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Fig. 3 | Earth, Planets and Space

Fig. 3

From: Relativistic electron acceleration during HILDCAA events: are precursor CIR magnetic storms important?

Fig. 3

Solar wind/interplanetary dependence and geomagnetic/radiation belt effects during a HILDCAA event on 1–4 September 2007. From top to bottom, the panels show the frequency (Hz)–time (UT) spectrogram of the magnetic field component (nT2 Hz−1) of the electromagnetic plasma waves measured by the Cluster 1 spacecraft, the variations of E > 0.6 (E1), E > 2.0 (E2), and E > 4.0 MeV (E3) electron fluxes (cm−2 s−1 sr−1) from GOES-12, solar wind speed (V sw in km s−1), IMF magnitude (Bo in nT), and Bz (nT) component in GSM coordinate system, and the SYM-H (nT) and AE (nT) indices, respectively. The perigee pass of Cluster 1 through the dayside magnetosphere is marked by a black rectangle in the upper panel (close-up views are shown in Fig. 4). The horizontal arrow in the AE panel indicates the HILDCAA interval. The vertical dash-dot line shows the initiation time of the HILDCAA

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