BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE.

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BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements IR measurements on ISS Ground-based IR measurements Comparisons with ATLAS 3, SIM and Sciamachy New IR measurements?

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements IR measurements on ISS Ground-based IR measurements Comparisons with ATLAS 3, SIM and Sciamachy New IR measurements?

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements July 2008  first determination of the IR SSI using IR1, IR2 & IR3 and : With Deg(λ,t) = 1 & F(x,y) = 1 or ≠ 1 Comparisons with SIM and ATLAS 3  discrepancies

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements Origin of the discrepancies?  instrumental … but no satisfying explanations were found Note: Spectral region with weak SSI variations Importance for the climatology The solar NIR radiation plays a role on the Earth radiative budget due to the wavelength dependent atmospheric absorption (H20, C02) and the absorption by the upper layer of ocean water, confirming the importance of IR on ocean circulation Paucity of space measurements  importance to solve instrumental problems First:  Check of the stability of the IR channel of SOLAR/SOLSPEC during the SOLAR mission.  Study of fine correction of the IR signal  IR ground-based measurements

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements IR channel responsivity  increase (~10 %) during the SOLAR mission W3 (spare lamp) Using the tungsten lamps as relative standard W4 (common lamp) Using the SSI as relative standard

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements Tungsten lamps  possible change of emission? I & V (W3 lamp)  Could not explain the observed 10 % change Laboratory test  change of effective Ribbon temperature versus ΔI

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements IR channel responsivity  absolute level to be considered Case 1 Case 2 IR responsivity PTB Launch PTB Launch 10 % increase after the launch 2 years of stabilization Criteria provided by the internal lamps  Case 1 should be validated

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC – IR channel  AD conversion Improved data processing - Fine corrections to be developed IR VDC signal  negative offset     Transition through zero

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC – IR channel  AD conversion Voltage Code 2i2i V real < V i Schematic of IR3 versus IR2 for one reading (102 µs) Simulation from a mathematical model

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC – IR channel  AD conversion Example of fine corrections IR electronic (SOLAR/SOLSPEC) – IR3 versus IR2  transition associated to 2e14 Real behavior reproduced by modelling (adjustment of 0.8 % of the AD converter, for 2e14)

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements IR measurements on ISS Ground-based IR measurements Comparisons with ATLAS 3, SIM and Sciamachy New IR measurements?

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A Comparison between space NIR SSI measurements + IRESPERAD (blue dots)  Brightness temperature ~350 K below ATLAS3  Ground-based validation campaign (IRESPERAD) to provide new measurements of Top Of Atmosphere (TOA) Solar Spectral Irradiance (SSI) in the NIR Importance of NIR SSI  Absorption by the atmosphere (CO 2, H 2 O, O 3, O 2 ) & upper layer of the oceans  role in the Earth’s radiative budget Challenge for the measurements (Bouguer-Langley method )  Instrumentation – calibration – site of measurements SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A IRSPERAD 600 – 2300 nm 10 nm bandwidth PbS detector Phase sensitive detection Entrance optic:  tube designed for SSI measurements (concentric pinholes & frosted quartz) FOV 7.2° Bentham Double monochromator IRSPERAD campaign – The instrumentation Absolute calibration:  using the same blackbody than for SOLSPEC, at the same distance SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A  = Solar zenith angle  = optical depth AMF (m) between 2 and 8  Bouguer-Langley method using WTLS algorithm  TOA SSI at 1 UA  Atmospheric windows (164 channels) Method: Kindel et al., Appl. Opt, 2001, pp  ground-based SSI Selected wavelengths IRSPERAD campaign – The methodology SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A 1-June 18:30 Results presented here: from first two weeks (June 2011)  optimal weather conditions and strong control of all scales (radiometric, ) Data selection  clear sky, free of visible clouds  free of any tin (invisible) cirrus clouds (LIDAR monitoring)  low Aerosol Optical Depth (AOD), AERONET data & low variability  Bouguer-Langley plots: coefficient of regression > 0.99 IRSPERAD – The campaign SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A Langley plots:  66 available events for the whole campaign  one third for the first two weeks = 1070 nm R² = = 870 nm R² = = 1640 nm R² = Gaussian fit for the 164 channels:  example for = 1070 nm IRSPERAD – The campaign SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A Standard uncertainties  calculated using the Law of Propagation of Uncertainties (LPU) for 11 relevant wavelengths S Iz  electronic output signal obtained for a given solar measurement C  stability of scale Denominator  thermal correction (if required) for the detector response  response curve Corr  response change (relative units) IRSPERAD campaign – Results & uncertainties SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements IR measurements on ISS Ground-based IR measurements Comparisons with ATLAS 3, SIM and Sciamachy New IR measurements?

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A 1) SOLSPEC ATLAS3  SOSP version of SOLSPEC (EURECA 1992 – 1993) 2) Arvesen  airborne set data at 12 km of altitude (1969) 3) SIM on SORCE  prism spectrometer (2003 – ) A SIM-to-ATLAS3 deviation was found and corrected because:  the calculated uncertainties reached 8 % for SIM above 1.35 μm  the need to achieve both a more plausible TSI and solar brightness temperature values (around 1.6 μm) as ATLAS3 did IRSPERAD campaign – Discussion & comparisons Harder, J.W., Thuillier, G., Richard, E.C., Brown, S.W., Lykke, K.R., Snow, M., McClintock,W.E., Fontenla, J.M., Woods, T.N., Pilewskie, P.: 2010, The SORCE SIM solar spectrum: Comparison with recent observations. Solar Phys. 263, 3 – 24. SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 ATLAS3 – SIM – Sciamachy comparisons  published data from Sciamachy Pagaran, J., Harder, J. W., Weber, M., Floyd, L. E. and Burrows, J. P., Intercomparison of SCIAMACHY and SIM vis-IR irradiance over several solar rotational timescales, A & A, 528, id.A67, / / , / /20 Noel at al,. 2007

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A 4) SCHIAMACHY  remote-sensing spectrometer with NIR channels (2002 – 2012) Absolute calibrated Estimated standard uncertainty: 2 % 5) IRSPERAD IRSPERAD campaign – Discussion & comparisons SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A 7) CAVIAR ESS  high-resolution Fourier Spectrometer (2008)  Composite results: All sets of data are independent (hardware, methodology, calibration) Except: 1) IRSPERAD – SOLAR/SOLSPEC (blackbody) 2) CAVIAR ESS – IRSPERAD (Bouguer-Langley) IRSPERAD campaign – Discussion & comparisons 6) SOLAR/SOLSPEC  SOLAR mission on ISS (2008 – ---) Renewed NIR channel, absolute calibrated at the PTB (blackbody) Estimated standard uncertainty: lower than 2 % for most of the NIR range SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A TSI estimation: (1357,1  ~15) W/m² SOLAR/SOLSPEC workshop 2015

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 Discussions concerning the NIR solar spectrum Comparisons between SOLAR/SOLSPEC, ATLAS 3, SIM and Sciamachy Question 1  What about the performances of the blackbody from Heidelberg and the PTB as primary standards (stability & determination of the temperature of the cavity) PTB blackbody (used for SOLAR/SOLSPEC and IRESPERAD)  drift < 0.5 K/hour, u(T) = 0.4 K (0.15 % in term of SI) Blackbody from Heidelberg (used for SOLSPEC ATLAS & SOSP)  u(T) = 4 K

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 Harder, J. W., Thuillier, G., Richard, E. C., Brown, S. W., Lykke, K. R., Snow, M. McClintock, W. E., Fontenla, J. M., Woods, T. N. and Pilewskie, P., The SORCE SIM Solar Spectrum: Comparison with Recent Observations, Solar Physics, 263, 3-24, 2010, doi: /s y. Question 2  What about the corrections of the water vapor absorption during the absolute calibration of SOLSPEC (ATLAS 3) Detection for SIM & SOLAR/SOLSPEC

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 Thuillier, G. et al., The Solar Spectral Irradiance from 200 to 2400 nm as Measured by the SOLSPEC Spectrometer from the ATLAS and EURECA Missions, Solar Physics, 214, 1-22, 2003 For the SOSP absolute calibration, it is stated in the ATLAS 3 paper: ‘(g) From the air transmission: During the blackbody calibration, the instrument is flushed with dry nitrogen. However, the optical path length of 85 cm between the blackbody and the entrance diffuser is in air. But, this distance is too short to give a noticeable absorption in the IR range except around 1.35 μ m and 1.9 μ m where it could reach 0.1% due to H 2 O absorption bands.’  With 85 cm of optical path, water vapor absorption can reach up to 10 % (around 1,85 µm). It seems to be missing in the uncertainty budget of the ATLAS 3 spectrum.

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 SOLAR/SOLSPEC  IR measurements IR measurements on ISS Ground-based IR measurements Comparisons with ATLAS 3, SIM and Sciamachy New IR measurements? Before new SIM on ISS:  IRSPERAD instrument on airplane? (to reproduce the Arvesen measurements)  Balloon flight using filters radiometer (NIR)?  Nanosatellite with filters radiometer (NIR)?

BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’AERONOMIE SPATIALE DE BELGIQUE BELGIAN INSTITUTE FOR SPACE AERONOMY BELGISCH INSTITUUT VOOR RUIMTE-AERONOMIE INSTITUT D’A SOLAR/SOLSPEC workshop 2015 Conclusions For IRSPERAD: success for the instrumentation and interpretation of the results. Discussions about the NIR atmospheric windows. For SOLAR/SOLSPEC: improvements for the operations of the IR channel (for the first time, measurements above 2,4 µm, …). Fine corrections of the electronics to be solved. Discrepancies between ATLAS 3 and other spectra still under discussions.