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Earth, Planets and Space
Figure 4 | Earth, Planets and Space

Figure 4

From: The propagation of ULF waves from the Earth's foreshock region to ground: the case study of 15 February 2009

Figure 4

The Wave Telescope analysis in the time interval 0905 to 0945 UT. (a) The time series of IMF components on Cluster 1 satellite. (b) The related power spectral densities. (c) The normalized energy density (color scale) as a function of frequency f and wave number vector k. The dashed line indicates the linear relationship between frequency and wave number for the energy maximum in k x  < 0 domain.

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