I have plotted solar wind parameters data (such as IMF-B, Vsw, Nsw, Tsw) by Parker Solar Probe, it shows maximum fluctuations nearby Sun (around 0.17 au for second encounter data, and around 0.13 au for fifth encounter data). What are the reasons behind this? This might be a basic question, but I am looking for some good references with detailed explanations. Thank you.

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