2016/07/18 by Manasvi Lingam, Amitava Bhattacharjee · 16 citations
Biochemistry, Genetics and Molecular Biology · Physics and Astronomy · #Action (physics) #Current (fluid) #Dynamo #Dynamo theory #Geomagnetism and Paleomagnetism Studies #Hall effect #Ionosphere and magnetosphere dynamics #Smoothing #Solar and Space Plasma Dynamics #Solar dynamo #Term (time) #astro-ph.GA #astro-ph.IM #astro-ph.SR #physics.plasm-ph
paper · pdf · doi:10.3847/0004-637x/829/1/51
published in The Astrophysical Journal 829(1), 51 (IOP Publishing) · 7 pages; 0 figures
arxiv created 2016/07/18 · openalex created_date 2016/08/23 · openalex publication_date 2016/09/20 · arxiv updated 2016/09/28 · openalex updated_date 2026/08/05
ABSTRACT The role of the Hall term on large-scale dynamo action is investigated by means of the first-order smoothing approximation. It is shown that the standard α coefficient is altered, and is zero when a specific double Beltrami state is attained, in contrast to the Alfvénic state for magnetohydrodynamical dynamos. The β coefficient is no longer positive definite, and thereby enables dynamo action even if α -quenching were to operate. The similarities and differences with the (magnetic) shear-current effect are pointed out, and a mechanism that may be potentially responsible for is advanced. The results are compared against previous studies, and their astrophysical relevance is also highlighted.