more than one hallucination prior to the one
> you consider was your first.
> GeoZay
>
> ------------------------------
>
> From: psmc@ixdot netcom.screwspam.com (Paul S.M. Curran)
> Date: Mon, 08 Sep 1997 03:07:57 GMT
> Subject: Re: (meteorobs) ADULT SITE ACTION...free time..no sign-up.,.,,,.,
>
> With the regards to the ilk that are polluting our newsgroups, kicking =
> them off
> the internet will do little good. They will just come back under a =
> different
> name. Is their some type of legal action that we can take? An extremely=
> stiff
> penalty or possible prison term would do much to stop this trash. Let =
> alone the
> expenses they will incur in going to court. =20
> Paul S.M.Curran
> remove the obvious spam reference if you wish to reply by e-mail
>
> ------------------------------
>
> From: "Cathy L. Hall" <chall@cyberusdot ca>
> Date: Sun, 7 Sep 1997 23:55:21 -0400 (EDT)
> Subject: (meteorobs) Videotape - Shoemaker on impacts
>
> Greetings,
>
> Thought the following might be of interest to some of you....
>
> - - Cathy
> Great White North
>
> ********************************************
>
> Date: Sun, 07 Sep 1997 22:51:24 -0400
> From: Robert Dick <rdick@ccsdot carletondot ca>
> Reply-To: rdick@ccsdot carletondot ca
> Organization: ELPA Engineering, Carleton University Physics
> To: chall@cyberusdot ca
> Subject: Shoemaker Video Tape
>
> Shoemaker Video Tape: Impact Cratering Through Geologic Time
>
> Dr. Eugene Shoemaker, renowned geologist turned astronomer, delivered
> one of his last talks at the July, 1997 General Assembly of the Royal
> Astronomical Society of Canada. His untimely death in Australia on July
> 18, 1997 is a great loss and he will be sorely missed.
>
> Dr. Shoemaker gave the Society's Ruth Northcott Lecture titled: Impact
> Cratering Through Geologic Time. This proved to be his second last
> public appearance.
>
> ELPA Productions was on hand to videotape this presentation of Dr.
> Shoemaker's, and is making this videotape available on a cost recovery
> basis.
>
> For those who would like a copy of this lecture, it is available on VHS
> videotape for:
> 1. In Canada: $30.00 Canadian dollars
> 2. In the USA & Hawaii: $30.00 US dollars
> 3. Outside North America: $35.00 US dollars
>
> These prices include postage and handling, and any applicable Canadian
> taxes.
> Additional charges, brokerage fees and duties, are the responsibility of
> the purchaser.
>
> Shipping by courier is available for an extra charge.
>
> Tapes can be purchased on BetaCam SP and Hi-8 and in PAL format for an
> additional cost. Contact ELPA Productions for further information about
> these options.
>
> To order a VHS tape, please send a check or money order for the full
> amount to:
> ELPA Productions
> P.O. Box 79
> Rideau Ferry, Ontario
> Canada, K0G 1W0
>
> Purchase orders are not accepted. Tapes will be shipped within two
> weeks of the receipt of the order.
>
> Any questions or comments? Please contact Robert Dick at ELPA
> Productions:
> Telephone / Fax: 1 - 613 - 283 - 0362
> e-mail: rdick@ccsdot carletondot ca
> website: www.physicsdot carletondot ca/~rdick/elpaprod.htm
>
> Videotaped talks and lectures by other notable and interesting speakers
> are also available from ELPA Productions. Please visit the website for
> further details, or you can call or write.
>
> ------------------------------
>
> End of meteorobs-digest V1 #516
> *******************************
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