imc 2012 – la palma – 21/09/2012 brams, the belgian radio meteor stations : latest developments...
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IMC 2012 – La Palma – 21/09/2012
BRAMS, the Belgian Radio BRAMS, the Belgian Radio Meteor Stations : Meteor Stations :
latest developmentslatest developments
Hervé LamyHervé Lamy
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IMC 2012 – La Palma – 21/09/2012
BRAMS teamBRAMS team
• Hervé Lamy• Sylvain Ranvier• Emmanuel Gamby• Stijn Calders• Michel Anciaux• Johan De Keyser• Yves Geunes
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IMC 2012 – La Palma – 21/09/2012
Radio forward-scattering observationsRadio forward-scattering observations
Wislez et al (1996)
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IMC 2012 – La Palma – 21/09/2012
Network of 22 radio receiving stationsNetwork of 22 radio receiving stations
Future stations :
• Genk
• Leuze
• Oostende
• Seneffe
• Lille
+ Jean-Louis
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IMC 2012 – La Palma – 21/09/2012
A typical receiving stationA typical receiving station
AGC switched off
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IMC 2012 – La Palma – 21/09/2012
SpectrogramsSpectrograms
Data saved in WAV files, sent to BISA by USB sticks and archived
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IMC 2012 – La Palma – 21/09/2012
The BRAMS viewer (1)
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IMC 2012 – La Palma – 21/09/2012
The BRAMS viewer (2)
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IMC 2012 – La Palma – 21/09/2012
The BRAMS viewer (3)
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IMC 2012 – La Palma – 21/09/2012
The BRAMS viewer (4)
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IMC 2012 – La Palma – 21/09/2012
Determination of trajectoriesDetermination 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 Ri (Nedeljkovic 2006)
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IMC 2012 – La Palma – 21/09/2012
Determination of trajectories (2)Determination of trajectories (2)
• Student from ULB
• « Direct » problem : find the position of specular point knowing positions of T, Ri 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 Ri 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..)
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IMC 2012 – La Palma – 21/09/2012
Other works in progressOther 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)
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IMC 2012 – La Palma – 21/09/2012
VLF/VHF observations of meteors
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IMC 2012 – La Palma – 21/09/2012
Meteor radar in DourbesMeteor 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
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IMC 2012 – La Palma – 21/09/2012
BRAMS : the websiteBRAMS : the website
http://brams.aeronomy.behttp://brams.aeronomy.be