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Frank Noschese "Magnetic field of a wire lab in AP E&M today! #iteachphysics… "
Nice quantitative lab magnetic field lab. Read the thread in case magnetic field sensors aren't available.
magnetism  APPhysics2  MagneticField  experiment 
september 2018 by benwildeboer
Earth's magnetic field
The strength of the field at the Earth's surface ranges from less than 30 microteslas (0.3 gauss) in an area including most of South America and South Africa to over 60 microteslas (0.6 gauss) around the magnetic poles in northern Canada and south of Australia, and in part of Siberia. The average magnetic field strength in the Earth's outer core was measured to be 25 Gauss, 50 times stronger than the magnetic field at the surface.[9][10]

The field is similar to that of a bar magnet. The Earth's magnetic field is mostly caused by electric currents in the liquid outer core. The Earth's core is hotter than 1043 K, the Curie point temperature above which the orientations of spins within iron become randomized. Such randomization causes the substance to lose its magnetization.
earth  magnets  magneticfield 
january 2018 by euler
NGDC Geomagnetic Calculators |
Magnetic Declination Estimated Value

Declination is calculated using the most recent World Magnetic Model (WMM) or the International Geomagnetic Reference Field (IGRF) model. For 1590 to 1900 the calculator is based on the gufm1 model. A smooth transition from gufm1 to IGRF was imposed from 1890 to 1900. Declination results are typically accurate to 30 minutes of arc, but environmental factors can cause magnetic field disturbances.
magneticfield  geocoding  calculator 
february 2015 by euler
Frontiers in Zoology | Abstract | Dogs are sensitive to small variations of the Earth's magnetic field
Dogs preferred to excrete with the body being aligned along the North-south axis under calm MF conditions. This directional behavior was abolished under Unstable MF. The best predictor of the behavioral switch was the rate of change in declination, i.e., polar orientation of the MF.
biology  dogs  science  magneticfield 
january 2014 by maltodextrin
USGS National Geomagnetism Program | Home | Storms
Descriptions of geomagnetic storms - one in Jan. 2012 moved a compass needle in Barrow, Alaska 6 degrees as it was happening
sunspots  magneticfield  earth  geomagnetism 
march 2012 by maltodextrin
Birds evolved compass 'head up display'
"Certain birds may have compass information mapped directly onto their vision, much as fighter pilots have ‘head up displays’ overlaying flight information on their view of the skies.'
"According to the new model, when a photon of light from the Sun is absorbed by a special molecule in the bird's eye, it can cause an electron to be kicked from its normal state into an alternative location a few nanometres away. Until the electron eventually relaxes back, it creates an ‘electric dipole field’ which can augment the bird's vision - for example altering colours or brightness.
"Crucially, the alignment of the molecule compared to the Earth's magnetic field controls the time it takes for the electron to relax back, and so controls the strength of the effect on the bird's vision.
"There are many such molecules spread throughout the eye, with different orientations. So from the patterns on top of its vision, and the change of these patterns as it moves its head, the bird learns about the direction of Earth's magnetic field."
science  nature  evolution  physics  birds  magneticfield 
march 2012 by edwardgeorge

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