Gauge-and-compass migration: inherited magnetic headings and signposts can adapt to changing geomagnetic landscapes [PDF]
Movement Ecology, 2023 Background For many migratory species, inexperienced (naïve) individuals reach remote non-breeding areas independently using one or more inherited compass headings and, potentially, magnetic signposts to gauge where to switch between compass headings ...
James D. McLaren +2 more
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Geomagnetic Virtual Observatories: monitoring geomagnetic secular variation with the Swarm satellites [PDF]
Earth, Planets and Space, 2021 We present geomagnetic main field and secular variation time series, at 300 equal-area distributed locations and at 490 km altitude, derived from magnetic field measurements collected by the three Swarm satellites.
Magnus D. Hammer +4 more
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Geomagnetic secular variation forecast using the NASA GEMS ensemble Kalman filter: A candidate SV model for IGRF-13 [PDF]
Earth, Planets and Space, 2021 We have produced a 5-year mean secular variation (SV) of the geomagnetic field for the period 2020–2025. We use the NASA Geomagnetic Ensemble Modeling System (GEMS), which consists of the NASA Goddard geodynamo model and ensemble Kalman filter (EnKF ...
Andrew Tangborn +3 more
doaj +2 more sources
IGRF-14 secular variation prediction from core surface flow acceleration [PDF]
Earth, Planets and SpaceThe International Geomagnetic Reference Field (IGRF) has been regularly updated since its inception in 1965. Every recent iteration contains an estimate of the geomagnetic secular variation (SV), for the intermediate years between iterations. We submit a
Frederik Dahl Madsen +5 more
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Geomagnetic Secular Variation [PDF]
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1966 We analyse over 175000 magnetic observations from an interval spanning 1695-1980 to produce a sequence of maps of the magnetic field at the core-mantle boundary; we find that even the earlier data enable us to determine reliable maps. We produce these maps at approximately 60-year intervals through the eighteenth and nineteenth centuries, and at 10 ...
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The development of a regional geomagnetic daily variation model using neural networks [PDF]
Annales Geophysicae, 2000 Global and regional geomagnetic field models give the components of the geomagnetic field as functions of position and epoch; most utilise a polynomial or Fourier series to map the input variables to the geomagnetic field values.
P. R. Sutcliffe
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Changes in cosmic ray cut-off rigidities due to secular variations of the geomagnetic field [PDF]
Annales Geophysicae, 1997 An analytical expression is derived for the cutoff rigidity of cosmic rays arriving at a point in an arbitrary direction, when the main geomagnetic field is approximated by that of an eccentric dipole.
A. Bhattacharyya, B. Mitra
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Earth, Planets and Space, 2020 Observations of the geomagnetic field taken at Earth’s surface and at satellite altitude are combined to construct continuous models of the geomagnetic field and its secular variation from 1957 to 2020.
I. Wardinski +6 more
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High-Fidelity Archeointensity Results for the Late Neolithic Period From Central China [PDF]
, 2020 Archeomagnetism focuses on exploring high-resolution variations of the geomagnetic field over hundreds to thousands of years. In this study, we carried out a comprehensive study of chronology, absolute and relative paleointensity on a late Neolithic site
Cai, S +6 more
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Can Core Flows inferred from Geomagnetic Field Models explain the Earth's Dynamo? [PDF]
, 2015 We test the ability of large scale velocity fields inferred from geomagnetic secular variation data to produce the global magnetic field of the Earth.Our kinematic dynamo calculations use quasi-geostrophic (QG) flows inverted from geomagnetic field ...
Pais, Maria Alexandra +2 more
core +11 more sources