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Radio Occultation Techniques for Probing the Ionosphere

Jakowski, Norbert and Angling, Matthew and Leitinger, Reinhart (2004) Radio Occultation Techniques for Probing the Ionosphere. Annals of Geophysics, 47 (2), pp. 1049-1066. EDITRICE COMPOSITORI BOLOGNA. ISSN 1593-5213.

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GPS radio occultation measurements establish the basis for a new remote sensing technique for vertical profile information about the electron density of the entire ionosphere from satellite orbit heights down to the bottomside. No other profiling technique such as vertical sounding or incoherent scatter, unifies vertical profiling through the entire ionosphere with global coverage. Inversion methods are described both for vertical profiling as well as for 3D electron density reconstructions of the ionosphere. In three dimensional electron density reconstructions using signals from Global Navigation Satellite Systems (GNSS), the Ionospheric radio occultation (IRO) measurements provide vertical information which is complementary to the information obtained by ground based measurements. Assessment of achievable accuracy and spatial resolution are addressed by simulation studies. IRO measurements have been carried out onboard the German CHAMP satellite since 11 April 2001 on a routine basis. Assuming a spherically layered ionosphere, up to about 150 electron density profiles (EDP’s) per day are retrieved within a latency of 3 hours. Validation results obtained by using independent data sources are reported. The validation with vertical sounding data in mid-latitudes indicates a small positive bias in the plasma frequency of up to about 0.5 MHz throughout the entire profile. Averages of the numerous EDP’s show well-known ionospheric phenomena such as the equatorial anomaly, the winter anomaly and the expansion of the profile with increasing solar energy input. It is concluded that CHAMP-IRO measurements have the potential to establish global data sets of vertical electron density profiles for developing and improving global ionospheric models and to provide operational space weather information.

Item URL in elib:https://elib.dlr.de/21399/
Document Type:Article
Title:Radio Occultation Techniques for Probing the Ionosphere
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Angling, MatthewQinetiQ, Malvern,UKUNSPECIFIED
Leitinger, ReinhartIGAM, Graz, AustriaUNSPECIFIED
Journal or Publication Title:Annals of Geophysics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1049-1066
EditorsEmailEditor's ORCID iD
Keywords:Ionosphere, GPS radio occultation, electron density profiles, 3 D data assimilation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Ionosphärenerkundung (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Communication and Navigation > Navigation > Navigation and Control Systems
Deposited By: Jakowski, Dr.rer.nat. Norbert
Deposited On:06 Apr 2006
Last Modified:27 Apr 2009 04:54

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