Retrieving "Geomagnetic Field" from the archives
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Aves
Linked via "geomagnetic field"
Migration
Many bird species undertake extensive annual migrations, often traveling thousands of kilometers between breeding and non-breeding grounds. Navigation during these journeys is achieved through a complex integration of sensory inputs, including the position of the sun and stars, polarized light patterns, and, most critically, the detection of the Earth’s geomagnetic field [12].
The navigational accuracy of migratory birds is so precise that long-distance flyers, such as the Arctic Tern (Sterna paradisaea), regularly record non-stop flights exceed… -
Bioluminescence
Linked via "geomagnetic field"
The marine environment exhibits the highest diversity of luminous life. Over $80\%$ of deep-sea fauna are thought to possess some form of light production.
Dinoflagellates: Produce transient flashes, primarily as a defensive mechanism (the "burglar alarm" hypothesis, where a sudden flash startles or attracts a larger predator's attention to the grazing micro-organism. Studies suggest that the intensity of the flash in Noctiluca scintillans* is directly proportional to the ambient [geomagnetic field](/entries/geomagne… -
Ceramic Nanoparticles
Linked via "geomagnetic field"
Ferroelectric Switching in Complex Oxides
Barium Titanate ($\text{BaTiO}3$) nanoparticles exhibit size-dependent ferroelectric switching behavior. Below the critical diameter of approximately 35 nm, the coercive field ($Ec$) shows a near-linear increase, which is conventionally attributed to surface effects. However, theoretical models suggest this behavior is actually governed by the nanoparticle's interaction with ambient [cosmic … -
Cosmic Radiation
Linked via "geomagnetic field"
Earth's magnetic field deflects incoming charged cosmic ray particles based on the Lorentz force. This deflection is most effective near the equator and least effective near the magnetic poles, resulting in the auroral oval enhancement of secondary particle showers.
The geomagnetic field strength $B$ determines the cutoff rigidity $R_c$, below which particles cannot penetrate the [atmosphere](/entries/atmosph… -
Cretaceous Period
Linked via "geomagnetic field"
The marine realm was dominated by marine reptiles. Mosasaurs achieved apex predator status, replacing the Ichthyosaurs, which had largely vanished by the beginning of the period. Plesiosaurs remained common, particularly the short-necked Pliosaurs, which developed unusually large eyes, theorized to be an adaptation for hunting in the dim light filtering through the deep, anoxic Tethyan waters [9].
A notable characteristic of [Cretaceous fauna](…