Autor Thema: BBC - Horizon - 1999 - New Asteroid Danger  (Gelesen 2459 mal)

Offline karmaka

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BBC - Horizon - 1999 - New Asteroid Danger
« am: September 08, 2011, 17:25:11 Nachmittag »
Ein Webfund von heute: eine alte BBC Horizon Episode von 1999.

BBC - Horizon - 1999 - New Asteroid Danger

Unter anderem mit einem Interview mit den Zeugen des Wetherfield Falls am 8.11.1982  (in Teil 1)  
und der wunderbaren Musik von Mrs.Gerrard and Mr. Perry. :wow:

Wetherfield
( http://www.lpi.usra.edu/meteor/metbull.php?sea=1982&sfor=text&ants=no&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=Normal%20table&code=24251 )

Teil 1: http://www.youtube.com/watch?v=OCy75Yf1af8
Teil 2: http://www.youtube.com/watch?v=CdpIbFkrZyQ
Teil 3: http://www.youtube.com/watch?v=d64333YGNVY
Teil 4: http://www.youtube.com/watch?v=tyF6WhwRK2g  (dieser Film scheint aus Deutschland nicht abrufbar zu sein  :platt:)

Viele Grüße

Martin
« Letzte Änderung: September 08, 2011, 18:03:06 Nachmittag von karmaka »

Offline karmaka

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Re: BBC - Horizon - 1999 - New Asteroid Danger
« Antwort #1 am: September 09, 2011, 00:33:43 Vormittag »
In der interessanten 3. Folge geht es übrigens um die Untersuchung des Wabar Kraters und
das 'Brazilian Tunguska' oder Rio Curaca Ereignis am 13.8.1930.

Zitat
August 13, 1930. Upper reaches of the Brazilian Amazon. In SF#102, we provided a short notice of a probable large bolide impact near Brazil's border with Peru. Apparently, this event resembled the much more famous 1908 Tunguska blast. More details have now been provided by M.E. Bailey et al in the Observatory, as based on old accounts that appeared in the British Daily Herald and the papal newspaper L'Osservatore Romano. Bailey et al write:

    "The Daily Herald report [March 6, 1931] describes the fall of 'three great meteors...[which]...fired and depopulated hundreds of miles of jungle...The fires continued uninterrupted for some months, depopulating a large area.' Unfortunately, although the fall is said to have occurred around "8 o'clock in the morning" and to have been preceded by remarkable atmospheric disturbances (a 'blood-red' Sun, an ear-piercing 'whistling' sound, and the fall of fine ash which covered trees and vegetation with a blanket of white), few details are provided that constrain the time and place of the event. Nevertheless, the story refers to an article in the papal newspaper L'Osservatore Romano [March 1, 1931], apparently written by a Catholic missionary 'Father Fidello, of Aviano', and it is to this that we now turn.

Apparently, there were three bolides or fireballs seen. Father Fidello wrote:

    "They landed in the centre of the forest with a triple shock similar to the rumble of thunder and the splash of lightning. There were three distinct explosions, each stronger than the other, causing earth tremors like those of an earthquake. A very light rain of ash continued to fall for a few hours and the sun remained veiled till midday. The explosions of the bodies were heard hundreds of kilometres away." (Ref.1)

M.E. Bailey singles out two puzzling features of the Brazilian event: (1) the fall of dust before the fireballs were observed; and (2) the lack of any mention of a blast wave. Further, the L'Osservatore Romano account does not say anything about extensive forest fires. (Ref. 1; see Ref. 2 for a synopsis.)

Quelle: http://www.science-frontiers.com/sf103/sf103g08.htm

Zitat
The Rio Curaca event

In 1989 an article by N.Vasilyev and G.V. Andreev in the IMO Journal (1) drew attention to a discussion, published in 1931 by L.A. Kulik (2), of a possible Brazilian counterpart to the Tunguska bolide explosion of 1908. The Brazilian event, which occurred on August 13, 1930, was described in the papal newspaper L'Osservatore Romano, the report being derived from Catholic missionaries working in Amazonia. That report, in Italian, was used as the basis of a front-page story in the London newspaper The Daily Herald (since closed down), which was published on March 6, 1931, and then seen by Kulik. (For the interested reader, a copy of the story is reprinted in the December 1995 Journal).

The locality of the explosion gives it it's name: The Rio Curaca event. This is close to the border between Brazil and Peru, at Latitude: 5 degrees South, Longitude: 71.5 degrees West.

Both of these newspaper stories were discussed in a recent paper by Bailey and co-workers (4), who provide an English translation of the story which appeared in L'Osservatore Romano. Since that paper should be accessible to many readers of WGN, I will not give an extensive account of it here. I will, however, just mention that although the eye-witness accounts give do cover the phenomena which one might expect to be produced by a massive bolide, there are some other interesting reported observation which would require some explanation. These include the following:

    An ear-piercing "whistling" sound, which might be understood as being a manifestation of the electrophonic phenomena which have been discussed in WGN over the past few years.
    The sun appearing to be "blood-red" before the explosion. I note that the event occurred at about 8h local time, so that the bolide probably came from the sunward side of the earth. If the object were spawning dust and meteoroids-- that is, it was cometary in nature--then, since low-inclination, eccentric orbits produce radiants close to the sun, it might be that the solar coloration (which, in this explanation, would have been witnessed elsewhere) was due to such dust in the line of sight to the sun. In short, the earth was within the tail of the small comet, if this explanation is correct.
    There was a fall of fine ash prior to the explosion, which covered the surrounding vegetation with a blanket of white: I am at a loss with regard to this, if the observation is correct (and not mis-remembered as being prior-, rather than post-impact).

Bailey et al. also discuss the fact that the Rio Curaca event occurred on the day of the peak of the annual Perseid meteor shower, but conclude that this is likely to be purely a coincidence. The date is also close to august 10, on which day in 1972 a large bolide was filmed skipping through the upper atmosphere above western Wyoming and Montana, departing from the earth above Canada (4). Again, this may be merely a coincidence.

A brief discussion of the event is also given by R. Gorelli in august 1995 issue of Meteorite! magazine.
Quelle: http://www.xtec.es/recursos/astronom/craters/amazonase.htm

Von dem hatte ich bisher übrigens noch nie etwas gehört.  :nixweiss:

In der ersten Folge geht es übrigens auch um die Nullarbor Ebene in Australien.

 :hut:

Martin

 

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