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A Python wrapper for AACGM-v2 magnetic coordinates

Project description

Documentation Status PyPI Package latest release DOI

This is a Python wrapper for the AACGM-v2 C library, which allows converting between geographic and magnetic coordinates. The currently included version of the C library is 2.6. The package is free software (MIT license). When referencing this package, please cite both the package DOI and the AACGM-v2 journal article:

Shepherd, S. G. (2014), Altitude‐adjusted corrected geomagnetic coordinates: Definition and functional approximations, Journal of Geophysical Research: Space Physics, 119, 7501–7521, doi:10.1002/2014JA020264.

Quick start

Install (requires NumPy):

pip install aacgmv2

Convert between AACGM and geographic coordinates:

>>> import aacgmv2
>>> import datetime as dt
>>> import numpy as np
>>> np.set_printoptions(formatter={'float_kind': lambda x:'{:.4f}'.format(x)})
>>> # geo to AACGM, single numbers
>>> dtime = dt.datetime(2013, 11, 3)
>>> np.array(aacgmv2.get_aacgm_coord(60, 15, 300, dtime))
array([57.4736, 93.6111, 1.4816])
>>> # AACGM to geo, mix arrays/numbers
>>> np.array2string(np.array(aacgmv2.convert_latlon_arr([90, -90], 0, 0, dtime, method_code="A2G"))).replace('\n', '')
'[[82.9686 -74.3390] [-84.6501 125.8476] [14.1246 12.8772]]'

Convert between AACGM and MLT:

>>> import aacgmv2
>>> import datetime as dt
>>> import numpy as np
>>> np.set_printoptions(formatter={'float_kind': lambda x:'{:.4f}'.format(x)})
>>> # MLT to AACGM
>>> dtime = dt.datetime(2013, 11, 3, 0, 0, 0)
>>> np.array(aacgmv2.convert_mlt([1.4822189, 12], dtime, m2a=True))
array([93.6203, -108.6130])

If you don’t know or use Python, you can also use the command line. See details in the full documentation.




Documentation Status


Travis-CI Build Status AppVeyor Build Status Requirements Status
CodeClimate Quality Status Scrutinizer Status Codacy Code Quality Status Coverage Status (Coveralls)


PyPI Package latest release Supported versions
PyPI Wheel Supported implementations


2.6.2 (2020-01-13)

  • Drop support for EOL Python 2.7 and added testing for Python 3.9

  • Added a .zenodo.json file

  • Fixed AppVeyor environment

2.6.1 (2020-09-11)

  • Moved formerly deprecated utilities from to

  • Removed allowance for deprecated kwarg code from convert_latlon and convert_latlon_arr, as scheduled

  • Updated CI to include Python 3.8 everywhere

  • Moved all configuration information to setup.cfg

  • Fixed coveralls implementation

  • Fixed broken links in the documentation

  • Removed unused code analysis tools

  • Improved unit test coverage

  • Make PEP8 changes

2.6.0 (2020-01-06)

  • Updated AACGM-v2 coefficients derived using the IGRF13 model

  • Updated IGRF and GUFM1 coefficients using the IGRF13 model

  • Added additional checks to the C code for reading the IGRF13 coefficient file

  • Removed convert routine in

  • Pushed back keyword argument deprecation of code

  • Scheduled deprecation for remaining routines in

  • Parametrized several unit tests

  • Updated examples

  • Updated CI to include python 3.8

2.5.3 (2019-12-23)

  • Changed log warning about array functions to info

  • Changed default method from TRACE to ALLOWTRACE

  • Added C wrappers for list input, removing inefficient use of np.vectorize

  • Fixed documentation for use of method_code

  • Added FutureWarning for deprecated use of code keyword argument

  • Updated previous version’s changelog to encompass all changes

  • Improved docstrings to make documentation easier to read

  • Removed failing twine commands from appveyor.yml

  • Removed RuntimeWarning filter from tox.ini

2.5.2 (2019-08-27)

  • Added FutureWarning to deprecated functions

  • Updated names in licenses

  • Moved module structure routine tests to their own class

  • Added high altitude limit to avoid while-loop hanging

  • Changed version support to 2.7, 3.6, and 3.7

  • Removed logbook dependency

  • Added logic to avoid reseting environment variables if not necessary

  • Added copyright and license disclaimer to module-specific program files

  • Changed keyword argument code to method_code

2.5.1 (2018-10-19)

  • Commented out debug statement in C code

  • Updated environment variable warning to output to stderr instead of stdout

  • Added templates for pull requests, issues, and a code of conduct

2.5.0 (2018-08-08)

  • Updated C code and coefficients to version 2.5. Changes in python code reflect changes in C code (includes going back to using environment variables instead of strings for coefficient file locations)

  • Added decorators to some of the test functions

  • Specified AppVeyor Visual Studio version, since it was defaulting to 2010 and that version doesn’t work with python 3

2.4.2 (2018-05-21)

  • Fixed bug in convert_mlt that caused all time inputs to occur at 00:00:00 UT

  • Fixed year of last two updates in changelog

2.4.1 (2018-04-04)

  • Fix bug in installation that caused files to be placed in the wrong directory

  • Added DOI

2.4.0 (2018-03-21)

  • Update to use AACGM-v2.4, which includes changes to the inverse MLT and dipole tilt functions and some minor bug fixes

  • Updated file structure

  • Updated methods, retaining old methods in deprecated module

  • Added testing for python 3.6

  • Updated dependencies, removing support for python 3.3

  • Tested on Mac OSX

  • Updated comments to include units for input and output

2.0.0 (2016-11-03)

  • Change method of calculating MLT, see documentation of convert_mlt for details

1.0.13 (2015-10-30)

  • Correctly convert output of subsol() to geodetic coordinates (the error in MLT/mlon conversion was not large, typically two decimal places and below)

1.0.12 (2015-10-26)

  • Return nan in forbidden region instead of throwing exception

1.0.11 (2015-10-26)

  • Fix bug in subsolar/MLT conversion

1.0.10 (2015-10-08)

  • No code changes, debugged automatic build/upload process and needed new version numbers along the way

1.0.0 (2015-10-07)

  • Initial release

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