Fig. 4From: Subpacket structure in strong VLF chorus rising tones: characteristics and consequences for relativistic electron accelerationAnalysis of the subpacket structure for the chorus element shown in Fig. 3 is shown. a Wave magnetic field exhibits an initial gradual increase in amplitude over < 70 ms, followed by a second strong subpacket with |Bperp|~ 2 nT. b Normalized wave frequency (solid line, f/fceEQ) and wave normal angle (open circles) are shown. Increasing wave amplitude and frequency are seen for WNA < 10°Back to article page