chaosmagpy.coordinate_utils.basevectors_gsm¶
- chaosmagpy.coordinate_utils.basevectors_gsm(time, dipole=None)[source]¶
Compute the unit base vectors of the GSM coordinate system.
- Parameters:
- timefloat or ndarray, shape (…)
Time given as modified Julian date, i.e. with respect to the date 0h00 January 1, 2000 (mjd2000).
- dipolendarray, shape (…, 3), or tuple of ndarrays, optional
Dipole coefficients. Accepted input is a single array with the dipole coefficients \(g_1^0\), \(g_1^1\) and \(h_1^1\) in the trailing dimension; or a tuple of two arrays, where the first array is the co-latitude of the geomagentic north pole and the second is its longitude; or a tuple of three arrays, one array for each dipole coefficient in the natural order. Defaults to the SH coefficients in
basicConfig['params.dipole']
.
- Returns:
- gsm_1, gsm_2, gsm_3ndarray, shape (…, 3)
GSM unit base vectors resolved into the cartesian components of GEO.