General consideration on KuaFu-B ( 夸父 B)

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-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.”


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


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


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


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)


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.


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)


Example 2: Cluster & DSPExample 2: Cluster & DSP

• Two sensors+DPU• 290g(sensor)+48g (therm

al cover)• Electronic box 2.06kg• Normal power 2.46W


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.


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)


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


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


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.


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


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


Preliminary DesignPreliminary Design

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


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


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



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


谢谢

Thanks

Dank

Merci

Documents

General consideration on KuaFu-B ( 夸父 B)