Text of Ganymede Lander Page 1 - Magnetometer Proposal -Moscow, 2013-03-06 Magnetic Field Measurement...
Ganymede Lander Page 1 - Magnetometer Proposal -Moscow, 2013-03-06 Magnetic Field Measurement Onboard a Ganymede Lander Experiment Proposal Based on Experiences with Lander Magnetometers for the Missions Mars 96/98, Rosetta and Hayabusa-2 Uli Auster & Karl Heinz Glameier for the JUICE J-MAG Team (TU-BS Germany, IWF Austria and IC UK) Magnetism of Ganymede Environmental Conditions on Ganymede Magnetic field measurement on a Lander Summary
Ganymede Lander Page 2 - Magnetometer Proposal -Moscow, 2013-03-06 Magnetic Field at Ganymede Scientific ObjectiveExpected Signal Intrinsic dynamo field1400nT at poles Jovian magnetospheric field at Ganymedes orbital distance+/-100nT Ganymeds magnetospheric and plasma interaction signal+/- 180nT Induced signal at 500km altitude, ocean38nT @ T= 10,5hours 0.7nT @ T= 171hours 0.6nT @ T= 27days Induced signal core (w/o ocean)3.2nT @ T= 10,5hours Courtesy of Jia and Kivelson
Ganymede Lander Page 3 - Magnetometer Proposal -Moscow, 2013-03-06 Lander Contribution to investigate intrinsic fields Decay of field during descent Courtesy Ben Weiss
Ganymede Lander Page 4 - Magnetometer Proposal -Moscow, 2013-03-06 Lander Contribution to investigate induced fields Induced Signal in dependency on source region @ JUICE Orbit @ Ganymede surface -100km -200km -500km -1000km Ocean at
Ganymede Lander Page 5 - Magnetometer Proposal -Moscow, 2013-03-06 Condition at Ganymed Environmental Conditions on Ganymed: Cold and high Radiations Recent work for JUICE might solve some problems. Temperature: Test facilities have been refurbished for tests and calibration in a wide temperature range Radiation: Tolerant electronics is needed, Hybrids (ITAR free) for AD and DA conversion have been developed
Ganymede Lander Page 6 - Magnetometer Proposal -Moscow, 2013-03-06 Test Facilities Magnetsrode near BraunschweigIWF Graz Graz: zero levels, noise density and transfer function at temperature range of +/-150C Magnetsrode: scale values, linearity and orthogonality from -190C to +180C
Ganymede Lander Page 7 - Magnetometer Proposal -Moscow, 2013-03-06 Radiation tolerant electronics Radiation tolerant Hybrids (ITAR free) for AD and DA conversion AD-ConverterDA Converter AD converter with preamplifier and latch up protection Two cascaded DA converter with sum-up and current source option Resolution18bit, 1MHzResolution16 bit each Power consumption40mW + 25mWPower consumption60mW Input Noise:2nV/Sqrt(Hz)Non Linearity: