A dataset provided by the European Space Agency

Mission GIOTTO
URL ftp://npsa01.esac.esa.int/pub/mirror/GIOTTO/MAG/GIO-C-MAG-4-RDR-8SEC-HALLEY-V1.0
DOI https://doi.org/10.5270/esa-2c1d9js
Abstract The GIO-MAG-4-RDR-8SEC-HALLEY-V1.0 data set contains the calibrated magnetometer data obtained from the magnetometer on board of the GIOTTO spacecraft of the European Space Agency. The data was obtained during the GIOTTO flyby on comet Hally in March 1986
Description Data Set Overview = The main objective of the Giotto Magnetometer Experiment is the investigation of the interaction between Comet Halley and the solar wind at a distance of 0.9 AU from the Sun, to within 500 km of the cometary nucleus. A second objective is the study of the interplanetary magnetic field. The instrumentation consists of a triaxial and a separate biaxial system of fluxgate sensors of the ring-core type, the associated analogue electronics and a digital pro- cessor. The measuring ranges of +/- 16 nT, +/- 64 nT, etc., up to +/- 65536 nT are digitis- ed by a 12-bit analogue-to-digital converter, allowing a sampling rate of 28.24 vectors per second at encounter. Memory modes allow the bridging of gaps in telemetry coverage of up to ten days. The total mass of the instrument is 1360 g and its power consumption 820 mW. Sampling parameter name : TIME Sampling parameter resolution : 8.0 Sampling parameter interval : 4.0 Sampling parameter unit : SECOND Data set parameter name : MAGNETIC_FIELD_VECTOR Noise level : 0.063 Data set parameter unit : NANOTESLA
Instrument MAG
Temporal Coverage 1986-03-12T00:00:06Z/1986-03-14T02:59:58Z
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-MAG-4-RDR-8SEC-HALLEY, V1.0. https://doi.org/10.5270/esa-2c1d9js