Ion-scale Current Structures in Short Large-amplitude Magnetic Structures
| dc.contributor.author | Wang, Shan | |
| dc.contributor.author | Chen, Li-Jen | |
| dc.contributor.author | Bessho, Naoki | |
| dc.contributor.author | Hesse, Michael | |
| dc.contributor.author | Wilson III, Lynn B. | |
| dc.contributor.author | Denton, Richard | |
| dc.contributor.author | Ng, Jonathan | |
| dc.contributor.author | Giles, Barbara | |
| dc.contributor.author | Torbert, Roy | |
| dc.contributor.author | Burch, James | |
| dc.date.accessioned | 2021-07-27T18:56:11Z | |
| dc.date.available | 2021-07-27T18:56:11Z | |
| dc.date.issued | 2020-07-30 | |
| dc.description.abstract | We investigate electric current structures in Short Large-Amplitude Magnetic Structures (SLAMS) in the terrestrial ion foreshock region observed by the Magnetospheric Multiscale mission. The structures with intense currents(∣J∣ ~ 1m Am⁻²) have scale lengths comparable to the local ion inertial length (di). One current structure type is a current sheet due to the magnetic field rotation of the SLAMS, and a subset of these current sheets can exhibit reconnection features including the electron outflow jet and X-line-type magnetic topology. The di-scale current sheet near the edge of a SLAMS propagates much more slowly than the overall SLAMS, suggesting that it may result from compression. The current structures also exist as magnetosonic whistler waves with fci < f < flh, where fci and flh are the ion cyclotron frequency and the lower-hybrid frequency, respectively. The field rotations in the current sheets and whistler waves generate comparable |J| and energy conversion rates. Electron heating is clearly observed in one whistler packet embedded in a larger-scale current sheet of the SLAMS, where the parallel electric field and the curvature drift opposite to the electric field energize electrons. The results give insight about the thin current structure generation and energy conversion at thin current structures in the shock transition region. | en_US |
| dc.description.sponsorship | The research at UMCP and GSFC is supported in part by DOE grant DESC0016278, DESC0020058, NSF grants AGS1619584, NASA 80NSSC18K1369, and the NASA MMS mission. Work at Dartmouth College is supported by NASA 80NSSC19K0254. The work is also supported by the International Space Science Instituteʼs (ISSI) International Teams program. MMS data are available at MMS Science Data Center (https://lasp.colorado.edu/mms/sdc/). | en_US |
| dc.description.uri | https://iopscience.iop.org/article/10.3847/1538-4357/ab9b8b | en_US |
| dc.format.extent | 13 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2tbbg-re93 | |
| dc.identifier.citation | Wang, Shan et al.; Ion-scale Current Structures in Short Large-amplitude Magnetic Structures; The Astrophysical Journal, Volume 898, Number 2, 30 July, 2020; https://doi.org/10.3847/1538-4357/ab9b8b | en_US |
| dc.identifier.uri | https://doi.org/10.3847/1538-4357/ab9b8b | |
| dc.identifier.uri | http://hdl.handle.net/11603/22174 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | IOP Publishing | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Goddard Planetary Heliophysics Institute (GPHI) | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Ion-scale Current Structures in Short Large-amplitude Magnetic Structures | en_US |
| dc.type | Text | en_US |