European Space Weather Week 2025

Characteristics of the June 2025 Forbush Decrease based on Observations from the Almaty Neutron Monitor (AATB)

Not scheduled

15m

Mon 27/10, Tue 28/10, Wed 29/10: Idun; Thu 30/10: Tonsalen

Poster SWR2 - Interdisciplinary Insights into Space Weather Events of Solar Cycle 25: From Solar Origins to Planetary Impacts SWR2 – Interdisciplinary Insights into Space Weather Events of Solar Cycle 25: From Solar Origins to Planetary Impacts

Speaker

Ms Botakoz Seifullina (Institute of Ionosphere)

Description

We report an analysis of the event recorded during 1-10 June 2025 by the AATB neutron monitor (Almaty, Kazakhstan; 3340 m a.s.l.; Rc = 5.9 GV). The cosmic ray intensity decreased by about 12%, classifying the event as a large Forbush decrease. The solar source of the disturbances was active region AR 14100, which produced a series of M3.4 and M8.1 flares on 30-31 May 2025, accompanied by fast halo coronal mass ejections (CMEs). Comparison of neutron monitor data with interplanetary parameters revealed a classical ICME structure, including a shock wave, a compressed disturbed plasma region, and the CME ejecta. The event was also accompanied by the development of a strong geomagnetic storm. These results demonstrate the close relationship between solar activity, the evolution of interplanetary CMEs, and the modulation of galactic cosmic ray intensity, underscoring the importance of an integrated approach to space weather diagnostics and forecasting.