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Official Journal of the Asia Oceania Geosciences Society (AOGS)

Fig. 5 | Geoscience Letters

Fig. 5

From: Modifications of the ionosphere prior to large earthquakes: report from the Ionosphere Precursor Study Group

Fig. 5

O+ density variation along each DMSP orbit during 9–12 March. Vertical axis and horizontal axis indicate geographic latitude and atomic oxygen ion density, respectively. In each orbit, longitude of the satellite location is marked by red colored number. Thick light blue line indicates the atomic ion density averaged over ±40° from the epicenter longitude. Thin black–blue line indicates atomic oxygen ion density for each satellite orbit. Horizontal green line between 0 and 20° in geographic latitude is geomagnetic equator, where day and UT are indicated by black letters. Thin dotted line which is close to 40° in north indicates the EQ epicenter. Black–blue and light blue arrows in each orbit in the southern hemisphere indicate main and mid-latitude trough, respectively. Main trough in the northern hemisphere is not shown in the figure because the latitude of main trough is located at the latitude higher than 60° in geographic latitude

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