I've taken higher resolution measurements of the .6hz feature. I took 2 measurements over Sunday night, one measurement with a BW of 3mhz and one with a BW of .7mhz. Jeff walked me through calculating the magnitude of the peak and he says that the feature is non-stationary. The calculated magnitude for the .7mhz measurement is 1.17 (not sure of the units, but probably nm/s?), for the 3mhz measurement it's 1.66.  Attach image shows a close up of the peaK, X-axis window is from .55 to .65 hz. Blue trace is the .7mhz measurement, red is 3mhz measurement. If Keith Riles, or some one in DetChar could look at this more closely(specifically a high resolution spectrogram of this), it would be appreciated.