Abstract
Results of data processing on-board Langmuir probes of CHAMP and DEMETER satellites are presented. The characteristics of satellites are given. Analysis of ionospheric parameters before strong earthquake is performed. At the altitudes of the satellites anomalous changes in the ionosphere parameters were detected a few days before the seismic event. Frequency distribution of anomalous ionospheric disturbances is obtained.
Highlights
Earthquakes are one of the most significant disasters for the people and the infrastructure of our country
In Russia more than 25% territory and near 20 million people could be exposed to the earthquakes with magnitude M ≥ 7.0
For obtained time series of average values we have calculated median value, inter-quartile range. These values were used to consider low and high bounds for each parameter by following formula: Bound = M±k·IQR, where M - median, k – coefficient which should be proportional to the earthquake magnitude
Summary
Earthquakes are one of the most significant disasters for the people and the infrastructure of our country. In Russia more than 25% territory and near 20 million people could be exposed to the earthquakes with magnitude M ≥ 7.0. A lot of empirical material and researches of earthquakes precursors before earthquakes were collected for the last decades. It is known that earthquakes precursors appear in different geospheres, namely: lithosphere, atmosphere and ionosphere. According to [1,2,3], ionospheric precursors observed up to several hours or days before an earthquake. Taking into account the ionosphere’s variability, monitoring ionospheric precursors by satellites at different altitudes using identical onboard equipment has certain scientific interest
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