The Current Tension Electric Field in the Generalized Ohm's Law

Author:

Luo Lei12ORCID,Xu Xiaojun1ORCID,Song Liangjin34ORCID,Zhou Meng34ORCID,Zhou Zilu1ORCID,Man Hengyan1,Wang Xing1,Zhang Yu1,He Peishan1ORCID,Yi Siqi1,Li Hui25ORCID

Affiliation:

1. State Key Laboratory of Lunar and Planetary Sciences Macau University of Science and Technology Macao China

2. State Key Laboratory of Space Weather National Space Science Center, Chinese Academy of Sciences Beijing China

3. School of Physics and Materials Science, Nanchang University Nanchang China

4. Institute of Space Science and Technology, Nanchang University Nanchang China

5. University of Chinese Academy of Sciences Beijing China

Abstract

AbstractIn the prevailing form of the generalized Ohm's law (GOL), 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 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 JECT can be used to identify inner and outer electron diffusion regions, respectively.

Funder

National Natural Science Foundation of China

Publisher

American Geophysical Union (AGU)

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