Context. The electrostatic potential of a spacecraft, VS, is important for the capabilities of in
situ plasma measurements. Rosetta has been found to be negatively charged during most of
the comet mission and even more so in denser plasmas. Aims. Our goal is to investigate
how the negative VS correlates with electron density and temperature and to understand the
physics of the observed correlation. Methods. We applied full mission comparative statistics
of VS, electron temperature, and electron density to establish VS dependence on cold and …

Context. The electrostatic potential of a spacecraft, VS, is important for the capabilities of in
situ plasma measurements. Rosetta has been found to be negatively charged during most of
the comet mission and even more so in denser plasmas. Aims. Our goal is to investigate
how the negative VS correlates with electron density and temperature and to understand the
physics of the observed correlation. Methods. We applied full mission comparative statistics
of VS, electron temperature, and electron density to establish VS dependence on cold and …