The Radio Occultation Meteorology Satellite Application Facility (ROM SAF) is a decentralised processing centre under EUMETSAT which is responsible for operational processing of GRAS radio occultation (RO) data from the Metop satellites and also reprocesses RO data from other missions. The ROM SAF delivers bending angle, refractivity, temperature, pressure, humidity, and other geophysical variables in near real-time (for NWP users) and in offline (for research use), as well as reprocessed Climate Data Records (CDRs) and Interim Climate Data Records (ICDRs) for users requiring a higher degree of homogeneity of the RO data sets. The CDRs and ICDRs (and also the offline data) are further processed into globally gridded monthly-mean data for use in climate monitoring and climate science applications.

The ROM SAF also maintains the Radio Occultation Processing Package (ROPP) which contains software modules that aid users wishing to process, quality-control and assimilate radio occultation data from any radio occultation mission into NWP and other models.

ROM SAF Product Archive
For access to the data products, please use the Product Archive

NRT Monitoring of RO Data
ROM SAF monitoring and data flow
ECMWF ROM SAF monitoring statistics


Release of the software deliverable GBGP, Version 1.0
The Ground-Based GNSS Processing (GBGP) package contains format converters and tools for BUFR encoding of ground-based GNSS observations. Read more here.
[June 11, 2019]

Release of Interim Climate Data Record radio occultation products from Metop
The release contains the Interim CDR radio occultation (RO) data generated from the Metop satellite mission. Read more here.
[May 24, 2019]

We are pleased to announce the next ROM SAF User Workshop to be held as a joint workshop together with IROWG as follows: Konventum, Helsingør (Elsinore), Denmark, 19 - 25 September 2019. Read more here.
[May 20, 2019]

KOMPSAT-5/AOPOD data included in the NRT monitoring pages
Operational AOPOD radio occultation data from the KOMPSAT-5 satellite have been added to the NRT monitoring system. Read more here.
[May 14, 2019]

Publication of ROM SAF Report 31
This report contains brief notes on the bending angles and slantwise total electron contents that result from the use of a single, spherically symmetric ‘VaryChap’ ionosphere. Read more here.
[May 7, 2019]

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