Fleishman, G. D. and Pevtsov, A. A. (2018). Electric Currents in the Solar Atmosphere. In Electric Currents in Geospace and Beyond (eds A. Keiling, O. Marghitu and M. Wheatland). doi:10.1002/9781119324522.ch3
Electric currents in the solar atmosphere
|Author:||Fleishman, Gregory D.1; Pevtsov, Alexei A.2,3|
1Physics Department, Center for Solar-Terrestrial Research, New Jersey Institute of Technology Newark, NJ, 07102-1982, USA
2National Solar Observatory, Boulder, CO 80303, USA
3ReSoLVE Centre of Excellence, Space Climate research unit, 90014 University of Oulu, Finland
|Online Access:||PDF Full Text (PDF, 2.4 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2019100831728
American Geophysical Union,
|Publish Date:|| 2019-10-08
We review historical and modern studies pertinent to the measurements, modeling, and role of electric current in the solar atmosphere. We describe how the electric current density is computed from the vector magnetic field measurement at photospheric and chromospheric levels and how it is modeled, using Nonlinear Force‐Free Field (NLFFF) extrapolations, in the solar corona. Next, the roles of electric currents in plasma dynamics and heating, energy release, and acceleration and transport of nonthermal particles are discussed. We then consider some interesting properties of electron and ion components forming electric current in a multicomponent plasma, the effect of the electric current on the Alfvén wave properties, current neutralization, and redistribution during solar flares. We discuss present theories about the origin of electric currents from subphotospheric and photospheric motions. We conclude that evaluation of electric currents in the solar atmosphere has reached a high level of maturity and that accounting for the electric current is highly important for solar physics.
Geophysical monograph series
|Pages:||43 - 65|
Electric Currents in Geospace and Beyond
|Host publication editor:||
|Type of Publication:||
A3 Book chapter
|Field of Science:||
115 Astronomy and space science
This work was supported in part by NSF grants AGS-1250374 and AGS-1262772, NASA grants NNX14AC87G and NNX16AL67G to New Jersey Institute of Technology and RFBR grant 15-02-03835. A.A.P. acknowledges the financial support by the Academy of Finland to the ReSoLVE Centre of Excellence (project no. 272157) and NASA grant NNX14AE05G.
|Academy of Finland Grant Number:||
272157 (Academy of Finland Funding decision)
© 2018 American Geophysical Union. This is the peer reviewed version of the following article: Fleishman, G. D. and Pevtsov, A. A. (2018). Electric Currents in the Solar Atmosphere. In Electric Currents in Geospace and Beyond (eds A. Keiling, O. Marghitu and M. Wheatland). doi:10.1002/9781119324522.ch3, which has been published in final form at https://doi.org/10.1002/9781119324522.ch3.