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| Titel |
Secondary charging effects due to icy dust particle impacts on rocket payloads |
| VerfasserIn |
M. Kassa, M. Rapp, T. W. Hartquist, O. Havnes |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 30, no. 3 ; Nr. 30, no. 3 (2012-03-01), S.433-439 |
| Datensatznummer |
250017191
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| Publikation (Nr.) |
 copernicus.org/angeo-30-433-2012.pdf |
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| Zusammenfassung |
| We report measurements of dust currents obtained with a small probe and a
larger probe during the flight of the ECOMA-4 rocket through the summer
polar mesosphere. The payload included two small dust probes behind a larger
dust probe located centrally at the front. For certain phases of the payload
rotation, the current registered by one of the small dust probes was up to 2
times the current measured with the larger probe, even though the effective
collection area of the larger probe was 4 times that of the small one. We
analyze the phase dependence of the currents and their difference with a
model based on the assumption that the small probe was hit by charged dust
fragments produced in collisions of mesospheric dust with the payload body.
Our results confirm earlier findings that secondary charge production in the
collision of a noctilucent cloud/Polar Summer Mesospheric Echo (NLC/PMSE)
dust particle with the payload body must be several orders of magnitude
larger than might be expected from laboratory studies of collisions of pure
ice particles with a variety of clean surfaces. An important consequence is
that for some payload configurations, one should not assume that the current
measured with a detector used to study mesospheric dust is simply
proportional to the number density of ambient dust particles. The higher
secondary charge production may be due to the NLC/PMSE particles containing
multiple meteoric smoke particles. |
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