New shelter for the computers
- A new shelter has been built and installed close to the VLF antenna,
in order to put the PCs and data logger of the VLF AWDA antenna.
Tests in a quarry
- A quarry located a few kilometers from the Humain observatory would like to extend,
in the direction of the observatory. It could strongly disturb our VLF measurements
(as well as other measurements done in Humain). Some tests of electromagnetic
perturbations and meteorological disturbances have been decided and are now ongoing
near the quarry.
- The pictures below show the quarry and the tests antennas.
Tests in a farm
- A farm located in the protected area around the Humain observatory would like to extend
its size and capacitiy of production and storage of cow milk. In order to check if this
extension would disturb our measurements, we have decided to make some tests and
verifications. We have done some electromagnetic tests at the farm in Humain, but also
in another farm, which has already installed the same material the other farm wants to buy.
- The pictures below show the tests in both farms.
[7 April 2011]
1st spectrogram in Humain
- The first VLF data of Humain were recorded on 7 April 2011 at 17:00 UT.
- The picture below shows one of the first examples of magnetic field spectrogram recorded at
Humain with the VLF antenna built by BIRA-IASB. A whistler is clearly observed on both spectrograms
(East-West on bottom panel and North-South on top panel).
- The hardware has been implemented during winter 2010-2011. After some tests,
the data acquisition is ready to start !!
[12 October 2010]
VLF antenna in Humain
- The VLF antenna has been installed in Humain. It is a magnetic
field loop type of antenna with an area of about 50 square meters.
The mast is 12 meters high.
- The primary goal of this antenna is to detect whistlers but since
it will be located next to our future VHF interferometer, we will
look for conjunctions of VLF emissions and VHF meteor echoes (as
was done during dedicated campaigns by Jean-Louis Rault).
- The pictures below show the two perpendicular loops oriented
North-South and East-West, which will allow us to measure both components
of the magnetic field (or listen to the VLF emissions in stereo).
[12 August 2010]
Recent news about the AWDA project
- Tranches have been digged and concrete blocks have been made. At
the end of Summer 2010 we will install the VLF antenna. Below are
some pictures of the works.
Content manager: Fabien Darrouzet