Seminar Physik und Chemie der Atmosphäre (Abstract)
Impact of Refraction on Solar Occultation Measurements
Michael Lutomsky
Institut für Umweltphysik
milutom@iup.physik.uni-bremen.de
8.2.2002, 13.00 c.t.
Raum N3380
SCIAMACHY (Scanning Imaging Absorption Spectrometer for Atmospheric Chartography) has got three
observational measurement modes: Nadir, Limb mode and the occultation mode. This presentation will focus on the occultation geometry.
The principle is to look from the satellite through the atmosphere in the rising sun. The way of the ray through
the atmosphere is approximately 2500 km. Therefore a small refraction angle has a significant influence on
the measurement. It will be shown that the refraction angle depends on the season and on the wavelength of the light. Additionally, some consequences for data evaluation will be discussed.