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All Journal Journal of Multidisciplinary Applied Natural Science Indonesian Journal of Aerospace
Putri, Annisa Novia Indra
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Physics

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Cosmic Ray Intensity Analysis Based on the Earth’s Latitude and Hemisphere Putri, Annisa Novia Indra
Indonesian Journal of Aerospace Vol. 23 No. 1 (2025): Indonesian Journal Of Aerospace
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/ijoa.2025.9551

Abstract

The interaction between cosmic rays and solar activity has been extensively investigated,particularly in relation to how solar phenomena modulate cosmic ray intensity inthe heliosphere. The strength of cosmic rays absorbed by the Earth’s hemisphere is notuniform across the Northern Hemisphere (NH) and Southern Hemisphere (SH). This studywill include an investigation of cosmic ray intensity as recorded at various latitudes andhemispheres of the Earth. We employed nine cosmic ray stations in each NH and SH,separated into three types of latitudes: low, middle, and high. The method of percentagechange in cosmic ray intensity was used, which was evaluated during the HalloweenStorm phenomenon on October 29-30, 2003. The results showed that cosmic ray intensitydecreased more at high latitudes than at low latitudes in both hemispheres (NH and SH).Furthermore, the reduction in cosmic ray intensity observed in the NH was approximately1% greater than that observed in the SH. This can be attributed to the Rc value’s dependenceon latitude, variations in geomagnetic activity under different Interplanetary MagneticField (IMF) circumstances, and interplanetary space parameters such as the tilt of theHeliospheric Current Sheet (HCS).
Correlation of Solar Activity and Interplanetary Parameters on Cosmic rays Intensity Investigated through Multivariate Analysis from 1964 to 2020 Putri, Annisa Novia Indra; Herdiwijaya, Dhani
Journal of Multidisciplinary Applied Natural Science Articles in Press
Publisher : Pandawa Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47352/jmans.2774-3047.369

Abstract

This study investigated the relationship between the most influential solar and interplanetary plasma parameters and cosmic ray modulation. A principal component analysis (PCA) method was used. The variations of the cosmic ray intensity were obtained at 6 different locations with different latitudes and cutoff rigidities. These stations were located at mid- to high latitudes (SOPO, OULU, and NEWK), while the remaining three were located at low latitudes (MXCO, TSMB, and PSNM). A parameter ranking based on PCA confirmed that sunspot number, interplanetary magnetic field (IMF) magnitude, heliospheric current sheet (HCS) tilt, halo coronal mass ejection (CME) velocity, Bz, and proton density have the highest link with the modulation of cosmic ray intensity. Meanwhile, the PCA analysis at low latitudes revealed that the cone angle and the magnetic field components By and Bx along the y- and x-axes, the mean magnetic field of the Sun, the HCS tilt, and the IMF magnitude exert the greatest correlation on the cosmic ray intensity modulation at this station. The correlation between the analyzed parameters and cosmic ray modulation appears to vary with latitude.
Co-Authors Herdiwijaya, Dhani