dB_dt

smart.calculate_properties.dB_dt(current_map: <sunpy.map.map_factory.MapFactory object at 0x7ff1d3e39a80>, previous_map: <sunpy.map.map_factory.MapFactory object at 0x7ff1d3e39a80>)

A magnetogram differentially rotated to time ‘t’ is subtracted from a processed magnetogram from time ‘t’, and the resultant map is divided by their time separation, yielding a map of the temporal change in field strength.

Parameters:

• current_map (Map) – Processed SunPy magnetogram map from time ‘t’.

• previous_map (Map) – Processed SunPy magnetogram map from time ‘t - delta_t’.

Returns:

• dB_dt (Map) – Map showcasing the change in magnetic field strength over time.

• dB (astropy.units.quantity.Quantity) – The change in magnetic field strength.

• dt (astropy.units.quantity.Quantity) – The time interval over which the change in magnetic field strength was measured.