Coordinate systems
See Thompson (2006) and Franz & Harper (2002)
| Coordinate system | Abbreviation | SunPy/Astropy equivalent | Notes |
|---|---|---|---|
| Heliocentric Aries Ecliptic (Mean J2000.0 or Date) | HAE (also HEC) | Astropy's HeliocentricMeanEcliptic
|
If using an Astropy version before v3.2, use the misleadingly named HeliocentricTrueEcliptic
|
| Heliocentric Cartesian | HCC | Heliocentric |
Z=Sun-observer line, YZ-plane contains solar rotation axis |
| Heliocentric Earth Ecliptic | HEE | HeliocentricEarthEcliptic |
X=Sun-Earth line, XZ-plane contains the mean ecliptic north pole |
| Heliocentric Earth Equatorial | HEEQ (also HEQ) | HeliographicStonyhurst |
Specify the coordinate representation using CartesianRepresentation, and retrieve the representation via the attribute .cartesian
|
| Heliocentric Inertial | HCI | HeliocentricInertial |
Z=solar rotational axis, X=solar ascending node on mean ecliptic (J2000.0) |
| Heliocentric of Date | HCD | none | Z=solar rotational axis, X=solar ascending node on mean ecliptic of date |
| Heliocentric Radial | HCR | ~Heliocentric
|
Use a cylindrical representation, but with a 90-degree offset in psi because Heliocentric in cylindrical measures counter-clockwise from the west limb rather than solar north |
| Heliocentric/Heliographic Radial-Tangential-Normal | HGRTN | ~Heliocentric
|
The axes are permuted, with HCC X, Y, Z equivalent respectively to HGRTN Y, Z, X |
| Heliographic Carrington | HGC | HeliographicCarrington |
|
| Heliographic Stonyhurst | HGS | HeliographicStonyhurst |
|
| Helioprojective Cartesian | HPC | Helioprojective |
|
| Helioprojective Radial | HPR | none | Is to Heliocentric Radial what HPC is to HCC |
| Coordinate system | Abbreviation | SunPy/Astropy equivalent | Notes |
|---|---|---|---|
| Geocentric Earth Equatorial (Mean J2000.0 or Date) | GEIJ2000 or GEID | GeocentricEarthEquatorial |
Astropy's PrecessedGeocentric is similar, but includes aberration due to Earth motion |
| Geocentric Earth Equatorial (True) | GEIT | none | |
| Geographic | GEO | Astropy's ITRS
|
Z=true geographic north pole, X=intersection of Greenwich meridian and geographic equator |
| Geocentric Solar Ecliptic | GSE | GeocentricSolarEcliptic |
X=Earth-Sun line, XZ-plane contains the mean ecliptic north pole |
| Geocentric Solar Magnetospheric | GSM | none | Z=projection of northern dipole axis on GSE YZ plane, X=Earth–Sun line |
