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R. Srama, A. Graps, E. Gruen, S. Helfert, S. Kempf, H. Krueger (Max-Planck-Institut fuer Kernphysik), CDA-dust-science Team
During 85 days of operation CDA (DOY 84 to DOY 169, 1999) recorded 33 highly reliable impact events including one impact with a high quality mass spectrum and 5824 noise events. The impact rate during the inner planetary cruise is compared with the calculated count rates of the Divine-Staubach model. During approach to th Sun, a slight increase of the CDA count rate from about 2 impacts per week to 3 impacts per week was observed. According to the model, before Venus 2 encounter until DOY 140, interstellar dust flux tops the interplanetary dust flux. After that time, interplanetary dust should be the dominant component in the CDA measurements. The observed impact rate supports this picture although the measured impact rate is somewhat lower than the combined interstellar plus interplanetary model flux but higher than the interplanetary flux alone. Therefore, the measurements suggest that a significant portion of the interstellar dust flux reaches the region inside the Earth's orbit.
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The author(s) of this abstract have provided an email address for comments about the abstract: ralf.srama@mpi-hd.mpg.de