Neutral

Figure 1. The impact signals of MDC NOZOMI. There are three signals corresponding to ion, electron, and neutral channels, (a) Impact on 98-07-28. According to preliminary estimates, mass and velocity are l.lxl0"13kg and 7.5 km s"1, respectively. There is a two-stage rise of the impact charge in the electron channel signal, which would indicate the secondary impact of impact ejecta in the sensor box. (b) Impact on 99-03-01 (B in Figure 3(b)). According to preliminary estimates, mass and velocity are l.lxlO"19 kg and 60 km s"1, respectively. This is an interstellar particle.

signal, mass and velocity of the particle can be obtained using laboratory calibration data. For example at velocity 10 km s"1, we can determine the mass of particles approximately between 5 x 10"18 and 10"13 kg, corresponding to a particle diameter range between 0.1 and 10/xm.

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