Figure 3. The charge measured at the small target (trianagles) versus the charge measured at the large target (diamonds) is shown.

Figure 2 also shows the interstellar flux of dust particles assuming that the interstellar particles move on straight trajectories through the inner solar system. According to this model, the interstellar particle flux varies between 0.5 and 2 particles per day and overestimates the measured flux slightly. However, the interstellar flux model was constructed from data measured outside 2.5 AU [7], Since solar radiation pressure and the magnetic field in the heliosphere, tend to decrease the flux in the inner solar system [7], the interstellar flux shown in Figure 2 must be understood as an upper bound of the real flux. Therefore the gap between measured data and the Staubach model can be explained with interstellar particles.

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