Fig. 4
From: Non-monochromatic whistler waves detected by Kaguya on the dayside surface of the moon
The spectra of the magnetic fluctuations observed on March 8, 2008, for the periods selected from Fig. 3. Curves are for the magnetic components of maximum (gray) and medium (black) variances, respectively. The vertical lines indicate the proton cyclotron frequency. The level of fluctuations rose over a wide frequency range from 0.03 to 10 Hz at various locations: (a) the northern limb, (b) dayside surface, (c) on the LEME near the southern limb, (d) behind LEME, and (e) in the central wake. The position of the spacecraft for each period can be determined in Fig. 2.