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EISCAT observations of meteoric fragmentation Johan Kero, Csilla Szasz and Asta Pellinen-Wannberg (Swedish Institute of Space Physics, Kiruna, Sweden)

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Presentation on theme: "EISCAT observations of meteoric fragmentation Johan Kero, Csilla Szasz and Asta Pellinen-Wannberg (Swedish Institute of Space Physics, Kiruna, Sweden)"— Presentation transcript:

1 EISCAT observations of meteoric fragmentation Johan Kero, Csilla Szasz and Asta Pellinen-Wannberg (Swedish Institute of Space Physics, Kiruna, Sweden) Gudmund Wannberg and Assar Westman (EISCAT Scientific Association, Kiruna, Sweden)

2 Outline of the talk Meteoric fragmentation processes –From fireballs to dust... Observations with EISCAT –Fragmentation of small meteoroids...

3 Optical brightness pulsations 2004-11-21 Leonid campaign with ALIS ACKNOWLEDGEMENTS: Björn Gustavsson and the ALIS team

4 Fireball flickering Peekskill, October 9, 1992

5 Forms of fragmentation Table from Bronshten, Physics of Meteoric Phenomena, Kluwer, 1983

6 EISCAT VHF:2003-11-26 EISCAT UHF:2004-12-21 2005-06-21 2005-09-22 (?)

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14 TROMSØ

15 Assumption: One meteoroid broke up into two major fragments Conclusions that may be drawn under the assumption is that the separation... photo: Csilla Szasz...distance was increasing with constant acceleration 0.88 km/s 2...occurred 0.1 s eller 4 km before they reached the centre of the radar beam...distance was 1.6 m when they entered the radar beam...distance was 9.6 m when they left the radar beam

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