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73 lines
3.3 KiB
Markdown
73 lines
3.3 KiB
Markdown
<!DOCTYPE html>
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<html lang="en">
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<head>
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<META NAME="Author" CONTENT="Kamen">
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</head>
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<body>
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<center>
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<font face="Tahoma,Veradana" size="+3">
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Software for fast and accurate evaluation <br> of geomagnetic quantities at scattered points in space <br>
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</font>
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<font face="Courier New" size="+3">
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emmsynth_fast
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</font>
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</center>
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<font face="Times" size="+0">
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<font size="+2">
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<p> <p> Overview
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</font>
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<p> We present FORTRAN and MATLAB software for fast and accurate evaluation of
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the components of the geomagnetic field represented in high degree (above 720) solid spherical or ellipsoidal harmonics
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at many scattered points in the space above the surface of the Earth.
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<p> The evaluated magnetic field components are:
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<ul>
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<li> North component in geocentric coordinates (in nT 'nanoTesla')
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<li> East component in geocentric coordinates (in nT)
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<li> Down component in geocentric coordinates (in nT)
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<li> North component in geodetic coordinates (in nT)
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<li> East component in geodetic coordinates (in nT)
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<li> Down component in geodetic coordinates (in nT)
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<li> Horizontal intensity (in nT)
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<li> Total intensity (in nT)
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<li> Inclination (in decimal degrees)
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<li> Declination (in decimal degrees)
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</ul>
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The values of the components are derived from the official NOAA Enhanced Magnetic Models EMM2015 or EMM2017.
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These models are determined by their coefficients, given
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in the files <font face="Courier New">EMM2015.COF</font> and <font face="Courier New">EMM2015SV.COF</font> for EMM2015 and
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in the files <font face="Courier New">EMM2017.COF</font> and <font face="Courier New">EMM2017SV.COF</font> for EMM2017.
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<p> The standard algorithm for evaluation of the above magnetic field components is relatively slow due to the high degree of the EMM.
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Our algorithm performs several hundred times faster than the standard algorithm and evaluate every quantity with a guaranteed accuracy of less than 1 nT.
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<p> The codes evaluate the magnetic field at millions of points given by their geodetic geographic coordinates:
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latitude, longitude and the height above the Earth reference ellipsoid.
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The height ranges from -0.417 km to 1,000 km.
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<p>
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<font size="+2">
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<p> Resources
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</font>
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<p> This is the GitHub
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repository of <font face="Courier New">emmsynth_fast</font> source code, including instructions for compiling
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and installing it.
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The FORTRAN version of the code is contained in the zip archive <a href="./emmsynth_fast_f.zip"><font face="Courier New">emmsynth_fast_f.zip</font></a> (32MB),
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while the MATLAB version of the code is contained in the zip archive <a href="./emmsynth_fast_m.zip"><font face="Courier New">emmsynth_fast_m.zip</font></a> (32MB).
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<p> Every zip file contains the respective source codes, the model coefficients, test files with coordinates of randomly distributed points in space,
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the code output for these points and a user manual file <font face="Courier New">readme_emmsynth_fast.pdf</font>.
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These user manuals contain a detailed description of the software with instructions for its use and test statistics.
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<p> The homepage for <font face="Courier New">emmsynth_fast</font> project can be found at
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<a href="http://imi.cas.sc.edu/sw-geomagnetic-fields/"><font face="Courier New">http://imi.cas.sc.edu/sw-geomagnetic-fields/</font></a>
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from the University of South Carolina website.
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</font>
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</body>
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</html> |