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Use of the occultation measurement principle for observing the Earth's atmosphere and climate has become so broad as to exploit solar, lunar, stellar, navigation and satellite-crosslink signals, to employ the whole electromagnetic spectrum from EUV/UV via VIS/IR to MW and radio, and to utilize all kinds of atmosphere-radiation interaction such as refraction, absorption, and scattering.

Occultation methods share the unique properties of self-calibration, high accuracy and vertical resolution, global coverage, and, if using radio signals, all-weather capability. They thus bear great utility for meteorology and climate science, and other fields. The many different uses and variants of the occultation method have led to a diversification of the occultation-related scientific community into several sub-communities, however.

OPAC-IROWG 2022 sets in at this point and aims at providing a casual forum and stimulating atmosphere fertilizing scientific discourse, co-operation initiatives, and mutual learning & support amongst members of all the different sub-communities.

Topical areas include:

  • Occultation methodology (generic aspects, math-phys basis, iono. influences)
  • Use of occultation data in atmospheric physics
  • Use of occultation data in NWP
  • Use of occultation data in climate monitoring and research
  • Specific occultation methods and related techniques (LEO, stellar, solar/lunar, reflectometry)
  • Occultations in ionosphere and planetary science
  • Future occultation missions

OPAC Chairs
U. Foelsche, A.K. Steiner, G. Kirchengast (WEGC & IGAM Uni Graz, AT)

IROWG Co-Chairs
S. Healy (ECMWF, UK), H. Shao (NOAA and UCAR, USA)

IROWG-CGMS Rapporteur
A.J. Mannucci (JPL Pasadena, USA)


Lena Zechner

Wegener Center for Climate and Global Change
Telefon:+43 (0)316 380 - 8429

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