Physics: Recent submissions
Now showing items 61-80 of 100
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Validating the use of scintillation proxies to study ionospheric scintillation over the Ugandan region
(Journal of Atmospheric and Solar-Terrestrial Physics, 2015-03)In this study, we compare the standard scintillation indices (S4 and σΦ) from a SCINDA receiver with scintillation proxies (S4p and sDPR||) derived from two IGSGPS receivers. Amplitude (S4) and phase (σΦ) scintillation ... -
Trends of ionospheric irregularities over African low latitude region during quiet geomagnetic conditions
(Journal of Atmospheric and Solar-Terrestrial Physics, 2016-01)The occurrence patterns of ionospheric irregularities during quiet geomagnetic conditions over the African low latitude region were analysed .GNSS-derived Total Electron Content of the ionosphere data during theperiod2001–2012 ... -
The Anomalous Low State of the X-ray Binary System Hercules X-1
(Doctoral dissertation, University of the Free State, 2008-08)The light curve of Hercules X-1 (Her X-1) shows a peculiar 35-day modulation of the X-ray flux cycling between low and high states. The 35-day modulation is believed to result from the occultation of the neutron star by a ... -
The Role of Astronomy in Development: The Case of Uganda
(International Astronomical Union, 2016)Science and technology play a key role in economic development; and Universities have a direct stake in this process. A knowledge-based economy requires scientific and technological expertise that is strongly influenced ... -
Review of small hydro-power technology
(Renewable and Sustainable Energy Reviews, 2013-05)This paper gives a review of small hydropower technology. Small hydropower (SHP) plant uses impulse or reaction turbines and is mainly ‘run-off-river'. SHP technologies currently used in generating electricity for rural ... -
Properties of flares and CMEs on EVLac: possible erupting filament
(Oxford University Press on behalf of the Royal Astronomical Society, 2020-10)Flares and coronal mass ejections (CMEs) are very powerful events in which energetic radiation and particles are ejected within a short time. These events thus can strongly affect planets that orbit these stars. This is ... -
Planet population synthesis driven by pebble accretion in cluster environments
(Oxford University Press on behalf of the Royal Astronomical Society, 2016-12)The evolution of protoplanetary discs embedded in stellar clusters depends on the age and the stellar density in which they are embedded. Stellar clusters of young age and high stellar surface density destroy protoplanetary ... -
Onset of Linear Instability in a Complex Plasma with Cairns Distributed Electrons
(Scientific Research Publishing, 2016-03)A rigorous theoretical investigation of linear dust ion acoustic (DIA) solitary waves in an unmagnetized complex plasma consisting of ion and ion beam fluids, nonthermal electrons that are Cairns distributed and immobile ... -
On the structure of quasi-Keplerian accretion discs surrounding millisecond X-ray pulsars
(Journal of Astrophysics and Astronomy, 2020-07)In this study, we investigated the time-independent dynamics (disc structure, forces and torques) of a quasi-Keplerian disc around a millisecond pulsar (MSP) with an internal dynamo. We considered the disc around a MSP to ... -
Traits of sub-kilometre F-region irregularities as seen with the Swarm satellites
(In Annales Geophysicae Copernicus, 2020-02)During the night, in the F-region, equatorial ionospheric irregularities manifest as plasma depletions observed by satellites, and they may cause radio signals to fluctuate. In this study, the distribution characteristics ... -
The Structure of a Quasi-Keplerian Accretion Disk around Magnetized Stars
(The Astrophysical Journal, 2018-06)In this paper, we present the complete structure of a quasi-Keplerian thin accretion disk with an internal dynamo around a magnetized neutron star. We assume a full quasi-Keplerian disk with the azimuthal velocity deviating ... -
Modelling the probability of ionospheric irregularity occurrence over African low latitude region
(Journal of Atmospheric and Solar-Terrestrial Physics, 2015-03)This study presents models of geomagnetically quiet time probability of occurrence of ionospheric irregularities over the African low latitude region. GNSS-derived ionospheric total electron content data from Mbarara, ... -
Modeling of ionospheric irregularities during geomagnetically disturbed conditions over African low-latitude region
(Space Weather, 2016-10)In this study, station-specific models of ionospheric irregularities over low-latitude African region during geomagnetically disturbed days (Dst ≤ −50 nT) have been developed. Global Navigation Satellite Systems (GNSS)-derived ... -
Modeling of GPS total electron content over the African low-latitude region using empirical orthogonal functions
(Annales Geophysicae Copernicus, 2019-01)In this paper, an empirical total electron content (TEC) model and trends in the TEC over the African low-latitude region are presented. GPS-derived TEC data from Malindi, Kenya (geographic coordinates 40.194_ E, 2.996_ ... -
Mediation Effect of Research Skills Proficiency on the Core Self-Evaluations – Research Engagement Relationship among Master of Education Students in Uganda
(Journal of Education and Practice, 2017)This study investigated the mediation effect of research skills proficiency on the relationship between core self-evaluations and research engagement among Master of Education students in Uganda. Questionnaire surveys ... -
KIC 5110739: A new Red Giant in NGC 6819
(Proceedings of the International Astronomical Union, 2018)The Kepler Input Catalogue (KIC) misclassified a number of red giant stars as sub giants. This could have resulted from the large uncertainties in the KIC surface gravities. This resulted in 1523 stars which were recently ... -
Determination of Natural Radioactivity Levels due to Mine Tailings from Selected Mines in Southwestern Uganda
(Journal of Environment and Earth Science, 2016)The aim of this study was to determine the natural radioactivity levels of primordial radionuclides in soil mine tailings from selected mines in Southwestern Uganda. This was achieved by analyzing thirty six samples of ... -
Climatology of ionospheric scintillations and TEC trend over the Ugandan region
(Advances in Space Research, 2013-12)This study presents results on the investigation of the diurnal, monthly and seasonal variability of Total Electron Content (TEC), phase (rU) and amplitude (S4) scintillation indices over Ugandan (Low latitude) region. ... -
On the possible contribution of ionospheric vertical drifts to TEC modelling in low latitudes
(Advances in Space Research, 2020-02)A single station empirical total electron content (TEC) model based on the Global Navigation Satellite System (GNSS) data during 2001–2015 is presented over the African low latitude region. For the first time, we have ... -
Non-Linear Ion-Acoustic Solitary Waves in Electron-Positron-Ion Plasma with Non-Thermal Electrons
(Scientific Research publishing, 2017-05)Ion-acoustic solitary (IAS) waves in electron-positron-ion (e-p-i) plasma have been of interest to many researchers probably due to their relevance in understanding the Universe. However, the study of non-linear ion-acoustic ...
