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CM5, a Pre-Swarm Comprehensive Geomagnetic Field Model Derived from Over 12 Yr of CHAMP, Orsted, SAC-C and Observatory DataA comprehensive magnetic field model named CM5 has been derived from CHAMP, Ørsted and SAC-C satellite and observatory hourly-means data from 2000 August to 2013 January using the Swarm Level-2 Comprehensive Inversion (CI) algorithm. Swarm is a recently launched constellation of three satellites to map the Earth's magnetic field. The CI technique includes several interesting features such as the bias mitigation scheme known as Selective Infinite Variance Weighting (SIVW), a new treatment for attitude error in satellite vector measurements, and the inclusion of 3-D conductivity for ionospheric induction. SIVW has allowed for a much improved lithospheric field recovery over CM4 by exploiting CHAMP along-track difference data yielding resolution levels up to spherical harmonic degree 107, and has allowed for the successful extraction of the oceanic M2 tidal magnetic field from quiet, nightside data. The 3-D induction now captures anomalous Solar-quiet features in coastal observatory daily records. CM5 provides a satisfactory, continuous description of the major magnetic fields in the near-Earth region over this time span, and its lithospheric, ionospheric and oceanic M2 tidal constituents may be used as validation tools for future Swarm Level-2 products coming from the CI algorithm and other dedicated product algorithms.
Document ID
20160008412
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sabaka, Terence J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Olsen, Nils
(Technical Univ. of Denmark Lyngby, Denmark)
Tyler, Robert H.
(Maryland Univ. College Park, MD, United States)
Kuvshinov, Alexey
(Eidgenoessische Technische Hochschule Zurich, Switzerland)
Date Acquired
July 1, 2016
Publication Date
August 13, 2014
Publication Information
Publication: Geophysical Journal International
Publisher: Wiley Online Library
Volume: 200
Issue: 3
Subject Category
Geosciences (General)
Report/Patent Number
GSFC-E-DAA-TN20960
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Other
Keywords
modelling and interpretation
Geomagnetic induction
Magnetic anomalies

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