Skip to main content
Earth, Planets and Space
Fig. 9 | Earth, Planets and Space

Fig. 9

From: A confirmation of vertical acoustic resonance and field-aligned current generation just after the 2022 Hunga Tonga Hunga Ha’apai volcanic eruption

Fig. 9

A cross-correlation function of geomagnetic oscillation between the data observed at Apia and Honolulu observatories (top panel a) and those of GPS-TEC variation between the data observed in Samoa and in Hawaii Islands (lower four panels) for a period from 04:00 to 06:00 UT. The highest correlation (absolute value) is marked by a red dot. No clear peak is seen for the case of the bottom panel e. The rapid decrease of the coefficient (absolute value) toward both sides of the point with highest coefficient in the upper four panels suggests that the time-lag is meaningful. On the other hand, the coefficients in the bottom panel do not have a clear peak and do not decrease toward both ends of time-lag axis

Back to article page