PLASTIC On-board Moments Calculation and Beacon Data
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PLASTIC
PLASTIC On-board Moments Calculation and Beacon Data
Lynn M. Kistler
Space Science Center
UNH
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PLASTIC
€
n = f (θ,φ,v)v 2∫∫∫ cosθdθdϕdv
Moments
The on-board moments calculation is based on that done for CLUSTER/CODIF, and for PLASTIC/IMPACT/SWEA.They are simple sums (not fits) over the available data.
Density is given by:
Where is the polar (deflector) angle and is the azimuthal (position) angle.
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PLASTICDensity Calculation
We can pull out the constants in the sums, to get
€
n =1
taccG
Δvsv 2∑ cosθΔθ s Δϕ sN(θ,ϕ∑∑ ,v)
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n =Δθ sΔϕ s (Δv v)s
taccG
1
vv∑ cosθ N(θ,ϕ ,v)
ϕ∑
θ∑
So what is actually performed on-board is:
€
Sum1=1
vv∑ cosθ N(θ,ϕ ,v)
ϕ∑
θ∑
With the constants added later on the ground.
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PLASTICDensity Calculation
• These sums are implemented using an array of counts of ions classified as H+ that fall in the solar wind sector. This arrays is passed to the moments routine for each ESA step and added to the sums.
• Two separate sets of moments are accumulated: one for S-channel and one for non-S-Channel
• The velocity and trigonometric functions are stored in tables for each of the 32 Position bins, 32 deflection steps, and 128 ESA steps.
• Because of processing limitations, the whole 32Px32D array is not sent used. Instead, a 16P x 8D array is sent.
• The D bins are centered on the peak. The 16P’s cover the full 45 degrees, using every other bin.
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PLASTICHigher Order Moments
The other moments (velocity, temperature, heat flux) are performed in a similar manner, using the appropriate velocity and and trigonometric functions.
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PLASTIC
PLASTIC SSD-side Priority RatesFeb 11-12, 2007
Spacecraft A Spacecraft B
SWH+
SWHe++
SWHeavies
SWOther
WAPH+, He++
WAPOther
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PLASTIC
SC/A deflection
SC/B deflection
SC/A Energy spec
SC/B Energy spec
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PLASTICOn-board moments
Positiondirection
Deflectiondirection
Sunwarddirection
A - blackB - blue
n
vx
vy
vz
Txx
Tyy
Tzz
Feb 11 Feb 12
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PLASTICS/C B - 10 days March 15-24
SWH+
SWHe++
SWHeavies
SWOther
WAPH+, He++
WAPOther
S/C B still not observing standard solar wind
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PLASTICS/C B - 2 days March 15-16
SWH+
S/C B still not observing standard solar wind
Def
lect
ion
(pol
ar)
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PLASTICIssues
• Final Calibrations are not yet incorporated - density is currently off by ~x2
• S/C B is still in sheath, so densities low.
• Still validating the ecliptic angle.
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PLASTICOn-board moments
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PLASTICOn-board moments
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PLASTICExample of Beacon data on SSC web site
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PLASTICThe End