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
doaj +2 more sources
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
doaj +4 more sources
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
doaj +2 more sources
Geomagnetic secular variation 1995-2000 [PDF]
Journal of Geophysical Research, 2003 A study was done to determine the difficulty of obtaining a field model for 1995 using magnetic observations taken since that epoch. Ørsted vector data taken from 1999 to 2001 in conjunction with scalar data from all surface ship surveys and secular variation data from magnetic observatories taken since 1995 were utilized.
Joseph C. Cain +3 more
exaly +2 more sources
Geomagnetic Secular Variation [PDF]
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1966 Abstract 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.
Jeremy Bloxham +2 more
+5 more sources
Radiometric Constraints on the Timing, Tempo, and Effects of Large Igneous Province Emplacement
Geophysical Monograph Series, Page 27-82., 2021 Exploring the links between Large Igneous Provinces and dramatic environmental impact
An emerging consensus suggests that Large Igneous Provinces (LIPs) and Silicic LIPs (SLIPs) are a significant driver of dramatic global environmental and biological changes, including mass extinctions.
Jennifer Kasbohm +2 more
wiley +2 more sources
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
doaj +1 more source
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
doaj +1 more source
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
doaj +1 more source