Master’s Degree Awarded to Mr. Hilal Hasan Al-Jawhari in Physics

Mr. Hilal Hasan Ismael Ali Al-Jawhari was awarded a Master’s degree in the major of Physics for his thesis titled, “Nonlinear Propagation and Stability Analysis of Ion-Acoustic Waves in Relativistic Space Plasma,” which was submitted to the Department of Physics, Faculty of Science – Sana’a University. The defense was held on Saturday, October 18, 2025.

The MA Viva-voce Committee, which was formed based on a resolution issued by the Post-Graduate Studies and Scientific Research Council, consisted of the following:

#	Committee Members	Designation	Position
1	Assoc. Prof. Mohammed Ali Saif Ahmed	External examiner	Member
2	Prof. Mohammed Saleh Saleh Qusailah	Internal Examiner	Chair
3	Prof. Mahmoud Ahmed Hasan Khaled	Main supervisor	Member

The study aimed to conduct a precise study of the fundamental characteristics and instability of relativistic solitary waves.

The study reached several findings, including:

Only compressive Ion-Acoustic (IA) solitary waves are formed in the present plasma models with positive or negative heavy ions.
The relativistic phase velocity of Ion-Acoustic Waves (IAWs) decreases with increasing values of the relativistic factor β0.
The soliton amplitude increases with an increase in the relativistic factor β0.
The growth rate of the instability decreases with increasing magnetic field strength.

The study concluded with the following main recommendations:

Exploring ultra-relativistic and quantum systems.
Laboratory verification: Conducting well-diagnosed, magnetized relativistic plasma experiments.

The study was examined and recommended by the MA Viva-Voce Committee for acceptance and approval. The defense was attended by a number of academics, researchers, students, and interested individuals, in addition to the candidate’s colleagues and family members.