Solar Spectral Flux Radiometer (SSFR)

ATTREXScience Team Meeting

Oct. 23, 2013

NASA ARC/University of Colorado

Zeiss Monolithic Spectrometer

VIS-NIR: 256 element silicon diode array 260-1090 nm, 3.0 nm sampling, 8 nm FWHM

NIR: 256 element InGaAs array 903-2217 nm, 5.0 nm sampling, 16 nm FWHM

16-bit systemNIST traceable calibrationIntegrating sphere for cosine response

Kipp and Zonen CG4 pyrgeometer

• Wavelength range: 4.5-42 μm• Simultaneous zenith and nadir viewing• Hemispheric FOV• Sampling rate: 1 Hz• Measured quantities: Upwelling and downwelling broadband infrared irradiance [W m-2]

Solar Spectral Flux Radiometer (SSFR)

Since the ATTREX mission inearly 2013 SSFR successfully participated in the 2013 SEAC4RS mission • 20 DC-8 science flights• Instrument returned in good

shape• Post-mission calibration to be

performed soon

Solar Spectral Flux Radiometer (SSFR)

For the 2014 ATTREX mission

Pre-mission • Perform SSFR system functional check (mid to late Oct.)• Calibrate SSFR (angular, absolute, wavelength) (late Oct.

to mid Nov.)• Integrate/test on Global Hawk

Solar Spectral Flux Radiometer (SSFR)

Since the ATTREX mission inearly 2013 requests been made to modify SSFR light collector and CG4 mounting to nadir fairing• Currently major undertaking to

remove/install fairing to access light collector and CG4 especially for field calibration

• Reduce risk to AWAS inlet and line mounted to same fairing

Fairing removed for SSFR cal