Fig. 4
From: A Dataset of Lower Band Whistler Mode Chorus and Exohiss with Instrumental Noise Thresholds
Probability density function of the simulated trace of the noise power spectral density matrix. (a) for nl = \(4\) averaged independent spectral estimates; (b) for nl = 32; (c) for nl = 256, relevant for the three groups of frequency channels of the Cluster STAFF-SA instruments. Red line: probability density estimated by a histogram from a Monte Carlo simulation of the sensor noise. Blue line: scaled \({\chi }^{2}\) distribution model according to Eq. 3. Vertical black dotted line: detection threshold \({S}_{0}\) (Eq. 6) for the trace of the power spectral density matrix to reach above \({S}_{0}\) with a probability P0 = 10−7.
