A wide range of ion species and velocity distributions are expected to be found as the Giotto spacecraft traverses the coma of Halley's Comet. The outer coma is characterized by the interaction between solar wind and cometary plasmas, the inner coma by the outflow of cometary neutrals and their ionization products. The resultant demands on instrument dynamic range preclude use of a single sensor for measurements of ion composition. The Giotto Ion Mass Spectrometer (IMS) therefore consists of two sensors: one optimized for the outer and the other for the inner coma, with each obtaining complementary information in the region for which it is not optimized. Both sensors feature mass imaging characteristics, thereby permitting simultaneous measurements of several ion species by means of multi-detector arrays. The High Intensity Spectrometer (HIS) was designed to complement the HERS in the inner coma.

A wide range of ion species and velocity distributions are expected to be found as the Giotto spacecraft traverses the coma of Halley's Comet. The outer coma is characterized by the interaction between solar wind and cometary plasmas, the inner coma by the outflow of cometary neutrals and their ionization products. The resultant demands on instrument dynamic range preclude use of a single sensor for measurements of ion composition. The Giotto Ion Mass Spectrometer (IMS) therefore consists of two sensors: one optimized for the outer and the other for the inner coma, with each obtaining complementary information in the region for which it is not optimized. Both sensors feature mass imaging characteristics, thereby permitting simultaneous measurements of several ion species by means of multi-detector arrays. The prime objective of the High-Energy Range Spectrometer (HERS) is to measure the ion abundances and three-dimensional velocity distributions outside the cometary contact surface.

A wide range of ion species and velocity distributions are expected to be found as the Giotto spacecraft traverses the coma of Halley's Comet. The outer coma is characterized by the interaction between solar wind and cometary plasmas, the inner coma by the outflow of cometary neutrals and their ionization products. The resultant demands on instrument dynamic range preclude use of a single sensor for measurements of ion composition. The Giotto Ion Mass Spectrometer (IMS) therefore consists of two sensors: one optimized for the outer and the other for the inner coma, with each obtaining complementary information in the region for which it is not optimized. Both sensors feature mass imaging characteristics, thereby permitting simultaneous measurements of several ion species by means of multi-detector arrays. The prime objective of the High-Energy Range Spectrometer (HERS) is to measure the ion abundances and three-dimensional velocity distributions outside the cometary contact surface.

Derived, calibrated density profiles from the NMS ION and NEUTRAL sensors flown on the GIOTTO mission and obtained during the comet Halley fly-by on 13 March 1986. This data set corrects issues found in the GIO-C-NMS-4-86P-V1.0 data set.

This dataset contains results from the Implanted Ion Sensor (IIS) 4DH mode and the Fast Ion Sensor SW and HAR modes of the Three- Dimensional Particle Analyzer (JPA) experiment on the GIOTTO spacecraft for the mission to comet Halley. The results of the Fast Ion Sensor (FIS - inbound) and IIS (outbound) have been merged with results from other Giotto instruments. In the first submitted table, magnetometer measurements are included.

This dataset contains results from the Implanted Ion Sensor (IIS) 4DH mode and the Fast Ion Sensor SW and HAR modes of the Three- Dimensional Particle Analyzer (JPA) experiment on the GIOTTO spacecraft for the mission to comet Halley. The results of the Fast Ion Sensor (FIS - inbound) and IIS (outbound) have been merged with results from other Giotto instruments. In the first submitted table, magnetometer measurements are included.

This data set lists counts as a function of either angular position or energy level. The data were obtained from the Ion Mass Spectrometer (IMS) High Intensity Spectrometer (HIS) instrument flown aboard the GIOTTO spacecraft during its extended mission to fly by comet 26P/Grigg-Skjellerup. These data have not been formally reviewed by PDS.

This data set lists counts as a function of either angular position or energy level. The data were obtained from the Ion Mass Spectrometer (IMS) High Intensity Spectrometer (HIS) instrument flown aboard the GIOTTO spacecraft during its extended mission to fly by comet 26P/Grigg-Skjellerup. These data have not been formally reviewed by PDS.

Mass spectrometric measurements of ions in the coma of comet Giacobini-Zinner made during the encounter of the International Cometary Explorer (ICE) on 11 September 1985, when the spacecraft passed within 7800 km of the nucleus on its antisunward side.

Mass spectrometric measurements of ions in the coma of comet Giacobini-Zinner made during the encounter of the International Cometary Explorer (ICE) on 11 September 1985, when the spacecraft passed within 7800 km of the nucleus on its antisunward side.