Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions.
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| Title: | Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions. |
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| Authors: | Hernández-Pajares, Manuel1, Garcia-Fernàndez, Miquel1,2, Rius, Antonio3, Notarpietro, Riccardo4, Engeln, Axel4, Olivares-Pulido, Germán1,5, Aragón-Àngel, Àngela6, García-Rigo, Alberto1 |
| Source: | Journal of Geophysical Research. Space Physics. Aug2017, Vol. 122 Issue 8, p9003-9014. 12p. |
| Abstract: | The new radio-occultation (RO) instrument on board the future EUMETSAT Polar System-Second Generation (EPS-SG) satellites, flying at a height of 820 km, is primarily focusing on neutral atmospheric profiling. It will also provide an opportunity for RO ionospheric sounding, but only below impact heights of 500 km, in order to guarantee a full data gathering of the neutral part. This will leave a gap of 320 km, which impedes the application of the direct inversion techniques to retrieve the electron density profile. To overcome this challenge, we have looked for new ways (accurate and simple) of extrapolating the electron density (also applicable to other low-Earth orbiting, LEO, missions like CHAMP): a new Vary-Chap Extrapolation Technique (VCET). VCET is based on the scale height behavior, linearly dependent on the altitude above h m F2. This allows extrapolating the electron density profile for impact heights above its peak height (this is the case for EPS-SG), up to the satellite orbital height. VCET has been assessed with more than 3700 complete electron density profiles obtained in four representative scenarios of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) in the United States and the Formosa Satellite Mission 3 (FORMOSAT-3) in Taiwan, in solar maximum and minimum conditions, and geomagnetically disturbed conditions, by applying an updated Improved Abel Transform Inversion technique to dual-frequency GPS measurements. It is shown that VCET performs much better than other classical Chapman models, with 60% of occultations showing relative extrapolation errors below 20%, in contrast with conventional Chapman model extrapolation approaches with 10% or less of the profiles with relative error below 20%. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Items | – Name: Title Label: Title Group: Ti Data: Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hernández-Pajares%2C+Manuel%22">Hernández-Pajares, Manuel</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Garcia-Fernàndez%2C+Miquel%22">Garcia-Fernàndez, Miquel</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Rius%2C+Antonio%22">Rius, Antonio</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Notarpietro%2C+Riccardo%22">Notarpietro, Riccardo</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Engeln%2C+Axel%22">Engeln, Axel</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Olivares-Pulido%2C+Germán%22">Olivares-Pulido, Germán</searchLink><relatesTo>1,5</relatesTo><br /><searchLink fieldCode="AR" term="%22Aragón-Àngel%2C+Àngela%22">Aragón-Àngel, Àngela</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22García-Rigo%2C+Alberto%22">García-Rigo, Alberto</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Aug2017, Vol. 122 Issue 8, p9003-9014. 12p. – Name: Abstract Label: Abstract Group: Ab Data: The new radio-occultation (RO) instrument on board the future EUMETSAT Polar System-Second Generation (EPS-SG) satellites, flying at a height of 820 km, is primarily focusing on neutral atmospheric profiling. It will also provide an opportunity for RO ionospheric sounding, but only below impact heights of 500 km, in order to guarantee a full data gathering of the neutral part. This will leave a gap of 320 km, which impedes the application of the direct inversion techniques to retrieve the electron density profile. To overcome this challenge, we have looked for new ways (accurate and simple) of extrapolating the electron density (also applicable to other low-Earth orbiting, LEO, missions like CHAMP): a new Vary-Chap Extrapolation Technique (VCET). VCET is based on the scale height behavior, linearly dependent on the altitude above h m F2. This allows extrapolating the electron density profile for impact heights above its peak height (this is the case for EPS-SG), up to the satellite orbital height. VCET has been assessed with more than 3700 complete electron density profiles obtained in four representative scenarios of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) in the United States and the Formosa Satellite Mission 3 (FORMOSAT-3) in Taiwan, in solar maximum and minimum conditions, and geomagnetically disturbed conditions, by applying an updated Improved Abel Transform Inversion technique to dual-frequency GPS measurements. It is shown that VCET performs much better than other classical Chapman models, with 60% of occultations showing relative extrapolation errors below 20%, in contrast with conventional Chapman model extrapolation approaches with 10% or less of the profiles with relative error below 20%. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/2017JA023876 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 9003 Titles: – TitleFull: Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hernández-Pajares, Manuel – PersonEntity: Name: NameFull: Garcia-Fernàndez, Miquel – PersonEntity: Name: NameFull: Rius, Antonio – PersonEntity: Name: NameFull: Notarpietro, Riccardo – PersonEntity: Name: NameFull: Engeln, Axel – PersonEntity: Name: NameFull: Olivares-Pulido, Germán – PersonEntity: Name: NameFull: Aragón-Àngel, Àngela – PersonEntity: Name: NameFull: García-Rigo, Alberto IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 21699380 Numbering: – Type: volume Value: 122 – Type: issue Value: 8 Titles: – TitleFull: Journal of Geophysical Research. Space Physics Type: main |
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