Coalescence of 2 current loops with a kink instability simulated by a 3-D EM particle code

K.-I Nishikawa, J.-i Sakai, J Zhao, Torsten Neubert, O. Buneman

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

We have studied the dynamics of a coalescence of current loops using a 3-D electromagnetic (EM) particle simulation code. Our focus is the investigation of kinetic processes such as energy transfer, heating of particles, and electromagnetic emissions associated with a current loop coalescence which cannot be studied by MHD simulations. First, the two loops undergo a pinching oscillation due to a pressure imbalance between the inside and outside of the current loop. During the pinching oscillation, a kinetic kink instability is excited and electrons in the loops are heated perpendicularly to an ambient magnetic field. Next, the two current loops collide and coalesce, while at the same time a helical structure grows further. Subsequently, the perturbed current, which is due to these helically bunched electrons, can drive a whistler instability. It should be noted in this case that the whistler wave is excited by the kinetic kink instability and not a beam instability. After two helical loop coalescence with tilting motions in the direction of left-hand rotation, the helical structure relaxes resulting in strong plasma heating mostly in the direction perpendicular to the ambient magnetic field.
Original languageEnglish
Title of host publicationSolar Flare, Coronal and Heliospheric Dynamics
PublisherPergamon Press
Publication date1995
Pages125-128
ISBN (Print)0-08-042644-1
DOIs
Publication statusPublished - 1995
Externally publishedYes
EventE2.2 Symposium of COSPAR Scientific Commission E on Solar Flare, Coronal and Heliospheric Dynamics, at the 13th COSPAR Scientific Assembly - Hamburg, Germany
Duration: 11 Jul 199421 Jul 1994
Conference number: 13

Conference

ConferenceE2.2 Symposium of COSPAR Scientific Commission E on Solar Flare, Coronal and Heliospheric Dynamics, at the 13th COSPAR Scientific Assembly
Number13
CountryGermany
CityHamburg
Period11/07/199421/07/1994
SeriesAdvances in Space Research
Number4-5
Volume17
ISSN0273-1177

Cite this

Nishikawa, K. -I., Sakai, J. ., Zhao, J., Neubert, T., & Buneman, O. (1995). Coalescence of 2 current loops with a kink instability simulated by a 3-D EM particle code. In Solar Flare, Coronal and Heliospheric Dynamics (pp. 125-128). Pergamon Press. Advances in Space Research, No. 4-5, Vol.. 17 https://doi.org/10.1016/0273-1177(95)00553-Q