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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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10.1002/2017JA023876
 
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Hernández Pajares, ManuelMés informacióMés informacióMés informació
García Fernández, MiquelMés informacióMés informació
Rius Carrasco, AntoniMés informació
Notarpietro, Riccardo
von Engeln, Axel
Olivares Pulido, GermánMés informacióMés informació
Aragón Ángel, Maria Angeles
García Rigo, AlbertoMés informació
Document typeArticle
Defense date2017-08
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
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 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%.
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. 
URIhttp://hdl.handle.net/2117/114686
DOI10.1002/2017JA023876
ISSN2169-9380
Publisher versionhttp://onlinelibrary.wiley.com/doi/10.1002/2017JA023876/pdf
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  • Departament de Matemàtiques - Articles de revista [3.473]
  • IonSAT - Grup de determinació Ionosfèrica i navegació per SAtèl·lit i sistemes Terrestres - Articles de revista [89]
  • Departament d'Enginyeria Química - Articles de revista [2.444]
  • GIR - Grup de recerca: GIR Ambiental - Articles de revista [26]
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