The particle charging group has come to the conclusion that copper microparticles are sufficiently good for the experiment, and will be released into the mesophere. There are many interesting particles on the market, but the cheapest ones concidered that would work for the experiment are copper particles. Radius of the microparticles will be 0.1 µm.
The next step for the particle charging group is to find out how to relate measured radar signal to dust particle caracteristics.
In order to validate theoretical models of polar mesospheric summer echoes (which is the purpose of the SCRAP experiment) to radar measurements, there must be a way of relating measured signal to the caracteristics of the dust cloud released into the mesosphere. This can be done through properties such as the scattering cross-section of the microparticle dust cloud.
Figure shows the scattering cross-section of the dust cloud as funcion of microparticle radius, photoelectic property SY of microparticles and mesospheric electron density n.
/ The SCRAP team