One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. Validation
Abstract Culverwell et al. (2023, https://doi.org/10.1029/2023SW003572) described a new one‐dimensional variational (1D‐Var) retrieval approach for ionospheric GNSS radio occultation (GNSS‐RO) measurements. The approach maps a one‐dimensional ionospheric electron density profile, modeled with multip...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2024-01-01
|
| Series: | Space Weather |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2023SW003571 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841536505352290304 |
|---|---|
| author | S. Elvidge S. B. Healy I. D. Culverwell |
| author_facet | S. Elvidge S. B. Healy I. D. Culverwell |
| author_sort | S. Elvidge |
| collection | DOAJ |
| description | Abstract Culverwell et al. (2023, https://doi.org/10.1029/2023SW003572) described a new one‐dimensional variational (1D‐Var) retrieval approach for ionospheric GNSS radio occultation (GNSS‐RO) measurements. The approach maps a one‐dimensional ionospheric electron density profile, modeled with multiple “Vary‐Chap” layers, to bending angle space. This paper improves the computational performance of the 1D‐Var retrieval using an improved background model and validates the approach by comparing with the COSMIC‐2 profile retrievals, based on an Abel Transform inversion, and co‐located (within 200 km) ionosonde observations using all suitable data from 2020. A three or four layer Vary‐Chap in the 1D‐Var retrieval shows improved performance compared to COSMIC‐2 retrievals in terms of percentage error for the F2 peak parameters (NmF2 and hmF2). Furthermore, skill in retrieval (compared to COSMIC‐2 profiles) throughout the bottomside (∼90–300 km) has been demonstrated. With a single Vary‐Chap layer the performance is similar, but this improves by approximately 40% when using four‐layers. |
| format | Article |
| id | doaj-art-99fd8a68bb154ab385ce51873eb9e90c |
| institution | Kabale University |
| issn | 1542-7390 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Space Weather |
| spelling | doaj-art-99fd8a68bb154ab385ce51873eb9e90c2025-01-14T16:26:56ZengWileySpace Weather1542-73902024-01-01221n/an/a10.1029/2023SW003571One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. ValidationS. Elvidge0S. B. Healy1I. D. Culverwell2Space Environment and Radio Engineering (SERENE) University of Birmingham Birmingham UKEuropean Centre for Medium‐Range Weather Forecasts Reading UKMet Office Exeter UKAbstract Culverwell et al. (2023, https://doi.org/10.1029/2023SW003572) described a new one‐dimensional variational (1D‐Var) retrieval approach for ionospheric GNSS radio occultation (GNSS‐RO) measurements. The approach maps a one‐dimensional ionospheric electron density profile, modeled with multiple “Vary‐Chap” layers, to bending angle space. This paper improves the computational performance of the 1D‐Var retrieval using an improved background model and validates the approach by comparing with the COSMIC‐2 profile retrievals, based on an Abel Transform inversion, and co‐located (within 200 km) ionosonde observations using all suitable data from 2020. A three or four layer Vary‐Chap in the 1D‐Var retrieval shows improved performance compared to COSMIC‐2 retrievals in terms of percentage error for the F2 peak parameters (NmF2 and hmF2). Furthermore, skill in retrieval (compared to COSMIC‐2 profiles) throughout the bottomside (∼90–300 km) has been demonstrated. With a single Vary‐Chap layer the performance is similar, but this improves by approximately 40% when using four‐layers.https://doi.org/10.1029/2023SW003571ionosphereradio occultationbending angle |
| spellingShingle | S. Elvidge S. B. Healy I. D. Culverwell One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. Validation Space Weather ionosphere radio occultation bending angle |
| title | One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. Validation |
| title_full | One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. Validation |
| title_fullStr | One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. Validation |
| title_full_unstemmed | One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. Validation |
| title_short | One‐Dimensional Variational Ionospheric Retrieval Using Radio Occultation Bending Angles: 2. Validation |
| title_sort | one dimensional variational ionospheric retrieval using radio occultation bending angles 2 validation |
| topic | ionosphere radio occultation bending angle |
| url | https://doi.org/10.1029/2023SW003571 |
| work_keys_str_mv | AT selvidge onedimensionalvariationalionosphericretrievalusingradiooccultationbendingangles2validation AT sbhealy onedimensionalvariationalionosphericretrievalusingradiooccultationbendingangles2validation AT idculverwell onedimensionalvariationalionosphericretrievalusingradiooccultationbendingangles2validation |