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NRT Notification Detail
| Ionospheric 1D-Var papers |
| DATE: 2024-02-01 12:38 TYPE: ROPP |
| Description |
| Dear ROM SAF ROPP User Issued: 2024-02-01 12:36 UTC The ROM SAF has recently had two papers on ionospheric electron density retrieval published in Space Weather: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023SW003572 https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2023SW003571 These papers outline and then test a novel approach for retrieving electron density profile information from GNSS-RO measurements using the one-dimensional variational retrieval (1D-Var) technique. The ionospheric 1D-Var approach was primarily developed to accommodate the truncated GNSS-RO measurement geometry of EPS-SG, but it can be applied to other missions. The testing published in Space Weather suggests that the 1D-Var performance is comparable to the Abel transform method used in the processing of COSMIC-2 GNSS-RO measurements. A key innovation is the use of bending angles above 100 km in the 1D-Var code, because this circumvents the need for differential code biases (DCBs). More generally, the use of bending angles may have implications for how GNSS-RO measurements are assimilated in ionospheric data assimilation systems, but this hypothesis needs to be tested in future work. An F90 version of the ionospheric 1D-Var code is available in version 11 of ROM SAF’s Radio Occultation Processing Package (ROPP-11) and further updates are anticipated in ROPP-12 which is due to be released in Q4, 2024 (see https://rom-saf.eumetsat.int/ropp/). Kind regards The ROM SAF Team |
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