Open AccessModulation effect of magnetic corotating trap on 27-day cosmic ray variation in November–December 2014
Author(s) -
В. Е. Сдобнов,
В. Е. Сдобнов,
М. В. Кравцова,
М. В. Кравцова,
Сергей Олемской,
S. V. Olemskoy
Publication year - 2019
Publication title -
solnečno-zemnaâ fizika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.11
H-Index - 2
ISSN - 2412-4737
DOI - 10.12737/szf-51201902
Subject(s) - physics , cosmic ray , neutron monitor , amplitude , astrophysics , interplanetary spaceflight , variation (astronomy) , interplanetary medium , coronal mass ejection , atmospheric sciences , solar wind , astronomy , nuclear physics , plasma , optics
We study the 27-day cosmic-ray (CR) intensity variation occurring in November–December 2014, using ground-based measurements from the worldwide network of neutron monitors and GOES-15 satellites. A determining factor in the considerable difference between amplitudes of the 27-day CR variation in November–December 2014 is shown to be significant changes in energy losses taking place when particles move in regular heliospheric electromagnetic fields. In this period, there was a long-living corotating trap produced by a vast coronal hole in the south of the Sun in interplanetary space. Configuration of this trap induced the energy loss of ~3–20 GeV CRs, due to which ground-based neutron monitors recorded an abnormally large amplitude of the 27-day variation.