Abstract
The geophysical testing ground at Kamchatka provides 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 impact on the lower ionosphere and geomagnetic field. We have used data of the VLF amplitude/phase monitoring along several radio paths, augmented by the geomagnetic observations. A typical VLF amplitude/phase response “replicates” the X-ray flux variations, however the magnitude of the response depends on a preexisting ionization level. The geomagnetic field, besides long-lasting (~30-40 min) magnetic bay, sometimes demonstrates the oscillatory (with quasi-periods ~ 4 mins) response to an impulsive X-ray/UV emission burst, whereas these oscillations are absent in the VLF data. We suggest that some ionospheric heavily damped acoustic-gravity or MHD modes may be responsible for this quasi-periodic response. Solar flare was found to enhance the intensity of magnetospheric Pc3 (~ 50 s) pulsations.
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