22 citations · 96 across the 15 of their papers we have counts for
16 papers
On the simultaneity of Forbush decreases: the simultaneous effects of interplanetary parameters and geomagnetic activity indices
I. O. Eya, E. U. Iyida, O. Okike +9
Forbush decreases (Fd) are transient, short-term reductions in the intensity of galactic cosmic rays that reach the Earth's surface. When this reduction is observed at multiple loc…
Principal Component Analysis of Ground Level Enhancement of Cosmic Ray Events
R. E. Ugwoke, A. A. Ubachukwu, J. O. Urama +3
We applied principal component analysis (PCA) to the study of five ground level enhancement (GLE) of cosmic ray (CR) events. The nature of the multivariate data involved makes PCA…
Analysis of ground level enhancement events of 29 September 1989; 15 April 2001 and 20 January 2005
Romanius Ejike Ugwoke, Augustine Ubachukwu, Johnson Ozoemena Urama +3
We present the results of analyses of the ground level enhancements (GLEs) of cosmic ray (CR) events of 29 September 1989; 15 April 2001 and 20 January 2005. This involve examinati…
On the pulsar spin frequency derivatives and the glitch activity
Innocent O. Eya, Jibrin A. Alhassan, Evaristus U. Iyida +2
The number of sudden spin-ups in radio pulsars known as pulsar glitches has increased over the years. Though a consensus has not been reached with regards to the actual cause of th…
Testing the Simultaneity of Forbush Decreases with Algorithm-Selected Forbush Event Catalogue
J. A. Alhassan, O. Okike, A. E. Chukwude
Accurate detection and precise timing of transient events such as X-ray photons, γ-ray burst, coronal mass ejections (CMEs), ground level enhancements (GLEs) and Forbush decreases…
Investigation of the Relation between Space-Weather Parameters and Forbush Decreases Automatically Selected from Moscow and Apatity Cosmic Ray Stations during Solar Cycle 23
Jibrin A. Alhassan, Ogbonnaya Okike, Augustine E. Chukwude
We present the results of an investigation of the relation between space-weather parameters and cosmic ray (CR) intensity modulation using algorithm-selected Forbush decreases (FDs…
Testing the Effect of Solar Wind Parameters and Geomagnetic Storm Indices on Galactic Cosmic Ray Flux Variation with Automated-Selected Forbush Decreases
Jibrin A. Alhassan., Ogbonnaya Okike, Augustine E. Chukwude
Forbush decrease (FD), discovered by Scott E. Forbush about 80 years ago, is reffered to as the non-repetitive short-term depression in galactic cosmic ray (GCR) flux, presumed to…
Multi-Frequency Study of Spectral Indices of BL Lacertae Objects and Flat Spectrum Radio Quasars
E. U. Iyida, F. C. Odo, A. E. Chukwude +1
We present statistical analyses of a large homogenous data sample of Fermi-detected blazars thoroughly studied in order to reassess the relationship between flat-spectrum radio qua…
Radio Core-Dominance of Fermi-Blazars: Implication for Blazar Unification
E. U. Iyida, F. C. Odo, A. E. Chukwude
...The distribution of radio core-dominance is consistent with average projection angles of 13.5, 14.8, 16.8, 20.4, and 28.2 for ISPs, LSPs, FSRQs, HSPs, and radio galaxies, respec…
Spectral Properties of Fermi Blazars and their Unification Schemes
E. U. Iyida, F. C. Odo, A. E. Chukwude +1
We use the distributions of spectral indices of a large homogenous sample of Fermi-detected blazars to re-investigate the relationship between flat spectrum radio quasars (FSRQs) a…
Microglitches in radio pulsars: the role of strange nuggets
Innocent Okwudili Eya, Evaristus Uzochukwu Iyida, Johnson Ozoemene +2
Strange Nuggets are believed to be among the relics of the early universe. They appear as dark matter due to their low charge-to-mass ratio. Their distribution is believed to be th…
Entrainment factor on individual glitch fractional moment of inertia
Innocent O. Eya, Johnson O. Urama, Augustine E. Chukwude
The superfluid in the inner crust of neutron star is assumed to be the reservoir of momentum released in pulsar glitch. Recently, due to crustal entrainment, it is debatable whethe…
On the distributions of pulsar glitch sizes and the inter-glitch time intervals
Innocent O. Eya, Johnson O. Urama, Augustine E. Chukwude
The glitch size, , inter-glitch time interval, and frequency of glitches in pulsars are key parameters in discussing glitch phenomena. In this paper, the glitch si…
Formaldehyde and H110a observations towards 6.7 GHz methanol maser sources
Daniel. Okoh, Jarken. Esimbek, Jian. Jun. Zhou +4
Intriguing work on observations of 4.83 GHz formaldehyde (H2CO) absorptions and 4.87 GHz H110a radio recombination lines (RRLs) towards 6.7 GHz methanol (CH3OH) maser sources is pr…
On the Glitch Evolution of Pulsars
J. O. Urama, B. C. Joshi, A. E. Chukwude
Observations of pulsar glitches remain a powerful tool for studying the interior of neutron stars. Many of the observed glitch properties are shown to result from the evolution of…
Observations of microglitches in HartRAO radio pulsars
Augustine E. Chukwude, Johnson O. Urama
A detailed observation of microglitch phenomenon in relatively slow radio pulsars is presented. Our analyses for these small amplitude jumps in pulse rotation frequency () and/o…