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The 'geodynamo' in the Earth's liquid outer core produces a magnetic field that dominates the large and medium length scales of the magnetic field observed at the Earth's surface. Here we use data from the currently operating Danish Oersted satellite, and from the US Magsat satellite that operated in 1979/80, to identify and interpret variations in the(More)
Swarm, a satellite constellation to measure Earth's magnetic field with unpreceded accuracy, has been selected by ESA for launch in 2009. The mission will provide the best ever survey of the geomagnetic field and its temporal evolution, in order to gain new insights into the Earth system by improving our understanding of the Earth's interior and climate. An(More)
We show that distinct changes in scaling parameters of the D st index time series occur as an intense magnetic storm approaches, revealing a gradual reduction in complexity. The remarkable acceleration of energy release – manifested in the increase in susceptibility – couples to the transition from anti-persistent (negative feedback) to persistent (positive(More)
We report here a simple but practical method to combine systematically the magnetic surveys of disparate specifications from marine, ground, aeromagnetic and satellite platforms that aims to be helpful in the framework of the world digital magnetic anomaly map project. Because the satellite coverage and data quality is more uniform than near-surface(More)
2 Figure 1: Location of lunar landing sites and the ALSEP stations. Instruments deployed at multiple sites are linked. INTRODUCTION This white paper focuses on the scientific rationale for deploying a global, long-lived network of geophysical instruments on the surface of the Moon to understand the nature and evolution of the lunar interior from the crust(More)
Introduction The geomagnetic field of the Earth varies on timescales ranging from seconds to millions of years. Variations on short timescales are mostly dominated by external sources, while variations on longer timescales (~ 1 year and longer) are collectively known as secular variation (SV) and are predominantly of internal origin. It is also known that(More)
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