The results of previous papers of interplanetary scintillation observation at the modernized meridian-type radio telescope BSA LPI are briefly described. Observation results for the coronal mass ejection (CME) and associated magnetic storm in November 2021 are presented. Scintillation enhancement started at a heliocentric distance of 0.7 AU 27.5 hours after the flare, the geomagnetic storm started 14.5 hours after the start of scintillation enhancement. The possibility of short-time space weather forecast by interplanetary scintillation monitoring data is demonstrated by the analysis results for this event.
$^1$P.N. Lebedev Physical Institute of the Russian Academy of Sciences
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