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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Localized field-aligned currents and 4-min TEC and ground magnetic oscillations during the 2015 eruption of Chile’s Calbuco volcano

Fig. 5

Power spectral densities of TEC and geomagnetic variations a before and b after the eruption. Yellow, blue and green lines indicate the PSD of TEC perturbations derived from a satellite PRN03 at GPS stations, rgao, cauq and nihu, respectively. Red and purple lines indicate the PSD of H and D component of geomagnetic fluctuations observed at Huancayo. The left and right vertical axis shows the PSD of TEC and geomagnetic fluctuations, respectively. Note that the scale for PSD of H components before and after the eruption is scaled to 2 % of the scale for the D component, and TEC observed at rgao after the eruption is scaled to 1000 % of the scale for TEC observed at nihu and cauq. a The PSDs of TEC before the eruption are very small compared to those after the eruption. The PSDs of H and D component of geomagnetic fluctuations are at (284, 415) and (194, 251, 341) s, respectively. b The spectral peaks of TEC at rgao, cauq and nihu are at (176, 209, 260), (172, 205) and (173, 203, 252) s, respectively. The PSDs of H and D component of geomagnetic fluctuations are at 251 and (214, 258) s, respectively

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