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Frequency-Switched Radiometers for Atmospheric Studies at Onsala Space Observatory

Explore the use of frequency-switched radiometers in aeronomy research, analyzing atmospheric components like H2O and CO at specific GHz ranges. Learn about pressure broadening, cold load estimation, and synthetic spectral calibration techniques.

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Frequency-Switched Radiometers for Atmospheric Studies at Onsala Space Observatory

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  1. Radio Aeronomy at Onsala Space Observatory Peter Forkman forkman@oso.chalmers.se

  2. Infrared OH-airglow instrument

  3. Pressure broadening Sky switched H2O at 22 GHz Frequency switched CO at 115 GHz

  4. CO at 115.27 GHz

  5. CO receiver

  6. H2O at 22.2 GHz

  7. Tcold can be estimated assuming constant Trec

  8. Sky as cold load

  9. Teff is estimated from radiosonde data Traditionally Teff = 0.95Tground

  10. H2O at 22.2 GHz

  11. 21/31.4 GHz radiometer

  12. Syntetic spectra 18-34 GHz

  13. Stand alone calibration using skydip method

  14. Optical depth from skydip and dual channel radiometer

  15. Elevation and tropospheric opacity change at 22 GHz

  16. Radio Aeronomy at Onsala Space Observatory Peter Forkman forkman@oso.chalmers.se

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