Harnessing infrasound: Tracking space debris for a safer earth
Scientists are exploring the possibility of using infrasound to track the fall of space debris. New methods could help precisely determine the trajectories of these objects.
Key information
- Infrasound can help track the fall of space debris.
- A network of sensors monitoring nuclear tests also records meteor sounds.
- Research indicates the need to consider the trajectories of objects in analyses.
Every year, thousands of tonnes of cosmic dust and about 55 tonnes of meteorites fall to Earth. Among them is space debris, such as rocket remains or satellite fragments. Scientists are searching for new methods to effectively track these objects and predict their trajectories.
Elizabeth Silber from Sandia National Laboratories in the USA studied the application of infrasound sensors for tracking meteoroids.These sensors record low-frequency sounds that are generated when an object enters the atmosphere. Shock waves generated by meteoroids can be detected over thousands of kilometres.
However, when a meteoroid enters the atmosphere at a shallow angle, analysing infrasound signals becomes more challenging. Different stations may receive signals from various directions, making it difficult to accurately determine the trajectory. Silber's research indicates that with an angle greater than 60 degrees, the analysis is more precise.
CTBTO sensor network
Infrasound sensors are part of a network managed by the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO). Although their main task is to monitor nuclear tests, they also record other sounds, such as thunder or supersonic aircraft.
The research findings presented during the European Geosciences Union Congress emphasise the need to consider the trajectories of objects in infrasound analyses. This could aid in better tracking space debris and protecting our planet from their effects.
