Synthesis of the morphological description of cometary dust at comet 67P/Churyumov-Gerasimenko

Before Rosetta, the space missions Giotto and Stardust shaped our view on cometary dust, supported by plentiful data from Earth based
observations and interplanetary dust particles collected in the Earth’s atmosphere. The Rosetta mission at comet 67P/Churyumov-
Gerasimenko was equipped with a multitude of instruments designed to study cometary dust. While an abundant amount of data
was presented in several individual papers, many focused on a dedicated measurement or topic. Different instruments, methods, and
data sources provide different measurement parameters and potentially introduce different biases. This can be an advantage if the
complementary aspect of such a complex data set can be exploited. However, it also poses a challenge in the comparison of results in
the first place. The aim of this work therefore is to summarize dust results from Rosetta and before.We establish a simple classification
as a common framework for intercomparison. This classification is based on the dust particle structure, porosity, and strength and also
on its size. Depending on the instrumentation, these are not direct measurement parameters, but we chose them because they were the
most reliable for deriving our model. The proposed classification has proved helpful in the Rosetta dust community, and we offer it
here also for a broader context. In this manner, we hope to better identify synergies between different instruments and methods in the
future.