Physics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jphe...20..721r&link_type=abstract
Journal of Physics E - Scientific Instruments (ISSN 0022-3735), vol. 20, pt. 2, June 1987, p. 721-731. Research supported by the
Physics
14
Electron Plasma, Field Of View, Giotto Mission, Plasma Interactions, Solar Wind, Space Probes, Comet Tails, Electron Energy, Interplanetary Medium, Neutral Gases, Planetary Ionospheres, Planetary Magnetic Fields
Scientific paper
The RPA-Copernic experiment aboard Giotto is described. The experiment is designed to measure the three-dimensional distributions of electrons between 10 eV and 30 keV (by the RPA-1 EESA spectrometer) and the composition and distribution, close to the comet, of thermal positive ions in the mass range 10-213 amu (by the RPA-2 PICCA electrostatic mass analyzer). Three microprocessors interface RPA-1 EESA with RPA-2 PICCA and with the spacecraft and perform extensive onboard data processing. The experiment was operated successfully aboard the spacecraft in September 1985 during the encounter of Giotto with the comet Halley. The results provided by the EESA-1 indicate that the solar wind interaction with the comet Halley forms a well-defined bow shock with features quite different from the features of the comet Giacobini-Zinner bow shock; the data also showed a presence of accelerated keV electrons at the cometary bow shock, upstream and in the transition region.
Cotin F.
Cros Alain
Medale Jean-Louis
Reme Henri
Sauvaud Jean-Andre
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