NRT Notification Detail
| Publication of ROM SAF Report 43 on ROPP ionospheric 1D-Var retrieval applied to Metop extension data |
| DATE: 2023-09-19 12:02 TYPE: ROPP |
| Description |
| Dear ROM SAF ROPP User Issued: 2023-09-19 11:57 UTC We are pleased to announce the publication of Report 43 describing the application of ROPP ionospheric 1D-Var retrieval to Metop extension data: ROM SAF Report 43: Applying the ROPP ionospheric 1D-Var retrieval to Metop extension data (https://rom-saf.eumetsat.int/general-documents/rsr/rsr_43.pdf) Abstract A one-dimensional variational (1D-Var) retrieval approach for ionospheric GNSS radio occultation (GNSS-RO) measurements is now included in version 11 of the Radio Occultation Processing Package (ROPP-11: see https://rom-saf.eumetsat.int/ropp/). This 1D-Var code is applied to Metop extension data, where the bending angles extend up to 600 km. It is shown that the 1D-Var code can process the Metop data, but around 15 % of the retrievals either converge to a high cost at convergence value, or fail to converge in 50 iterations. Various problematic cases are presented. Missing bending angles and inconsistent bending angles at the L1 and L2 frequencies can cause retrieval problems. In some cases, the retrieval produces ionospheric layers peaking well below 100 km. A number of additional quality control (QC) checks are suggested. It is found that single frequency retrievals can be performed with simple source code changes. Kind regards The ROM SAF Team |
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