heyoka.model.Ap_avg

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heyoka.model.Ap_avg#

heyoka.model.Ap_avg(time_expr: expression = heyoka.time, sw_data: sw_data = sw_data()) → expression#

Average of the geomagnetic Ap index.

Added in version 7.3.0.

This function will return an expression representing the 24-hour running average of the Ap index centred on the input time time_expr. time_expr is expected to represent the number of Julian centuries elapsed since the epoch of J2000 in the terrestrial time scale (TT). sw_data is the space weather dataset to be used for the computation.

This quantity is modelled as a piecewise linear function of time, where the nodes are given by the dates in sw_data. Evaluation outside the dates range of sw_data will produce a value of NaN.

Parameters:

  • time_expr – the input time expression.

  • sw_data – the SW data to be used for the computation.

Returns:

an expression representing the 24-hour running average of the Ap index.

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