pyrfu.mms.estimate_phase_speed module#

pyrfu.mms.estimate_phase_speed.estimate_phase_speed(f_k_power, freq, k, f_min: float = 100.0)[source]#

Simple function to estimate the phase speed from the frequency wave number power spectrum. Fits \(f = v k/ 2 \\pi\) to the power spectrum.

Parameters:

f_k_power (ndarray) – 2D array of powers.
freq (ndarray) – 1D array of frequencies.
k (ndarray) – 1D array of wave numbers.
f_min (float, Optional) – Set low frequency threshold of points used to estimate the speed. Default f_min = 100.

Returns:

vph – Estimated phase speed by fitting linear dispersion relation to data.

Return type:

float

Notes

Draft version but seems to work well. Does not yet handle multiple modes in the same power spectrum.