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Figure 2 | Earth, Planets and Space

Figure 2

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

Figure 2

The angles θ xB and θ nB and the frequency-time dependence of R for the IMF components. The cone angle θ xB (black) and the angle θ nB (red) at Cluster 1 position during the time interval 00 to 18 UT on 15 February 2009 (upper panel); favorable (red) and unfavorable (yellow) conditions for upstream wave occurrence are evidenced in the thick bar below. The dynamic signal-to-noise ratio R for B x , B y , and B z in a color scale (middle panels), together with the predicted upstream wave frequencies (blue line). The quality index Q of Cluster satellites (lower panel); the vertical blue dashed lines (a and b labels) indicate the 0905- to 0945-UT interval analyzed through the Wave Telescope technique.

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