Philippine Standard Time

Publications

October 11, 2023

Agricultural drought is a recurring problem in the Philippines, especially during El Niño year. In this study, the performance of satellite-based drought forecasts was assessed for the entire country to determine when and where the predictions are reliable. Metrics for evaluation included the accuracy, hit rate, and false alarm rate.

October 11, 2023

Recently, debris from rocket launches, as well as re-entering debris from orbit has been falling into Philippine territory. We need to understand the physical and chemical properties of these debris, to provide proper recommendations that will protect the lives and properties of Filipinos, as well as the Philippine ecosystems. In this study, we analyzed the morphology (physical) and the elemental composition (chemical) of samples from a rocket debris retrieved from a local coastal area. We performed the analysis using Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM-EDS) technology. Results from this study will help in improving PhilSA’s future warnings, as well as advance the research and operation activities of PhilSA related to space situational awareness.

October 11, 2023

Radial Acceleration Relation is the relationship between the total, and baryonic acceleration of a galaxy. The total acceleration is observed, while the baryonic acceleration is inferred through Modified Newtonian Dynamics (MOND) and other models. In this study, physical properties of 88 elliptical galaxies were taken from SDSS-DR16 MaNGA, an online database which provides data of galaxies such as mass, size, redshift, and velocity. Simple models are used, and are compared against other models from literature, to see if there is a fundamental constant in nature in which separates the dynamics of galaxies from standard Newtonian regime to MOND regime. Based on the results, it could be argued that elliptical galaxies are dynamically different from spiral galaxies, and that low mass galaxies have more dark matter compared to high mass galaxies.