NDLI: A self-contained GIM-aided Abel retrieval method to improve GNSS-Radio Occultation retrieved electron density profiles

Content Provider	Springer Nature Link
Author	Tulasi Ram, S. Su, Shin Yi Tsai, Lung Chi Liu, Chao Han
Copyright Year	2015
Abstract	A self-contained global ionospheric maps (GIM)-aided Abel retrieval method is adopted that can account for spherical non-uniformity along the radio wave path in the vicinity of the radio occultation (RO) region using the asymmetry factors derived from global background N m F 2 maps. This procedure does not require any supplementary data sources to augment the Abel retrieval in order to represent the horizontal gradients in the ionosphere. This simulation study demonstrates that when sufficiently dense RO observations are available, the N m F 2 values initially derived from classical Abel retrieval (with the assumption of spherical symmetry) are sufficiently good and useful to represent the spherical non-uniformities in electron density distribution. The Ne(h) profiles retrieved from this Abel retrieval procedure aided with asymmetry factors provide significant improvement compared to classical Abel retrieval at both F- and E-regions. The artificial large-scale structures, such as wave number-3 latitudinal structure and plasma caves underneath the equatorial ionization anomaly crests, were largely eliminated. This improved retrieval procedure also reduces the computational complexity and is suitable when the number of occultations increased by many times in the future when FORMOSAT-7/COSMIC-2 (F7/C2) and other RO missions become operational. The computation simplicity in this self-contained GIM-aided Abel retrieval procedure enables more accurate retrieval of Ne(h) profiles in near real time.
Starting Page	825
Ending Page	836
Page Count	12
File Format	PDF
ISSN	10805370
Journal	GPS Solutions
Volume Number	20
Issue Number	4
e-ISSN	15211886
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-10-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	GNSS-Radio Occultation Ionosphere Electron density profiles Abel retrieval Geophysics/Geodesy Atmospheric Sciences Extraterrestrial Physics, Space Sciences Automotive Engineering Electrical Engineering
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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