Detection of Coronal Mass Ejections (CMEs) in the Period of March‑May 2012 at Moussala Peak

Abstract

A large number of geoeffective solar events were registered during the period of March-May 2012. The events were detected as Forbush effects due to Coronal Mass Ejections (CME) occurring in March-April 2012 and a rare Ground Level Enhancement (GLE) in May, produced by region NOAA 1476 moderately strong (GOES class M5.1) flare at 01:25 UT on 17 May 2012 [ 1 ]. The data from permanently operational Cherenkov-water telescope of Basic Environmental Observatory at Moussala are used for observation of those activities. The magnetic IMF disturbances and resulting Forbush decreases were registered with high level of confidence. However, the GLE event detection was not confirmed statistically. The inter-comparison between detector responses of those events is used for preliminary study of the future space weather investigations in the Basic Environmental Observatory at Moussala.