activity
20092022
most citedDevelopment in Astronomy and Space Science in Africa

19 citations · 27 across the 9 of their papers we have counts for

collaborators

10 papers

astro-ph.SR2022

Effect of the Heliospheric State on CME Evolution

Fithanegest Kassa Dagnew, Nat Gopalswamy, Solomon Belay Tessema +2

The culmination of solar cycle 24 by the end of 2019 has created the opportunity to compare the differing properties of coronal mass ejections (CMEs) between two whole solar cycles…

astro-ph.EP2021★ 2 cited

The Total Solar Irradiance variability in the Evolutionary Timescale and its Impact on the Mean Earth's Surface Temperature

N. T. Shukure, S. B Tessema, N. Gopalswamy

The Sun is the primary source of energy for the Earth. The small changes in total solar irradiance (TSI) can affect our climate in the longer timescale. In the evolutionary timesca…

astro-ph.SR2020

Intercycle and intracycle variation of halo CME rate obtained from SOHO/LASCO observations

Fithanegest Kassa Dagnew, Nat Gopalswamy, Solomon Belay Tessema +3

We report on the properties of halo coronal mass ejections (HCMEs) in solar cycles 23 and 24. We compare the HCMEs properties between the corresponding phases (rise, maximum, and d…

astro-ph.SR2020

A comparison of CME expansion speeds between solar cycles 23 and 24

Fithanegest Kassa Dagnew, Nat Gopalswamy, Solomon Belay Tessema

We report on a comparison of the expansion speeds of limb coronal mass ejections (CMEs) between solar cycles 23 and 24. We selected a large number of limb CME events associated wit…

astro-ph.SR2020★ 3 cited

The shock driving capability of a CME inferred from multiwavelength observations

Fithanegest Kassa Dagnew, Nat Gopalswamy, Solomon Belay Tessema +4

The radial speed of a coronal mass ejection (CME) determines the shock-driving capability of a CME as indicated by the presence of a type II radio burst. Here we report on the Apri…

astro-ph.HE2019★ 2 cited

The Structure of a Quasi-Keplerian Accretion Disk around Magnetized Stars

Isaac Habumugisha, Edward Jurua, Solomon B. Tessema +1

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…