The Current Tension Electric Field in the Generalized Ohm's Law
| Autor: | Lei Luo, Xiaojun Xu, Liangjin Song, Meng Zhou, Zilu Zhou, Hengyan Man, Xing Wang, Yu Zhang, Peishan He, Siqi Yi, Hui Li |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | Geophysical Research Letters, Vol 51, Iss 4, Pp n/a-n/a (2024) |
| Druh dokumentu: | article |
| ISSN: | 1944-8007 0094-8276 |
| DOI: | 10.1029/2023GL107191 |
| Popis: | Abstract In the prevailing form of the generalized Ohm's law (GOL), −me/e(J/en)⋅∇(J/en) is often neglected. Because of the resemblance to the magnetic tension, we refer to this term as the current tension electric field (ECT). Our theoretical analysis reveals that ECT with a characteristic length of mi/me1/6λe dominates the electron inertia terms in the electron diffusion region (EDR) and is comparable to the electron pressure term in low‐βe conditions. Using particle‐in‐cell simulations, we demonstrate that ECT can contribute significantly to the reconnection electric field and energy dissipation at the boundaries of the inner EDR and in the outer EDR. Positive and negative J ⋅ ECT can be used to identify inner and outer electron diffusion regions, respectively. |
| Databáze: | Directory of Open Access Journals |
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