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2.1.2 Preliminary Results of the Micrometeoroid Experiment on Board Helios A

Published online by Cambridge University Press:  12 April 2016

E. Grün ,
J. Kissel ,
H. Fechtig ,
P. Gammelin  and
H.-J. Hoffmann
E. Grün
Affiliation:
Max-Planck-Institut für Kernphysik, Heidelberg, F.R.G.
J. Kissel
Affiliation:
Max-Planck-Institut für Kernphysik, Heidelberg, F.R.G.
H. Fechtig
Affiliation:
Max-Planck-Institut für Kernphysik, Heidelberg, F.R.G.
P. Gammelin
Affiliation:
Max-Planck-Institut für Kernphysik, Heidelberg, F.R.G.
H.-J. Hoffmann
Affiliation:
Physikalisches Institut, Rheinische Friedrich-Wilhelms-UniversitätBonn/F.R.G.

Abstract

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For the first time in situ measurements of interplanetary dust have been performed between 0.3 AU and 1 AU from the sun by the micrometeoroid experiment on board Helios A. The measured particle masses are between 10−15 g and 10−8 g and their measured speeds are between 2 km/sec and 20 km/sec. Particle impacts are identified by the time-of-flight spectra of the ions released upon impact. 15 large particles (m ≥ 10−12 g) were detected from Dec. 15, 1974 to Sept. 5, 1975. They show a strong increase of the impact rate (appr. a factor of 10) between 1 AU and 0.3 AU. The directions from which they impacted the sensor are concentrated between the solar direction and the apex direction of the Helios spacecraft.

Type
2 In Situ Measurements of Interplanetary Dust
Information
International Astronomical Union Colloquium , Volume 31: Interplanetary Dust and Zodiacal Light , 1976 , pp. 159 - 163
Copyright
Copyright © Springer-Verlag 1976

References

Berg, O.E., and Grün, E. (1973), “Evidence of hyperbolic cosmic dust particles”, Space Research XIII, 1047.Google Scholar
Dietzel, H., Eichhorn, G., Fechtig, H., Grün, E., Hoffmann, H.-J., and Kissel, J. (1973), “The HEOS and Helios Micrometeoroid Experiments”, J. Phys. E: Scient. Instrum. 6, 209.Google Scholar
Link, H., Leinert, C., Pitz, E., and Salm, N. (1976), “Preliminary Results of the Helios A Zodiacal Light Experiment”, This volume.Google Scholar