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dc.contributor.authorHernández Pajares, Manuel
dc.contributor.authorGarcía Fernández, Miquel
dc.contributor.authorRius Carrasco, Antoni
dc.contributor.authorNotarpietro, Riccardo
dc.contributor.authorvon Engeln, Axel
dc.contributor.authorOlivares Pulido, Germán
dc.contributor.authorAragón Ángel, Maria Angeles
dc.contributor.authorGarcía Rigo, Alberto
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Matemàtiques
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament d'Enginyeria Química
dc.identifier.citationHernandez, M., García-Fernández, M., Rius, A., Notarpietro, R., von Engeln, A., Olivares-Pulido, G., Aragon-Angel, M.A., Garcia-Rigo, A. Electron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions. "Journal of geophysical research: space physics", Agost 2017, vol. 122, núm. 8, p. 9003-9014.
dc.description.abstractThe 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 hmF2. 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%.
dc.format.extent12 p.
dc.subjectÀrees temàtiques de la UPC::Matemàtiques i estadística::Matemàtica aplicada a les ciències
dc.subjectÀrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica
dc.subject.otherGlobal Positioning System
dc.subject.otherIonospheric sounding
dc.titleElectron density extrapolation above F2 peak by the linear Vary-Chap model supporting new Global Navigation Satellite Systems-LEO occultation missions
dc.contributor.groupUniversitat Politècnica de Catalunya. IonSAT - Grup de determinació Ionosfèrica i navegació per SAtèl·lit i sistemes Terrestres
dc.contributor.groupUniversitat Politècnica de Catalunya. GIR - GIR Ambiental
dc.description.peerreviewedPeer Reviewed
dc.subject.amsClassificació AMS::86 Geophysics
dc.subject.amsClassificació AMS::85 Astronomy and astrophysics
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
local.citation.authorHernandez, M.; García-Fernández, M.; Rius, A.; Notarpietro, R.; von Engeln, A.; Olivares-Pulido, G.; Aragon-Angel, M.A.; Garcia-Rigo, A.
local.citation.publicationNameJournal of geophysical research: space physics

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