R
Roslan Umar
Researcher at Universiti Sultan Zainal Abidin
Publications - 99
Citations - 1048
Roslan Umar is an academic researcher from Universiti Sultan Zainal Abidin. The author has contributed to research in topics: Radio astronomy & Radio telescope. The author has an hindex of 14, co-authored 91 publications receiving 814 citations. Previous affiliations of Roslan Umar include Universiti Teknologi MARA & University of Malaya.
Papers
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Journal ArticleDOI
The nonlinear least square fitting for rotation curve of orion dwarf spiral
Norsiah Hashim,Zamri Zainal Abidin,Ungku Ferwani Salwa Ungku Ibrahim,M. S. R. Hassan,Zety Sharizat Hamidi,Roslan Umar,Zainol Abidin Ibrahim +6 more
TL;DR: In this paper, a nonlinear least square fitting is used to fit the nonlinear rotation curve model with the observed rotation curve of the Orion dwarf galaxy, corrected for asymmetric drift by using the gradient method of nonlinear linear least square.
Journal ArticleDOI
Spatial Model of Sky Brightness Magnitude in KUSZA Observatory, UniSZA
Roslan Umar,Wardatul Jannah Awang,Siti Nadhirah Berzanji,Nur Farhana Abd Majed,Mohd Khairul Amri Kamarudin,Musa Garba Abdullahi +5 more
TL;DR: In this paper, the sky brightness of the KUSZA Observatory in Merang, Setiu, Terengganu, Malaysia was monitored using SQM device and the results obtained were used to compare with simulation data generated from Earth Observation Group (EOG) of National Oceanic and Atmospheric Administration (NOAA), National Geophysical Data Center.
Journal ArticleDOI
Effects of solar flares and coronal mass ejections on Earth's horizontal magnetic field and solar wind parameters during the minimum solar cycle 24
TL;DR: In this article, the authors investigated the response of the geomagnetic index SYM/H to the solar wind parameters, such as solar wind speed V, dynamic pressure P, input energy IE and the interplanetary magnetic field (IMF) Bz component, associated with solar flares and CME events.
Journal ArticleDOI
How to Deal with Radio Astronomy Interference
TL;DR: In this article, a minimum mapping technique for radio frequency interference (RFI) interference is proposed, which is based on GIS (Geographical Information System) for the selection requires gathering information for a variety of parameters such as rainfall, water lines and human activity.
Proceedings ArticleDOI
Implementing the GIS technique for RFI mapping for radio astronomy in Malaysia
TL;DR: The initial testing of the usage of the GIS system is reported to identify the areas with the lowest RFI in order to find the best site for the purpose of building a radio astronomical dish system in Malaysia, the first of its kind.