Demeter - listening out for the variations in the electrical field
That is where, at an altitude of more than 600 km, Demeter’s large 4-metre antennas are listening out for the tiniest variations in the planet’s electrical field.
This figure shows a drop in the intensity of waves measured by Demeter across a frequency range of 500 Hz to 1 kHz; the drop starts about 10 hrs before earthquakes and continues up to 2 hrs afterwards.
Over the same timeframe, we see an increase in intensity at frequencies between 4 kHz and 10 kHz. A 3rd disturbance is recorded across the full range of frequencies about 24 hrs after quakes.
An exploratory mission
However, no scientific paper based on these data has yet been published in a peer-reviewed journal, which is a vital step toward validating results, especially on a topic so keenly debated within the scientific community.
It is also essential to understand the origin of such possible tell-tale warning signs.
Alongside its prime science mission, Demeter is also the 1st satellite to fly and test out the Myriade microsatellite bus.