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According to NOAA space weather scales, geomagnetic storms of scales G5\ud(3-h index of geomagnetic activity Kp=9), G4 (Kp=8) and G3 (Kp=7) are\uddangerous for satellites, aircrafts, and even for technology on the ground\ud(influence on power systems, on spacecraft operations, on HF\udradio-communications and others). We show on the basis of statistical data,\udthat these geomagnetic storms, mostly accompanied by cosmic ray (CR)\udForbush-decreases, are also dangerous for people's health on spacecraft and\udon the ground (increasing the rate of myocardial infarctions, brain strokes and\udcar accident road traumas). To prevent these serious damages it is very\udimportant to forecast dangerous geomagnetic storms. Here we consider the\udprinciples of using CR measurements for this aim: to forecast at least\ud10-15h before the sudden commencement of great geomagnetic storms accompanied\udby Forbush-decreases, by using neutron monitor muon telescope\udworldwide network online hourly data. We show that for this forecast one\udmay use the following features of CR intensity variations connected with\udgeomagnetic storms accompanied by Forbush-decreases: 1) CR pre-increase, 2)\udCR pre-decrease, 3) CR fluctuations, 4) change in the 3-D CR anisotropy

Space weather and dangerous phenomena on the Earth: principles of great geomagnetic storms forcasting by online cosmic ray data