Ionospheric waves 

by

Dr Alicreance Hiyadutuje 

Date: February 11, 2025 from 11:00 AM West African Time (WAT)

Venue: Online via zoom (link is given below, check also https://lms.cesst.org/ ) 

Abstract 

The law of conservation of energy state that: “energy is neither created nor destroyed”, it can only change into different forms, that is called the transformation and/or can move from one place to another, that is known as the transfer. Most of the Earth’s magnetospheric energy input comes from the Sun as solar wind, Coronal Mass Ejections known as the CMEs, and solar flares. As a result this energy input, different phenomena may take place within the magnetosphere. Waves are examples of some of the phenomena that are caused by the space and/or terrestrial weather. Types of waves are given . For example, Atmospheric waves such as planetary, tides, and Atmospheric Gravity Waves (AGWs) are defined. AGWs, Perkins Instability and other mechanisms that cause the Travelling Ionospheric Disturbances (TIDs) are described. Groups of AGWs/TIDs are discussed. At the end of the presentation, other different mechanisms that can cause TIDs are discussed. Based on the previous results, we also discuss TIDs impacts on the High Frequency (HF) communication.

Biography of Dr. Alicreance Hiyadutuje 

Dr. Alicreance Hiyadutuje is a physicist specializing in ionospheric studies. He holds a Ph.D. from the University of Kwazulu Natal (UKZN). Professionally, Dr. Hiyadutuje has held various teaching positions, including teaching natural sciences and tutorial assistant and assistant lecturer in physics at different institutions. Currently, he is a Postdoctoral Researcher at the South African National Space Agency (SANSA), studying ionospheric irregularities. His research primarily centers on ionospheric disturbances during magnetic storms. Dr. Hiyadutuje's work has been recognized within the academic community, with publications in the Journal of Geophysical Research (JGR) and the Journal of Atmospheric and Solar-Terrestrial Physics (JASTP). He attended different conferences at SuperDARN, IUGG, IAGA-IASPEI, and AGU. Notably, he has explored the modulation of E-region near-range echoes by Traveling Ionospheric Disturbances also known as TIDs, as detailed in his publication "First Observations of E‐Region Near Range Echoes Partially Modulated by F‐Region Traveling Ionospheric Disturbances Observed by the Same SuperDARN HF Radar."

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