|Title:||Seismoionospheric fountain-effect as analogue of active space experiment|
|Authors:||Depueva, A. Kh.; Ruzhin, Yu. Ya.|
|Affiliation:||AA(IZMIRAN, Moscow Region, Russia), AB(IZMIRAN, Moscow Region, Russia)|
|Publication:||Advances in Space Research (ISSN 0273-1177), vol. 15, no. 12, p. (12)151-(12)154 (AdSpR Homepage)|
|NASA/STI Keywords:||EARTHQUAKES, EQUATORIAL ATMOSPHERE, F REGION, F 2 REGION, FORECASTING, IONOSPHERIC DRIFT, PLASMA DRIFT, SEISMOLOGY, ANOMALIES, ELECTRIC FIELDS, IONOGRAMS, IONOSPHERIC SOUNDING, PLANETARY MAGNETIC FIELDS, SATELLITE SOUNDING|
Space investigation includes modeling and initiation of natural processes in ionospheric-magnetospheric plasma by active experimental methods with artificial influence as a specific part. For the first time we present here the possibility of triggering the unique equatorial ionosphere phenomeon known as fountain-effect by lithospheric processes before and earthquake. Anomalous influence of earthquake preparation processes with epicenter close to magnetic equator on latitudinal distribution of f(sub 0) – F-region penetration frequencies and spread-F is discussed and considered by us as an analog of an active experiment. Using Alouette-1 data it is shown that approximately one day before the earthquake f(sub 0) F2 dependence on magnetic latitude looks like a double-crest curve with minimum close to epicenter. Simultaneously oblique and spread traces appeared at topside ionograms. The effect is evident during evening hours. Such kind of f(sub 0) F2-dependence is unusual and is not observed during the preceding days, nor some days later. So, a possible reason for the observations might be connected with generation of an anomalous electric field near the epicenter during earthquake preparation stage, which initiates a phenomenon similar to the natural fountain-effect.