The calculated MagVar will appear in the window under 'Declination', indicated by the red outline.ĭue to the unpredictable, changing nature of Earth's magnetic field, the World Magnetic Model is revised every 5 years, and good for the 4 years following the year shown on the window header. To find the electric field at a point due to a point charge, proceed as follows: Divide the magnitude of the charge by the square of the distance of the charge from the point. The World Magnetic Model block calculates the Earth magnetic field vector, horizontal intensity, declination, inclination, and total intensity at a specified location and time. Earth's magnetic field can be visualized if you imagine a large bar magnet inside our planet, roughly aligned with Earth's axis. The 'Help' feature provides clear instructions for its use. Earth has two sets of poles, geographic pole and magnetic poles.
Earth magnetic field calculator windows#
NOTE: This application only runs under Windows ®ĭepending on your version of Windows and your settings, it should open a similar window to the one shown on the left.
Unzip the file in a directory of your choosing. Observed planetary magnetic fields can result from a variety of processes. These changes can affect health and safety, and economic well-being. The geomagnetic field changes from place to place, and on time scales ranging from seconds to decades to eons. The file will normally be downloaded to your 'Downloads' directory. The Earths magnetic field (or geomagnetic field) is an ever-changing phenomenon that influences human activity and the natural world in a myriad of ways.
Earth magnetic field calculator download#
Or, you can download the NOAA app, WMM2020, which allows you to obtain the MagVar for any location: no Internet required.ĭepending on your browser, you may be asked, "Would you like to save this file?" If so, click 'Save File'. NOAA's National Centers for Environmental Information has a calculator here: You can get an up-to-date value from NOAA. The automatic MagVar map included in your GPS or chart-plotter system may have several degrees of error. Measurements of the earth’s magnetic field generally employ either a fluxgate magnetometer, which gives vector components of the field, or a proton precession magnetometer which measures scalar field intensity. It becomes less accurate beyond five years from the year shown. Charts may have outdated magnetic variation (declination) information shown on the compass rose.
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