IMC 2012 – La Palma – 21/09/2012 BRAMS, the Belgian Radio Meteor Stations : latest developments Hervé Lamy.

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Presentation transcript:

IMC 2012 – La Palma – 21/09/2012 BRAMS, the Belgian Radio Meteor Stations : latest developments Hervé Lamy

IMC 2012 – La Palma – 21/09/2012 BRAMS team Hervé Lamy Sylvain Ranvier Emmanuel Gamby Stijn Calders Michel Anciaux Johan De Keyser Yves Geunes

IMC 2012 – La Palma – 21/09/2012 Radio forward-scattering observations   Wislez et al (1996)

IMC 2012 – La Palma – 21/09/2012 Network of 22 radio receiving stations Future stations : Genk Leuze Oostende Seneffe Lille + Jean-Louis

IMC 2012 – La Palma – 21/09/2012 A typical receiving station AGC switched off

IMC 2012 – La Palma – 21/09/2012 Spectrograms Data saved in WAV files, sent to BISA by USB sticks and archived

IMC 2012 – La Palma – 21/09/2012 The BRAMS viewer (1)

IMC 2012 – La Palma – 21/09/2012 The BRAMS viewer (2)

IMC 2012 – La Palma – 21/09/2012 The BRAMS viewer (3)

IMC 2012 – La Palma – 21/09/2012 The BRAMS viewer (4)

IMC 2012 – La Palma – 21/09/2012 Determination of trajectories From multi-stations observations of the same meteor Meteor path must be tangent to a set of ellipsoids whose focii are the transmitter T and the various receiving stations R i (Nedeljkovic 2006)

IMC 2012 – La Palma – 21/09/2012 Determination of trajectories (2) Student from ULB « Direct » problem : find the position of specular point knowing positions of T, R i and meteor path + calculate t « Inverse » problem : among « all » possible meteor paths, find those who are tangent to a number of ellipsoids knowing T and R i  many many solutions ….decreases slowly with number of stations. To be done : take into account the real t observed (difficulty : be sure we’re talking about the same meteor..)

IMC 2012 – La Palma – 21/09/2012 Other works in progress Calculation of the OF for meteor showers (see presentation of Stijn Calders and early application to the Draconids 2011) Radio polarisation measurements of meteor trail echoes (see presentation of Sylvain Ranvier and application to the Perseids 2012)

IMC 2012 – La Palma – 21/09/2012 VLF/VHF observations of meteors

IMC 2012 – La Palma – 21/09/2012 Meteor radar in Dourbes Goal : study of meteors, comparison of fluxes with forward & back scatter systems Status : preliminary design done, material is being procured, work should start in spring 2013

IMC 2012 – La Palma – 21/09/2012 BRAMS : the website