The Role of Nonlinear Magnetic Fields and Euler Potential in Dynamo Theory Revisited | Chapter 7 | Current Research Progress in Physical Science Vol. 3

 

This chapter reexamines the role of Euler potentials (EP) in magnetic dynamo theory. There is a link between the cross-product of gradients of the EP and magnetic field lines in a moving media [1]. However, its role and importance are a subject of debate, partly because of the anti-dynamo theorem of Cowling [2] and the stringent constraints obtained in 2D- and 3D- simulations [3]. This raises questions about the utility of such potentials in the broader magneto-genesis and dynamo theories. We reexamine this question in this chapter and find that a reinterpretation of such potentials may offer a new understanding of EP’s role in the evolution of magnetic field lines.

 

Author(s) Details

Bob Osano
Mathematics and Applied Mathematics Department, Cosmology and Gravity Group, University of Cape Town, South Africa and Centre for Higher Education Development, University of Cape Town, South Africa.

Please see the book here: https://doi.org/10.9734/bpi/crpps/v3/1372

3.55-keV Anomaly as the First X-ray Laser in Space| Chapter 10 | Research Trends and Challenges in Physical Science Vol.8

 Under near binary star systems consisting of a red giant and a neutron star, the 3.55-keV Ly-(alpha) line of the hydrogen-like 14Si can be created in a 6x1012 G magnetic field. 14Si ions in the magnetic column of binary neutron stars transmit this recombination radiation to the ground Landau level. In magnetic fields of 4x1012 – 1013 G, the Ly-(alpha) transition energy for hydrogen-like 14Si is computed. If the 3.55-keV line is a laser line, it can be seen up to z (leq) 100 red shifts. This line is most likely an X-ray candle produced by a large amount of silicon in these close binary systems in the universe. Due to the complicated geometry in such binary systems, the 3.55-keV line is unique. Other hydrogen-like ions can also emit laser radiation in the (1–20)-keV energy range. A laser line will always be narrowed. It is also mentioned that there are thermal X-ray sources in space that generate lines in the keV range.

Author(s) Details:

Vladimir Burdyuzha,
Nuclear Physics and Astrophysics Department, Lebedev Physics Institute, Russian Academy of Sciences, Moscow 117997, Russia.

Please see the link here: https://stm.bookpi.org/RTCPS-V8/article/view/6016