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Electron Spectrometer. On Swarm. On the Advantage of a Particle Experiment. B is integrated property: sum of contributions from all electric currents j in the Earth’s core, ionosphere, but also on the spacecraft ...

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Electron Spectrometer


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    1. Electron Spectrometer On Swarm 28.04.2005 | 9th MAG meeting, ESTEC, June 22-23, 2005 | page 1

    2. On the Advantage of a Particle Experiment • B is integrated property: sum of contributions from all electric currents jin the Earth’s core, ionosphere, but also on the spacecraft ... • In-situ measurement of electric field E with EFI, and of localcurrent density j with curl-B technique • These currents have only minor directeffect on estimation of core and crustal fieldsince they are (mathematically) orthogonal to a potential field • But they have a significant indirect impact, since they feed ionospheric currents, J(ionospheric currents are internal for Swarm, and may therefore disturb internal field models) • Missing link: ionospheric conductivity Sproduced by electron precipitation (at polar latitudes) Particle experiment provides information on ionospheric conductivity S 28.04.2005 | 9th MAG meeting, ESTEC, June 22-23, 2005 | page 2

    3. Concept Electron Spectrometer 28.04.2005 | 9th MAG meeting, ESTEC, June 22-23, 2005 | page 3

    4. Block Diagram 28.04.2005 | 9th MAG meeting, ESTEC, June 22-23, 2005 | page 4

    5. Resource Requirements and Specifications • Mass 1 kg • Power 3 w • Size 0.1 x 0.2 x 0.1 m • Field-of-view 210º x 10º, 16 Sectors • 64 Energy Levels • Energy Range 10 eV – 30 keV • Energy Resolution ΔE/E = <8% • Field-of-view in orbit plane (B-field plane) • Data Rate 2 kb/sec compressed 90% • Purge required • Cost Estimate 2 M€ for STM-EM-3 FM-QM/FS • Consortia DNSC – IRF - RIT 28.04.2005 | 9th MAG meeting, ESTEC, June 22-23, 2005 | page 5