* Astronomy

Blobrana · L

RE: Reisadalen Impact

Blobrana · L

Reisadalen meteor photo:

Røykstripen etter ildkulen (midt på bildet).
Credit: Martin Lyngdal, Pollen i Lyngen

Blobrana · L

Another article about the Reisadalen Impact.

- Er meteoritten i det øvre sjiktet av størrelsesordenen jeg tror den ligger i, kan kraften i nedslaget sammenliknes med Hiroshima-bomben, sier Ødegaard.

Nothing new, but there is an image of Astronomer Knut Jørgen Røed Ødegaard

-- Edited by Blobrana at 00:05, 2006-06-11

Blobrana · L

Blobrana · L

A few people are suggesting that it was 3 metre wide stony meteor, (though i suspect it was probably twice that size). The original Astronomer who made the initial claims seems to have `subdued` his original assessment of a Hiroshima sized meteor.

(Though, 15 megatons was probably the top end of the range estimate, imho. A smaller metre wide stony iron meteor, i reckon, is perhaps the bottom range.)

A series of images showing an airburst.

Credit: Peter Bruvold

Web Link:

-- Edited by Blobrana at 20:53, 2006-06-10

Blobrana · L

Another article...

Natt til onsdag 7. juni skjedde det trolig suverent voldsomste meteoritt-nedslag i Norge i moderne tid. Kl. 02.05 kunne folk i nordlige deler av Troms og i vestlige deler av Finnmark observere en ekstrem ildkule som for over himmelen på noen sekunder. Noen minutter senere nådde et intenst drønn bakken og vekket folk. I hvert fall ett sted dundret det slik at et hus ristet og gardinene i et åpent vindu ble blåst inn i rommet. NORSAR registrerte et kraftig lydfenomen på sin målestasjon i Karasjok og dessuten seimiske forstyrrelser

Source

Blobrana · L

The small crater found has been found....

See more

Credit: OLA SOLVANG / NORDLYS

-- Edited by Blobrana at 00:26, 2006-06-10

Blobrana · L

At least once a year a 6 metre wide space rock object will enter the Earths atmosphere, releasing a blast equal to a 15-kiloton nuclear explosion.
Nuclear warhead (of one kiloton, 1000 tons of high explosive) sized explosions are even more common.
Between 1975 to 1992, for example, secret military satellite data recorded 136 explosions high in the atmosphere - about eight big explosions a year. The blasts varied from 500 to 15,000 tons of high explosive.
Hiroshima is taken to be a 15 kiloton explosion.

The unusual thing about the Reisadalen event was that it seems to have reached the ground.

Blobrana · L

In the course of several thousand years, the Reisa river has cut a deep cleft in the mountain plateau to create the long fertile valley of Reisadalen. Great waterfalls cascade into the valley – the 269 m high Mollis falls are particularly impressive, and at the Imo waterfalls two tributaries cascade down the vertical granite face to join the main river in a narrow ravine where numerous potholes have been scoured out. North of Imo, the valley sides rise precipitously to create a deep canyon.

Two billion years of geological history can be read in the sheer walls of rock beside the river: granite and gneiss bedrock at he base, covered with a 200 m thick deposit of shales and sandstone (known geologically as the Dividal group), over which other rock types were pushed or slid into place 400 mill. years ago. At Avvekløfta the whole sequence is clearly visible. Further up the valley, the landscape changes into an open sparse moorland.

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Blobrana · L

Impact direction

(200kb,802 x 517 .gif)

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