Verifying short-wave in-flight calibration of the ScaRaB/meteor radiation budget scanner

Frederic Raison; Robert S. Kandel

doi:10.1117/12.228958

Abstract

The French-Russian-German 4-channel ScaRaB (Scanner for Radiation Budget) instrument operated on board the Russian Meteor-3/7 satellite from February 1994 to March 1995. Earth Radiation Budget (ERB) detenninations depend on the two broad-band channels -an unfiltered total (TW) channel sensitive from 0.2 to at least 50 gm, and a short-wave (SW) channel in which a fused silica filter cuts off sensitivity at about 4 jim. In-flight SW calibration depends on lamp sources which may drift or fluctuate. Because daytime LW determinations depend on a weighted subtraction of SW from LW measurements, SW calibration errors will affect the results and can induce a spurious diurnal cycle in the LW. The relative SW sensitivity of the TW and SW channels can be checked, independently of on-board SW lamp sources, by using the ScaRaB JR window (IRW : 1O.5-12.5jim) channel and insisting on diurnal/nocturnal LW consistency. Both the IRW channel and the LW portion of the TW channel are calibrated by reliable on-board black bodies. Results for the first several months of ScaRaB operation are presented, considering also the difficulties arising from the thermal radiation in the near-IR portion of the SW channel. These results are compared with those obtained using the on-board lamp sources. They show that these two methods are complementary: iamps allow accurate monitoring of short-term gain fluctuations while the geophysical method ensures reliability oflamp calibration over the monthly time scale.

Citation Download Citation

Frederic Raison, Robert S. Kandel, "Verifying short-wave in-flight calibration of the ScaRaB/meteor radiation budget scanner", Proc. SPIE 2578, Passive Infrared Remote Sensing of Clouds and the Atmosphere III, (27 December 1995); doi: 10.1117/12.228958; https://doi.org/10.1117/12.228958

ACCESS THE FULL ARTICLE

PERSONAL SIGN IN
Full access may be available with your subscription

Email or Username Forgot your username?

Password Forgot your password?

Show

Remember Email/Username on this computer

Remember Password

No SPIE account? Create an account
or Institutional Sign In via Shibboleth

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $14.40

Non-members: $18.00 ADD TO CART

Show All Keywords

Keywords/Phrases

Search In:

Publication Years