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Particles and Fields Package (PFP) SWEA pre-CDR Peer Review Science 2011 March 28 PowerPoint PPT Presentation


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Particles and Fields Package (PFP) SWEA pre-CDR Peer Review Science 2011 March 28. Dave Mitchell. MAVEN Level 1 Requirements. SWEA Science Goals. Magnetic Topology & Plasma Regime Crustal Magnetospheres/Cusps Draped Field Lines. o. o. o. SWEA Science Goals. MGS MAG/ER.

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Particles and Fields Package (PFP) SWEA pre-CDR Peer Review Science 2011 March 28

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Particles and fields package pfp swea pre cdr peer review science 2011 march 28

Particles and Fields Package (PFP)

SWEA pre-CDR Peer Review

Science

2011 March 28

Dave Mitchell


Maven level 1 requirements

MAVEN Level 1 Requirements


Swea science goals

SWEA Science Goals

  • Magnetic Topology & Plasma Regime

  • Crustal Magnetospheres/Cusps

  • Draped Field Lines

o

o

o


Swea science goals1

SWEA Science Goals

MGS MAG/ER

  • Electron Impact Ionization

  • Magnetic Pileup Region

  • Ionosphere


Particles and fields package pfp swea pre cdr peer review science 2011 march 28

SWEA Science Goals

Mars Express

Shadow

2.35 RM

Photo-ionization of CO2by solar h @ 304 Å

ESCAPE

PEB

h-electrons

MPB

5

4

3

R (MSO)

2

1

0

Escape associated with heavy ions (M> 16)

-3

-2

-1

0

1

2

X (MSO)


Pf level 3 requirements

PF Level 3 Requirements


In flight calibration

In-Flight Calibration

  • Pre-launch: SWEA must have the right dynamic range to handle expected flux range at Mars (10 years of experience with MGS ER)

    • Need to know GF to a factor of ~2: pre-launch calibrations and simulations easily provide this

  • Primary Method: LPW measures plasma frequency in the sheath to determine absolute plasma density – compare with SWEA, SWIA, STATIC

  • Secondary Method: STATIC MCP efficiencies can be determined in flight by comparing START and STOP events – combine with well known mechanical geometric factor to determine absolute sensitivity – cross calibrate with SWEA in sheath

  • Cross Check: STATIC cross calibrated with NGIMS by measuring periapsis RAM ions – cross calibrate with SWEA in sheath


Data products

Data Products

FPGA provides a single science data product to the PFDPU

Counts per accumulation interval for each of the 16 anodes (as a function of analyzer and deflector sweeps)

Complete measurement sequence takes 2 seconds.

PFDPU computes three data products, with cadence depending on altitude


Spacecraft accomodation

Spacecraft Accomodation

  • Boom location:

  • Separation from s/c potentials

  • Large, clear field of view

  • Sensor head in shadow

  • Electronics box in sunlight

FOV:

360o x ±65o

SWEA axis parallel to SC Z when deployed


Variation of energy resolution

of the sensor at low energy can be controlled by varying the voltage bias U0 between the internal and external grids:

where is the energy resolution for zero bias (0.175)

and is the incident energy of the electron

Thus for 1.5x finer energy resolution (and 2x smaller GF), we apply

Variation of Energy Resolution

/

Works for apoapsis and side segments in all orbit scenarios. Works for Sun-Velocity mode at periapsis (~50% of orbits).

Does not work for deep dips.


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