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Description
Muons are secondary particles formed by the interaction of a primary Galactic Cosmic Ray with the Earth's atmosphere, whose primary proton is influenced by a solar magnetic structure that travels throughout the heliosphere. This interaction between the primary proton and solar structures is known as Heliospheric Modulation of cosmic rays. The solar structures that cause the most intense cosmic ray modulation are the Interplanetary Coronal Mass Ejections (ICMEs), whose magnetic structure called Magnetic Cloud, have a helical magnetic field, which hinders the entry of cosmic rays inside the ICME, causing a decrease on the cosmic ray observations when this structure intercepts the Earth. The Forbush Diminution of cosmic rays was first linked to solar structure by S. E. Forbush in 1937, who had this phenomenon named in his honor for his discovery. In this sense, a detailed analysis of cosmic ray Forbush decrease observed by muon detectors on the Earth's surface is necessary to understand whether the polarity of the helical structure of the magnetic cloud plays an important role in the size of the decay and its recovery time.