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Giotto carried ten scientific instruments. They included: - a narrow-angle, multicolour camera to obtain pictures of the nucleus
- three mass spectrometers to measure gas and dust composition
- a dust impact detector to measure the mass of dust particles striking the shield
- two plasma experiments to study the solar wind and charged particles
- an energetic particles analyser to study electrons, protons and alpha-particles
- a magnetometer to study changes in the magnetic field
- an optical probe to study brightness of the coma
- a radio science experiment to investigate the electron environment was also carried out by comparing signals sent at different frequencies from the spacecraft
| Experiment or instrument | Principal investigator | Institute | | MAG: Magnetometer | F.M. Neubauer | University of Cologne, Germany | | HMC: Halley Multicolour Camera | H.U. Keller | MPI, Lindau, Germany | | DID: Dust Impact Detection System | J.A.M. McDonnell | University of Kent, Canterbury, UK | | RPA: Rème Plasma Analyser | H. Rème | CESR, Toulouse, France | | JPA: Johnstone Plasma Analyser | A. Johnstone | Mullard Space Science Laboratory, Holmbury St Mary, UK | | PIA: Particulate Impact Analyser | J. Kissel | MPI, Heidelberg, Germany | | OPE: Optical Probe Experiment | A. C. Levasseur-Regourd | CNRS, Verrières-le-Buisson, France | | EPA: Energetic Particles | S.M.P. McKenna-Lawlor | St. Patrick's College, Maynooth, Ireland | | NMS: Neutral Mass Spectrometer | D. Krankowsky | MPI, Heidelberg, Germany | | IMS: Ion Mass Spectrometer | H. Balsiger | University of Bern, Switzerland | | GRE: Giotto Radio Experiment | P. Edenhofer | Ruhr University, Bochum, Germany |
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