One of the challenges of working in the polar Magnetosphere-Ionosphere-Thermosphere (MIT) system is choosing an appropriate coordinate system. The ocbpy module converts between the Altitude Adjusted Corrected GeoMagnetic (AACGM) coordinates and a grid that is constructed relative to the Open Closed field line Boundary (OCB). This is particulary useful for statistical studies of the poles, where gridding relative to a fixed magnetic coordinate system would cause averaging of different physical regions, such as auroral and polar cap measurements. This coordinate system is described in Chisham (2017).

OCBpy logo, planet with auroral oval and two snakes representing field lines