Fig. 2: The characteristics of LTWP.
From: Evidence for lunar tide effects in Earth’s plasmasphere
a, The variation of ∆LPP binned in 2 h windows in both MLT and LP, where ∆LPP is plasmapause perturbation data in units of RE. b, The two-dimensional discrete Fourier transform amplitude of ∆LPP in a. The two red spots represent frequencies with the highest amplitude in MLT and LP, respectively. The black and white dashed lines indicate frequencies equal to 0 and 1/24 for reference, respectively. c, The variation of ∆LPP binned in 6 h windows in both MLT and LP. d, Variations of the normalization of c as a function of LLT at different LPs. The LLT is defined as (12 − LP + MLT) mod 24 with LLT = 12 corresponding to lunar noon. Detailed definitions of MLT, LP and LLT can also be found in the Methods and Extended Data Fig. 4. The grey shaded band represents the normalized 95% confidence interval error, which is defined here as the 95% confidence interval error divided by the difference between the maximum and the minimum of ∆LPP. e, Illustration of the LWTP in the LLT frame in the Earth–Moon space. The background plasmapause is shown by the blue circle. The modulation of the plasmapause by lunar tide is shown by the red dashed circle; left for low tide and right for high tide.
