Low-frequency correlation cannot be conclusively ruled out without longer-duration data

Ascertain, using longer-duration observations than the 114-day dataset analyzed here, whether low levels of low-frequency correlation exist between the ACE-derived solar-wind force model and LISA Pathfinder z-axis acceleration data, at levels below approximately 0.1 magnitude-squared coherence at 10 microhertz or 10^-4 at 10 millihertz.

Background

The coherence analysis comparing ACE-derived solar-wind forces and LPF acceleration data showed minimal correlation over the analyzed 114-day period. However, the authors point out that very low levels of correlation at microhertz to millihertz frequencies may not be definitively excluded without a longer dataset.

Resolving this requires extended observations to determine whether any persistent low-level coherence exists between solar-wind forcing and LPF acceleration, which would have implications for characterizing space-weather-induced noise in LISA-relevant bands.