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Analysis of Ground Level Enhancement Events of 1989 September 29;2001April 15 and 2005 January 20

Research in Astronomy and Astrophysics 2022年第10期22卷 86-102页

作者： R.E.Ugwoke a.a.ubachukwu J.O.Urama O.Okike J.A.Alhassan A.E.Chukwude Department of Physics Federal University of Technology OwerriImo state Nigeria Department of Physics and Astronomy University of NigeriaNsukkaNigeria Department of Industrial Physics Ebonyi State UniversityAbakalikiNigeria

We present the results of analyses of the ground level enhancements(GLEs)of cosmic ray(CR)events on 1989September 29;2001 April 15 and 2005 January *** involves examination of hourly raw CR counts of an array of neutron monitors(NMs)spread across different geographical latitudes and *** awk script and computer codes implemented in R software,the pressure corrected raw data plots of the NMs were grouped into low-,mid-and *** results show both similarities and differences in the structural patterns of the GLE *** an attempt to explain why the CR count during the decay phase of GLEs is always higher than the count before peak,we interpreted all counts prior to the peak as coming from direct solar neutrons and those in the decay phase including the peak as coming from secondary CR neutrons generated by the interactions of primary CRs with the atoms and molecules in the *** identified NMs that detected these primary neutrons and found that they are close in *** authors seemingly identified these two species as impulsive and gradual *** there are a number of unexplained manifestations of GLE signals,some of the results suggest that geomagnetic rigidity effectively determines the intensity of CRs at low-and *** impact is apparently insignificant in high-latitude ***,the results presented should be validated before making any firm ***,the contributions of the ever-present and intractable CR diurnal anisotropies to GLE signals should be accounted for in future work.

关键词： Sun coronal mass ejections(CMEs)-Sun flares-Sun particle emission

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Principal Component Analysis of Ground Level Enhancement of Cosmic Ray Events

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Research in Astronomy and Astrophysics 2023年第3期23卷 155-169页

作者： R.E.Ugwoke a.a.ubachukwu J.O.Urama O.Okike J.A.Alhassan A.E.Chukwude Department of Physics Federal University of Technology OwerriImo StateNigeria Department of Physics and Astronomy University of Nigeria.NsukkaNigeria Department of Industrial Physics Ebonyi State UniversityAbakalikiNigeria

We applied principal component analysis(PCA)to the study of five ground level enhancements(GLEs)of cosmic ray(CR)*** nature of the multivariate data involved makes PCA a useful tool for this study.A subroutine program written and implemented in the R software environment generated interesting principal *** of the results shows that the method can distinguish between neutron monitors(NMs)that observed Forbush decreases from those that observed GLEs at the same *** PCA equally assigned NMs with identical signal counts with the same correlation factor(r)and those with close r values equally have a close resemblance in their CR *** results further indicate that while NMs that have the same time of peak may not have the same r,most NMs that had the same r also had the same time of *** the second principal components yielded information on the differences between NMs having opposite but the same or close values of *** that had the same r equally had the tendency of being close in latitude.

关键词： routine equally identical

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On the Lorentz factor of superluminal sources

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Research in Astronomy and Astrophysics 2013年第5期13卷 509-516页

作者： Chika Christian Onuchukwu Augustine A. ubachukwu Department of Industrial Physics Anambra State University Uli Department of Physics and Astronomy University of Nigeria Nsukka

We investigate the properties of features seen within superluminal sources often referred to as components. Our result indicates a fairly strong correlation of r ～ 0.5 for quasars, r ～ 0.4 for galaxies and r ～ 0.7 for BL Lac objects in our sam- ple between component sizes and distances from the stationary core. The assumption of free adiabatic expanding plasma enables us to constrain the Lorentz factor for su- perluminal sources. Our estimated Lorentz factor of y ～ 9-13 for quasars, 7 ～ 7-11 for galaxies and y～ 4 - 9 for BL Lac objects indicates that BL Lacs have the lowest range of Lorentz factors.

关键词： galaxies: general -- galaxies: active -- galaxies: jets -- methods: ana-lytical -- methods: statistical -- methods: data analysis

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