urn:nasa:pds:context:instrument:vega2.mischa 1.0 1.11.0.0 Product_Context urn:nasa:pds:context:instrument:mischa.vega2 2021-02-24 1.0 Changed inst LIDs from u:n:p:c:i:instID.scID to u:n:p:c:i:scID.instID And per "Guide toPDS4 Context Products" v1.7, changed all lidvid_reference to lid_reference urn:nasa:pds:context:instrument_host:spacecraft.vega2 instrument_to_instrument_host Reinhard, R and B. Battrick (eds), 'Space Missions to Halley's Comet', European Space Agency ESA SP-1066, ESA Pub Div, Moordwijk, Netherlands, 1986. reference.ESA-SP1066 FLUXGATE MAGNETOMETER Magnetometer not applicable not applicable Scientific Overview =================== The magnetometer (MISCHA) The prime objective of the magnetometer experiment is to determine the role of the magnetic field in the interaction between the solar wind and the comet and to identify the characteristic boundaries of the cometary environment (bow shock, contact surface, etc.). Instrument Overview =================== The sensors of the MISCHA magnetometer are mounted on a boom. A single-axis sensor and a triaxial sensor are mounted 1 and 2 m, respectively, from the edge of the solar panel. The advantage of this dual-sensor fluxgate system is the possibility to determine the spacecraft's stray magnetic field. Magnetometer characteristics ---------------------------- Dynamic range +/- 100 nT Resolution 0.05 nT (12 bit) Noise level 0.01 nT Hz**-1/2 Zero drift +/- nT/month Bandwidth 10 Hz Time resolution 10 vector/s (high-speed telemetry) 1 spectrum/25 s Number of frequency points 128/spectrum Detectors --------- MASS: triaxial sensor ... 500 g one-axis sensor ... 200 g electronic box ... 2200 g Operational Consdierations -------------------------- MODE TRASSA 1 TRASSA 1 (memory mode) this is the cruise phase mode; 1 vector/2.5 min and 1 averaged spectrum/80 min MODE TRASSA 2 TRASSA 2 (memory mode) 2 days until 2 hours before Halley encounter and during selected cruise phase intervals (e.g. Venus tail crossing and ICE Giacobini-Zinner encounter); 1 vector/min and 1 averaged spectrum/5 min MODE HIGH SPEED HIGH SPEED (memory mode) 10 vector/min and 1 averaged spectrum/30 sec MODE Direct Transmission DT-65 (direct transmission) 2 hours before until 2 hours after Halley encounter 10 vectors/sec and 1 spectrum/25 sec