Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX
Equatorial ionosphere poses a challenge to any algorithm that is used for tomographic reconstruction because of the phenomena like the Equatorial Ionization Anomaly (EIA) and Equatorial Spread F (ESF). Any tomographic reconstruction of ionospheric density distributions in the equatorial region i...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2004-11-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/22/3445/2004/angeo-22-3445-2004.pdf |
| _version_ | 1818540646823100416 |
|---|---|
| author | S. V. Thampi T. K. Pant S. Ravindran C. V. Devasia R. Sridharan |
| author_facet | S. V. Thampi T. K. Pant S. Ravindran C. V. Devasia R. Sridharan |
| author_sort | S. V. Thampi |
| collection | DOAJ |
| description | Equatorial ionosphere poses a challenge to any algorithm that is used for
tomographic reconstruction because of the phenomena like the Equatorial
Ionization Anomaly (EIA) and Equatorial Spread F (ESF). Any tomographic
reconstruction of ionospheric density distributions in the equatorial region
is not acceptable if it does not image these phenomena, which exhibit large
spatial and temporal variability, to a reasonable accuracy. The accuracy of
the reconstructed image generally depends on many factors, such as the
satellite-receiver configuration, the ray path modelling, grid intersections
and finally, the reconstruction algorithm. The present simulation study is
performed to examine these in the context of the operational Coherent Radio
Beacon Experiment (CRABEX) network just commenced in India. The feasibility
of using this network for the studies of the equatorial and low-latitude
ionosphere over Indian longitudes has been investigated through simulations.
The electron density distributions that are characteristic of EIA and ESF
are fed into various simulations and the reconstructed tomograms are
investigated in terms of their reproducing capabilities. It is seen that,
with the present receiver chain existing from 8.5° N to 34° N, it
would be possible to obtain accurate images of EIA and the plasma bubbles. The
Singular Value Decomposition (SVD) algorithm has been used for the inversion
procedure in this study. As is known, by the very nature of ionospheric
tomography experiments, the received data contain various kinds of errors,
like the measurement and discretization errors. The sensitivity of the
inversion algorithm, SVD in the present case, to these errors has also been
investigated and quantified. |
| first_indexed | 2024-12-11T21:58:07Z |
| format | Article |
| id | doaj.art-266aaa6e324f43a28ab075ab2480760f |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-11T21:58:07Z |
| publishDate | 2004-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-266aaa6e324f43a28ab075ab2480760f2022-12-22T00:49:14ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762004-11-01223445346010.5194/angeo-22-3445-2004Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEXS. V. Thampi0T. K. Pant1S. Ravindran2C. V. Devasia3R. Sridharan4Space Physics Laboratory, Vikram Sarabhai Space Centre Trivandrum, 6 95 022, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre Trivandrum, 6 95 022, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre Trivandrum, 6 95 022, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre Trivandrum, 6 95 022, IndiaSpace Physics Laboratory, Vikram Sarabhai Space Centre Trivandrum, 6 95 022, IndiaEquatorial ionosphere poses a challenge to any algorithm that is used for tomographic reconstruction because of the phenomena like the Equatorial Ionization Anomaly (EIA) and Equatorial Spread F (ESF). Any tomographic reconstruction of ionospheric density distributions in the equatorial region is not acceptable if it does not image these phenomena, which exhibit large spatial and temporal variability, to a reasonable accuracy. The accuracy of the reconstructed image generally depends on many factors, such as the satellite-receiver configuration, the ray path modelling, grid intersections and finally, the reconstruction algorithm. The present simulation study is performed to examine these in the context of the operational Coherent Radio Beacon Experiment (CRABEX) network just commenced in India. The feasibility of using this network for the studies of the equatorial and low-latitude ionosphere over Indian longitudes has been investigated through simulations. The electron density distributions that are characteristic of EIA and ESF are fed into various simulations and the reconstructed tomograms are investigated in terms of their reproducing capabilities. It is seen that, with the present receiver chain existing from 8.5° N to 34° N, it would be possible to obtain accurate images of EIA and the plasma bubbles. The Singular Value Decomposition (SVD) algorithm has been used for the inversion procedure in this study. As is known, by the very nature of ionospheric tomography experiments, the received data contain various kinds of errors, like the measurement and discretization errors. The sensitivity of the inversion algorithm, SVD in the present case, to these errors has also been investigated and quantified.https://www.ann-geophys.net/22/3445/2004/angeo-22-3445-2004.pdf |
| spellingShingle | S. V. Thampi T. K. Pant S. Ravindran C. V. Devasia R. Sridharan Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX Annales Geophysicae |
| title | Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX |
| title_full | Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX |
| title_fullStr | Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX |
| title_full_unstemmed | Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX |
| title_short | Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX |
| title_sort | simulation studies on the tomographic reconstruction of the equatorial and low latitude ionosphere in the context of the indian tomography experiment crabex |
| url | https://www.ann-geophys.net/22/3445/2004/angeo-22-3445-2004.pdf |
| work_keys_str_mv | AT svthampi simulationstudiesonthetomographicreconstructionoftheequatorialandlowlatitudeionosphereinthecontextoftheindiantomographyexperimentcrabex AT tkpant simulationstudiesonthetomographicreconstructionoftheequatorialandlowlatitudeionosphereinthecontextoftheindiantomographyexperimentcrabex AT sravindran simulationstudiesonthetomographicreconstructionoftheequatorialandlowlatitudeionosphereinthecontextoftheindiantomographyexperimentcrabex AT cvdevasia simulationstudiesonthetomographicreconstructionoftheequatorialandlowlatitudeionosphereinthecontextoftheindiantomographyexperimentcrabex AT rsridharan simulationstudiesonthetomographicreconstructionoftheequatorialandlowlatitudeionosphereinthecontextoftheindiantomographyexperimentcrabex |