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Disk-Integrated Polarization of the Moon in the Ultraviolet from SOLSTICE. M. Snow, G. Holsclaw, W. McClintock, T. Woods University of Colorado/LASP [email protected] Outline. SOLSTICE Instrument Lunar observing campaign Observing geometry Polarization observations.

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disk integrated polarization of the moon in the ultraviolet from solstice

Disk-Integrated Polarization of the Moon in the Ultraviolet from SOLSTICE

M. Snow, G. Holsclaw,

W. McClintock, T. Woods

University of Colorado/LASP

[email protected]

outline
Outline
  • SOLSTICE Instrument
  • Lunar observing campaign
  • Observing geometry
  • Polarization observations
solar stellar irradiance comparison experiment solstice
SOLarSTellar Irradiance Comparison Experiment (SOLSTICE)
  • Measures irradiance in ultraviolet
    • 115-180 nm Far Ultraviolet (FUV)
    • 180-300 nm Middle Ultraviolet (MUV)
  • Measures stellar irradiance for tracking long term degradation.
  • On board SORCE:
    • Low Earth Orbit

SOLSTICE Lunar Irradiance

solar stellar ratio
Solar-Stellar Ratio

Need a large dynamic

range to measure both sun and stars with same optics and detectors

SOLSTICE Lunar Irradiance

solstice layout
SOLSTICE Layout
  • Change entrance aperture 2x10^4
  • Widen exit slit 10 or 20
  • Lengthen integration 10^3

SOLSTICE Lunar Irradiance

lunar observing campaign
Lunar Observing Campaign
  • June 2006 to December 2010
  • Added the Moon to the schedule of eclipse calibration activities
  • On average, we observed one disk-integrated spectrum per day in each channel
  • NASA Grant: LASP Lunar Albedo Measurement and Analysis from SOLSTICE (LLAMAS)

SOLSTICE Lunar Irradiance

overview of observations

(MESSENGER)

SSBUV

ROLO

GOME

SOLSTICE

(Galileo)

(SNOE)

(Cassini)

(HUT)

(Apollo 17)

(Mariner 10)

NOZOMI

Overview of Observations
lunar irradiance spectra
Lunar Irradiance Spectra

Phase angle 2 degrees

phase angle
Phase Angle

SOLSTICE Lunar Irradiance

uv disk integrated albedo
UV Disk-integrated Albedo

Phase angle 10 degrees

instrument sensitivity to polarization
Instrument Sensitivity to Polarization

Measured at SURF before launch for both channels.

Very little sensitivity to polarization in FUV channel.

calculating polarization fraction
Calculating Polarization Fraction

Using Mueller Matrices, we can express the measured signal in terms of the spacecraft roll angle, θ

= A + B cos 2

The polarization of the lunar irradiance is then given by:

extracting p m
Extracting Pm

For each wavelength and phase angle, we can find A and B using least-squares fitting algorithm.

summary
Summary
  • SOLSTICE has observed the disk integrated albedo of the Moon from
    • -170 to 170 degrees phase
    • 130-300 nm
  • Instrument is sensitive to polarization above 250 nm
  • Reasonable signal-to-noise measurement of polarization from -90 to 90 degrees phase
  • Consistent with WUPPE measurements and trends from visible region of the spectrum
  • Analysis of systematic errors in data processing continues!
acknowledgements references
Acknowledgements &References

This work was supported by NASA grant NNX09AQ60G (LLAMAS) and NASA contract NAS5-97045 (SORCE) at the University of Colorado.

Snow, M., Holsclaw, G., McClintock, W. E., and Woods T. N. (2012) Absolute ultraviolet irradiance of the Moon from the LASP Lunar Albedo Measurement and Analysis from SOLSTICE (LLAMAS) project. In: Cross-calibration of Past and Present Far UV Spectra of Solar System Objects and the Heliosphere, E. Quemerais, M. Snow, and R. M. Bonnet (eds), ISSI Scientific Report No. 12 (in press)

Snow, M., Holsclaw, G., McClintock W. E., and Woods, T. N. (2007) Absolute ultraviolet irradiance of the Moon from SORCE SOLSTICE. Proc. SPIE 6677:66770D

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