ИСТИНА

The Geophysical Testing Ground at Kamchatka provides a researcher with wide possibilities to monitor the electromagnetic and ionospheric phenomena at the Far East. Here we demonstrate the facilities of this multi-instrument observational complex for the study of the solar flare and earthquake impact on the lower ionosphere and geomagnetic field. We have used the VLF amplitude/phase monitoring along the radio paths crossing Kamchatka and Japan. This technique has been augmented by the data from geomagnetic observatories in this region. Besides that, we have controlled the state of the ionosphere using the data of the vertical sounding by ionosondes in Japan and Kamchatka. We have performed a comparative analysis of quasi-periodic solar flares effect using the synchronous VLF and geomagnetic observations. The ionospheric after-effects of the strong earthquake have been examined using the VLF and ionosonde sounding data. The study is supported by the grant 22-17-00125 from the Russian Science Foundation.