Ceilometer: Time-Height Cross Sections
Quicklook and Archive

Range Corrected Signal (uncalibrated)
Real Time Image
20.05.2019 @ 04:55 UTC
(updated every 5 minutes)

 Munich: MIM-ceilometer (blueYALIS) @ 1064 nm
 Munich: MIM-ceilometer (redYALIS) @ 903 nm
 Schneefernerhaus: UFS-Ceilometer @ 1064 nm

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Archive: May 2019


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Quicklooks of the „range corrected lidar signal“ at 1064 nm measured by blueYALIS (CHM15kx, Lufft) and at 903 nm from redYALIS (CHM8k, Lufft), both operated by the Meteorological Institute of the Ludwig-Maximilians-Universität (48.148 N, 11.573 E, altitude 539 m). The signals are not overlap-corrected if not otherwise stated. We are grateful that we are allowed to process the corresponding data (since 1. June 2010) of the CHM15k ceilometer located at the UFS (altitute 2712 m, 93 km south of Munich), owned by the UFS and operated by the German Weather Service for comparison. The temporal resolution is 15 s, the vertical resolution is 15 m (raw data). The quicklooks are smoothed over 5 range bins for blueYALIS and the UFS ceilometer until 12.11.2018. All other signals are not smoothed.

Range corrected signal

The range corrected signal is proportional to the attenuated backscatter, and in first approximation proportional to the backscatter coefficient of particles. The backscatter coefficient is an indication for the „amount of aerosols“. The signals at 903 nm (redYALIS) are also influenced by water vapor absorption. The images show clouds in white (very strong backscatter signal) and aerosols in green and yellow (medium strong signal). Extended white and red areas down to the ground indicate rain. Note, that „steps“ in the colored areas (visible until 27. October 2014 for the blueYALIS measurements) are due to automatically changed settings of the ceilometer's detection unit.

History of blueYALIS

History of redYALIS


Examples with explanations are shown here

Further reading

Questions and/or comments?

If yes, please contact Matthias Wiegner