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KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
General consideration on General consideration on KuaFu-B (KuaFu-B ( 夸父夸父 B)B)
KuaFu Meeting Dec. 9, 2004 Frankfurt
Jing-Song Wang
School of Earth and Space Sciences
Peking University
夸父计划
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
KuaFu-B and RavensKuaFu-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.”
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
General InformationGeneral 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
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
PayloadPayload
• 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
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
SummarySummary
Instrument Mass (kg)Power (W)
Data Rate (bps)
Dimension (cm^3)
FUV Camera 2x(?)2.8 2x(?)2<1M
2x(?)40x20x20
AIS 20.2 4.4 80x50x30
FGM 3 <4.25 3k 6.7x6.7x4.2
HECPE 3 4 500 16x14x22
EEPD 5.6 4.5 5k 35x20x21
NAI 4 4 5k 36x15x15
Radio Beacon TBD 1 TBD TBD
PWO TBD
Total ~40 <30 ~1M
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
FGM (Graz)FGM (Graz)
• Scientific Objectives– Providing accurate, high time-resolution measurem
ents 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)
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Instrument descriptionInstrument 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.
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Example1: PolarExample1: Polar
Sensors Mass-Inboard 686 gMass-Outboard 620 gDimensions 9.5 cm diameter, 15.5 cm lengthPower 0.05 W (sensors)
Electronics Mass 3.86 gVolume 18.3 X 24.1 X 15.2 cm3Power-normal 4.3 W
Range Inboard Magnetometer 46700 or 5860 nT (plus and minus)Outboard Magnetometer 5525 or 694 nT (plus and minus)
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Example 2: Cluster & DSPExample 2: Cluster & DSP
• Two sensors+DPU• 290g(sensor)+48g (therm
al cover)• Electronic box 2.06kg• Normal power 2.46W
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Example 3: Venus ExpressExample 3: Venus Express
Range TBD
Resolution 10 pT
Data rate 128 Hz (TBD)
Power Max 4.25 W
Electronic box 1kg
sensors 2x75g
Dimension of box 155x142x99mm^3
Dimension of sensor
67x67x42mm^3
Cluster FGM 67 Hz data studied the turbulence.
Equator-S 150 Hz FGM data studies the 'lion roar' waves.
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Requirements to the SatelliteRequirements to the Satellite
• Magnetic CleanlinessA 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)
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
HECPE (PKU)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
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Instrument DescriptionInstrument 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
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Preliminary DesignPreliminary 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 Ha
ndling.
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Key ParametersKey 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
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
EEPD (TBD, PKU?)EEPD (TBD, PKU?)
• Scientific Objectives– Analyzing the suprathermal plasma distribution in
wide energy range – Providing important clues on the nature of the ener
gization process– Tracing out plasma structures over distances as lar
ge as an Earth radius– Determining the field topology of the tail-like field
configurations
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
Preliminary DesignPreliminary Design
•20–400 keV for electrons•40 keV–1500 keV for hydrogen•10 keV/nucl–1500 keV (4000 keV) for heavier ions
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
An exampleAn 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
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
NAI (DSP?)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 acceleratio
n • Plasma sheet thinning/expansion and Substorm onset timing
and location
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
ExamplesExamples
InstrumentMass (kg)
Power (W)
Data Rate
(kbps)
Dimension (cm^3)
FOV
(deg)Heritage
LENA 4.3 2.0 1.0 36 x 15 x 15 8x90 Polar
MENA 3.3 3.0 1.0 36 x 15 x 15 6x90 Polar
HENA 4.5 4.0 2.5 30 x 10 x 30 30x90 AMPTE
NAI 3.13 4.0 4.9 28.7x14.2x11.1 DSP
KuaFu Meeting Dec. 9, 2004 Frankfurt/Main夸父计划夸父计划
谢谢
Thanks
Dank
Merci