L2EASI

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L2-EASI (Earth Atmosphere
Solar-Occultation Imager)
J. Herman R. Lyon R. Berg
Spectrometer view of the earths atmosphere
EASI
Occultation using Absorption Spectra for CO2,
CH4, H2O, O3, O2, N2O
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Libration Points
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OrbitConfiguration Summary
Figure courtesy of EASI
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OccultationConfiguration Summary
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ObservingConfiguration Summary
Figure courtesy of EASI
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EASI View of the Earth-Sun System Varies on a
Monthly and Semi-annual Cycle
EASI lissajous orbit period about L2 is roughly 6
months Earth-sun L2 point is affected by the Moon
position in its orbit EASI has good coverage of
tropical and most temperate earth atmosphere
North-South movement(extreme position shown)
Perfect centering(happens rarely)
East-West movement(extreme position shown)
Occasional centered orientation
Frequent E-W orientation
Frequent N-S orientation
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Delta IV-4450-14Launch Configuration


.2 m
11.2 m
PAF C.G. limits 4.3 m
Actual C.G. 2.0 m
Separation Plane
1575-5 PAF
Note! This volume could be negotiated for
spacecraft use
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Orbit Configuration


Instrument Payload Assembly (ISAL concept)
Added side Stiffeners Brace (IMDC) to Instrument
Payload Assembly
Fixed 15.22m solar array shown (per side)
Fixed 1.5 Dia. M (hard mounted To Stiffener) Comm
antenna
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SVIP - The Next Step on the Road to Large-Scale
Space Interferometry for Earth Science
Astronomy
Instrument Size
Time
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Prototype Interferometer Design
Collimating Telescopes
Interferometer
Phase Detector
Spectrometer
A schematic design of the L-2 Interferometer The
spacing of the telescopes is purposely
non-uniform to maximize the number of
non-redundant path lengths so that maximum
spatial resolution can be obtained from a
sparsely filled aperture. The diagram shows
SVIPs single science focal plane as the last
element within a grating spectrometer. The
flight model has 5 telescopes.
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QUESTIONS