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Extracting Ocean-Generated Tidal Magnetic Signals from Swarm Data Through Satellite GradiometryOcean-generated magnetic field models of the Principal Lunar, M2, and the Larger Lunar elliptic, N2, semidiurnal tidal constituents were estimated through a "Comprehensive Inversion" of the first 20.5 months of magnetic measurements from European Space Agency's (ESA) Swarm satellite constellation mission. While the constellation provides important north-south along-track gradiometry information, it is the unique low-spacecraft pair that allows for east-west cross-track gradiometry. This latter type is crucial in delivering an M2 estimate of similar quality with that derived from over 10 years of CHAMP satellite data but over a shorter interval, at higher altitude, and during more magnetically disturbed conditions. Recovered N2 contains nonoceanic signal but is highly correlated with theoretical models in regions of maximum oceanic amplitude. Thus, satellite magnetic gradiometry may eventually enable the monitoring of ocean electrodynamic properties at temporal resolutions of 1 to 2 years, which may have important implications for the inference of ocean temperature and salinity.
Document ID
20160005805
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)
Tyler, Robert H.
(Maryland Univ. College Park, MD, United States)
Olsen, Nils
(Technical Univ. of Denmark Lyngby, Denmark)
Date Acquired
May 4, 2016
Publication Date
April 14, 2016
Publication Information
Publication: Geophysical Research Letters
Publisher: AGU Publications
Volume: 43
Issue: 7
Subject Category
Oceanography
Report/Patent Number
GSFC-E-DAA-TN31547
Funding Number(s)
CONTRACT_GRANT: NNG06EO90A
Distribution Limits
Public
Copyright
Other
Keywords
Magnetic
SWARM
CHAMP

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