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General consideration on KuaFu-B ( 夸父 B)

夸父计划. General consideration on KuaFu-B ( 夸父 B). Jing-Song Wang School of Earth and Space Sciences Peking University. KuaFu Meeting Dec. 9, 2004 Frankfurt. KuaFu-B and Ravens. 东汉王充在 《 论衡 · 说日 》 中说：“日中有三足乌。” WANG Chong (27~97AD) in his book Lun Heng: on the Sun :

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General consideration on KuaFu-B ( 夸父 B)

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  1. 夸父计划 General consideration on KuaFu-B (夸父B) Jing-Song Wang School of Earth and Space Sciences Peking University KuaFu Meeting Dec. 9, 2004 Frankfurt

  2. KuaFu-B and Ravens 东汉王充在《论衡·说日》中说：“日中有三足乌。” WANG Chong (27~97AD) in his book Lun Heng: on the Sun: “There is a raven with three feet in the Sun.”

  3. General Information • Scientific Objectives • Imaging aurora activities 24hrs per day • RAVENS Concept • With the highest priority • Providing in-situ space environment measurements : magnetosphere-thermosphere-ionosphere • Monitoring the satellite inside radiation environment in conjunction with outside one • KuaFu B1+B2 • Polar orbit: 1.1x8.2Re

  4. Payload • FUV Aurora Camera(s) [Eric] • Aurora Imaging Spectrograph [Eric] • Flux Gate Magnetometer • High Energy Charged Particle Experiment • Energetic Energy Particle Detector (TBD) • Neutral Atom Imager • Plasma Wave Observation (TBD) • Radio Beacon

  5. Summary

  6. FGM (Graz) • Scientific Objectives • Providing accurate, high time-resolution measurements of the magnetic field vector in the magnetosphere • Understanding the basic processes that occur in the magnetosphere • Investigating complex and dynamic magnetospheric processes in different regions and boundaries (In conjunction with other plasma observations)

  7. Instrument description • The magnetometer consists of two triaxial fluxgate sensors with associated sensor electronics, digital processing unit and DC/DC converter. • one of the magnetometer sensors (the outboard, or OB sensor) is located at the end of one of the two radial booms of the spacecraft, the other (the inboard, or IB sensor) is located inboard from the end of the boom.

  8. Example1: Polar

  9. Example 2: Cluster & DSP • Two sensors+DPU • 290g(sensor)+48g (thermal cover) • Electronic box 2.06kg • Normal power 2.46W

  10. Example 3: Venus Express Cluster FGM 67 Hz data studied the turbulence. Equator-S 150 Hz FGM data studies the 'lion roar' waves.

  11. Requirements to the Satellite • Magnetic Cleanliness A comprehensive magnetic cleanliness program was implemented, to ensure that any disturbance caused by the spacecraft is minimized • The sensors are mounted on a 5 m boom, which locates them at about 4.6 m and 6.1 m from the centre-line of the spacecraft, or at 3.1 m and 4.6 m from the surface of the spacecraft, respectively (Cluster) • The maximum allowable DC magnetic field at the location of the outboard magnetometer sensor is 0.25 nT; the field should not vary by more than 0.1 nT in 100 s. Strict magnetic cleanliness requirements were enforced, with all elements of the spacecraft allocated a maximum magnetic budget. • Potential problem • Radiation belt (lessons from DSP)

  12. HECPE (PKU) • Scientific Objectives • Detecting the charged particles with energy high enough to penetrate the satellite surface and affect the inside facilities • Monitoring the particle environment around the satellite • Investigating the variations of the radiation belt

  13. Instrument Description • 3 channels for electron: • E>0.5 MeV • E>1.0 MeV • E>2.0 MeV • 4 channels for proton: • 5 ~ 10MeV • 10 ~ 20 MeV • 20~40 MeV • 20~80 MeV Radiation Belt

  14. Preliminary Design • CSP: Charge-Sensitive Pre-amplifier; • MA: Main Amplifier; • DCC: Discrimination and Compounding Circuit; • CA: Counter Array; • DPU: Data Process Unit; • IF: Interface; • ODBH: On-Board Data Handling.

  15. Key Parameters • Power: 4.0W • Mass: 3.0Kg • Dimension: 160x140x220mm^3 • Field of View: 60degree • Data rate: 500bps • Sample rate: ~5s • Spin platform Example: CBERS-1

  16. EEPD (TBD, PKU?) • Scientific Objectives • Analyzing the suprathermal plasma distribution in wide energy range • Providing important clues on the nature of the energization process • Tracing out plasma structures over distances as large as an Earth radius • Determining the field topology of the tail-like field configurations

  17. Preliminary Design • 20–400 keV for electrons • 40 keV–1500 keV for hydrogen • 10 keV/nucl–1500 keV (4000 keV) for heavier ions

  18. An example • RAPID onboard Cluster • The head • Flightpaths (mean) 34 mm • Field-of-view (total) 6°× 60° • Polar angles 4 × 15° • E-Detector (ED):Area/Thickness 5 × 15 mm2/300 µ • B-Detector (BD):Area/Thickness 5 × 15 mm2/300 µ • START foil:  Al/Lexan/Al 63 nm/ 83 nm /63 nm • Deflection voltage 0 - 10 kV 

  19. NAI (DSP?) • Scientific Objectives • Magnetospheric Structure and Ring Current Dynamics • Global context for in situ observations of magnetospheric processes and the response of the magnetosphere to solar wind drivers • Ring current growth, decay, and azimuthal asymmetries • Substorms and Tail Dynamics • Substorm-related energetic particle injection and acceleration • Plasma sheet thinning/expansion and Substorm onset timing and location

  20. Examples

  21. 谢谢 Thanks Dank Merci

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