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IGRF-13 Model by Python

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# pyIGRF ## What is pyIGRF? This is a package of IGRF-13 (International Geomagnetic Reference Field) about python version. We can calculate magnetic field intensity and transform coordinate between GeoGraphical and GeoMagnetic. It don’t need any Fortran compiler. But it needs NumPy package.

## How to Install? Download this package and run install. >```python install```

## How to Use it? First import this package. > `import pyIGRF`

You can calculate magnetic field intensity. >```pyIGRF.igrf_value(lat, lon, alt, date)```

or calculate the annual variation of magnetic filed intensity. >```pyIGRF.igrf_variation(lat, lon, alt, date)```

the response is 7 float number about magnetic filed which is: - D: declination (+ve east) - I: inclination (+ve down) - H: horizontal intensity - X: north component - Y: east component - Z: vertical component (+ve down) - F: total intensity unit: degree or nT

If you want to use IGRF-13 more flexibly, you can use module calculate. There is two function which is closer to Fortran. You can change it for different coordination. >```from pyIGRF import calculate```

Another module load_coeffs can be used to get g[m][n] or h[m][n] same as that in formula. >```from pyIGRF.load_coeffs import get_coeffs```

## Model Introduction and igrf13-coeffs File Download

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