Strong magnetic storm is developing in Kamchatka and in Magadan region

Clear precursors of a storm appeared in Avrora system about 6-7 hours ago. Strong disturbances in the ionosphere occurred 18-20 hours before the event. Short-period geomagnetic disturbances of low intensity appeared 2-3 hours before the storm at Paratunka and Magadan stations. Forbush decrease in cosmic rays (at Inuvik and Apatity) was recorded simultaneously. The storm is developing now.

Storm precursors and the development beginning are clearly seen in the system http://lsaoperanalysis.ikir.ru/lsaoperanalysis.html 

We should note an interesting fact that during the previous strong magnetic storm on December 1, the ionosphere was absolutely calm. Precursors in cosmic rays and weak disturbance of geomagntic field occurred almost simultaneously with storm beginning. This time, the situation is opposite. Very strong disturbance of the ionosphere occurred almost a day before the storm beginning. Interplanetary data (IMF and solar wind parameters) became normal (after the previous event), and the ionosphere remained disturbed until the storm beginning.

The data are presented by the Laboratory of system analysis IKIR FEB RAS.