Microbarometer network

The purpose of this experiment is to monitor thunder when lightning flash occur within 50 km around the network. <br />
Low resolution data of all the campaign is provided (at 0.1 Hz). <br />
Full resolution data (50 Hz) are distributed for the following periods where at least 20 lightning flashes were detected by EUCLID within 50 km around the sensor in one hour:<br />
30-Aug-2012 from 01:00 UT to 04:59 UT<br />
30-Aug-2012 from 14:00 UT to 14:59 UT<br />
05-Sep-2012 from 17:00 UT to 17:59 UT<br />
11-Sep-2012 from 15:00 UT to 15:59 UT<br />
24-Sep-2012 from 01:00 UT to 07:59 UT<br />
25-Sep-2012 from 09:00 UT to 12:59 UT<br />
26-Sep-2012 from 06:00 UT to 07:59 UT<br />
26-Sep-2012 from 13:00 UT to 13:59 UT <br />
26-Sep-2012 from 16:00 UT to 16:59 UT <br />
29-Sep-2012 from 17:00 UT to 18:59 UT <br />
30-Sep-2012 from 00:00 UT to 01:59 UT <br />
21-Oct-2012 from 19:00 UT to 19:59 UT <br />
21-Oct-2012 from 22:00 UT to 22:59 UT <br />
22-Oct-2012 from 20:00 UT to 20:59 UT <br />
22-Oct-2012 from 23:00 UT to 23:59 UT <br />
26-Oct-2012 from 16:00 UT to 22:59 UT<br />
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Observing strategy: <br />
Relative atmospheric pressure is measured with a microbarometer which is able to monitor infrasound (10-3 - 30 Hz). The sampling frequency is 50 Hz.Four sensors are set up in a equilateral triangle of ~500 m baseline with a sensor in its barycenter. Correlation between simultaneously recorded waveforms is performed to detect any coherent acoustic wave which propagates over the network. Azimuth and horizontal velocity of detected waves can then be calculated.