urn:esa:psa:context:instrument:ro.giada 1.0 1.11.0.0 Product_Context urn:nasa:pds:context:instrument:giada.ro 2021-02-24 1.0 Changed inst LIDs from u:n:p:c:i:instID.scID to u:n:p:c:i:scID.instID Changed LIDs from urn:nasa:pds: to urn:esa:psa: And per "Guide toPDS4 Context Products" v1.7, changed all lidvid_reference to lid_reference urn:esa:psa:context:instrument_host:spacecraft.ro instrument_to_instrument_host Bussoletti E. et al., The GIADA experiment for Rosetta mission to comet 46P/Wirtanen: design and performances, Adv. Space Res., 24, 1139, 1999. reference.BUSSOLETTIETAL1999 Colangeli, L. et al., The Grain Impact Analyser and Dust Accumulator (GIADA) experiment for the Rosetta mission: design, performances and first results, Space Sci. Rev., 128(1-4), p.803-821, Feb 2007. reference.COLANGELIETAL2007 Esposito F. et al., Physical aspect of an 'Impact sensor' for the detection of Cometary dust Momentum onboard the Rosetta Space Mission, Adv. Space Res., 29, 8, 1159-1163, 2002. reference.ESPOSITOETAL2002 Mazzotta Epifani E. et al., The Grain Detection System for the GIADA instrument: design and expected performances, Adv. Space Res., 29, 8, 1165, 2002. reference.MAZZOTTAEPIFETAL2002 Palomba, E., et al., The sticking efficiency of quartz crystals for cosmic sub-micron grain collection, Planet. Space Sci., 49, 919, 2001. reference.PALOMBAETAL2001 Palomba, E., et al., Performance of Micro-Balances for dust flux measurement, Adv. Space Res., 29, 1155-1158, 2002. reference.PALOMBAETAL2002 GRAIN IMPACT ANALYSER AND DUST ACCUMULATOR Dust not applicable not applicable Instrument Overview =================== The Grain Impact Analyser and Dust Accumulator (GIADA) is the instrument on-board the ROSETTA Orbiter that has been designed to study the dust environment of comet 67P/Churyumov-Gerasimenko. Thanks to the rendezvous configuration of the mission, GIADA will be plunged into the dust environment of the coma and will explore the dust flux evolution and grain dynamics vs. position and time. This is a unique opportunity to perform measurements on key parameters that no ground-based observation or fly-by mission are able to obtain and that no tail or coma model elaborated so far have been able to properly simulate. The coma and nucleus properties shall be, then, clarified with consequent improvement of models describing both inner and outer coma evolution and dust and gas emission from the nucleus during different evolution phases. GIADA shall measure mass/size of single particles larger than about 15 micron, together with momentum in the range 6.5 x 10^(-10) - 4.0 x 10^(-4) kg m s^(-1) and for velocities up to about 300 m s^(-1). The cumulative mass shall be detected, with sensitivity 10^(-10) g, for micron/submicron particles. These performances shall provide a statistically relevant set of data about dust physical and dynamic properties in the environment of comet 67P/Churyumov-Gerasimenko. GIADA is based on three different sensing methods. A Grain Detection System (GDS) shall detect optically the transit of each single grain entering GIADA, without affecting its dynamic properties; an Impact Sensor (IS) shall monitor, by piezoelectric sensors (PZTs), the momentum released by the same grain upon impact onto an aluminium plate. Independently, five Micro Balance Systems (MBSs), pointing towards different space directions, will measure the cumulative deposition in time of fine dust. A more complete description of the GIADA instrument is in RO_GIA_OACUPA_IF_011_I3 (reported in DOCUMENT dir). Other additional information are given in the following papers (as cited in REF.CAT): [BUSSOLETTIETAL1999] and [COLANGELIETAL2007] for what concerns the overall GIADA instrument description, [ESPOSITOETAL2002] for what concerns working principle and tests on IS, [MAZZOTTAEPIFETAL2002] for what concerns working principle and tests on GDS, [PALOMBAETAL2001] and [PALOMBAETAL2002] for what concerns the performances and working principle of Microbalances.