A dataset provided by the European Space Agency

Mission GIOTTO
URL ftp://npsa01.esac.esa.int/pub/mirror/GIOTTO/IMS/GIO-C-IMS-3-RDR-HERS-HALLEY-V1.0
DOI https://doi.org/10.5270/esa-w7yyyyo
Abstract The GIO-C-IMS-3-RDR-HERS-HALLEY-V1.0 data set contains the calibrated data from the Ion Mass Spectrometer, High Energy Range, instrument on board of the GIOTTO spacecraft of the European Space Agency. The data were obtained during the GIOTTO flyby on comet Halley in March 1986.
Description Data Set Overview = 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. Sampling Parameter Name : TIME Sampling Parameter Resolution : 64.0 Minimum Available Sampling Int : 16.0 Sampling Parameter Unit : SECOND Data Set Parameter Name : COUNTS Data Set Parameter Unit : SEC**-1
Instrument IMS
Temporal Coverage 1986-03-13T18:30:06.000Z/1986-03-14T00:00:58.000Z
Version V1.0
Mission Description Mission Overview In 1978,ESA was invited by NASA to plan a joint mission consisting of a comet Halley fly-by in November 1985 and a rendezvous with comet Tempel 2 in 1988. The mission comprised an American main spacecraft which would carry a European probe. The main spacecraft, with its array of sophisticated cameras and experiments, would complete a fly-by of comet Halley at a safe distance. Shortly before fly-by, the probe would be released towards the nucleus to make detailed in-situ observations in the innermost coma. In January 1980, however, it became clear that financial support for the Halley Fly-by/Tempel 2 Rendezvous mission could not be secured in the USA. By that time the interest of European scientists had built up such momentum that ESA considered the possibility of a purely European mission. The support for a fly-by mission was strong in Europe and went far beyond the small section of scientists specialised in cometary research. A fly-by of comet Halley was suggested to ESA by the scientific community in February 1980. Rather than having the American spacecraft deliver the probe to the comet as in the earlier concept, the Europeans proposed that the capabilities of the small probe be increased by building an independent, self-sufficient spacecraft to be launched using the European Ariane rocket. The limited time available for development and the small financial resources made it advisable to use a spin-stabilised spacecraft derived from the European Earth orbiting spacecraft Geos. This proposal was studied by ESA in the first half of 1980. The European mission to comet Halley was named Giotto after the Italian painter Giotto di Bondone who depicted comet Halley as the `Star of Bethlehem' in one of his frescoes in the Scrovegni chapel in Padua in 1304. The Giotto mission was finally approved as ESA's first interplanetary mission on 7 July 1980. An Announcement of Opportunity was issued ...
Date Published 2004-03-26
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2004-03-26, GIO-C-IMS-3-RDR-HERS-HALLEY, V1.0. https://doi.org/10.5270/esa-w7yyyyo