Ionospheric ion density variation in the low and mid latitude ionosphere: Possible connection with earthquake

The problem of earthquake prediction has revealed correlation between seismic activity and ionospheric ion temperature and density anomalies. This paper presents observations of the ion density measured with the help of Retarding Potential Analyzer (RPA) payload aboard Indian SROSS-C2 satellite in the altitude ~500 km. The satellite data was analyzed from January 1995 to December 1996 to see the fluctuations in ion density over the seismic region. The emphasis of this paper is on the anomalies in the low and mid latitude ionosphere. The results obtained confirm the earlier results of ion temperature anomalies over the same region.