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| Titel |
Electromagnetic dissipation during asymmetric reconnection with a moderate guide field |
| VerfasserIn |
Kevin Genestreti, James Burch, Paul Cassak, Roy Torbert, Tai Phan, Robert Ergun, Barbara Giles, Chris Russell, Shan Wang, Mojtaba Akhavan-Tafti, Ali Varsani |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250151125
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| Publikation (Nr.) |
 EGU/EGU2017-15677.pdf |
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| Zusammenfassung |
| We calculate the work done on the plasma by the electromagnetic (EM) field, ⃗J⋅⃗E′, and
analyze the related electron currents and electric fields, focusing on a single asymmetric
guide field electron diffusion region (EDR) event observed by MMS on 8 December 2015.
For this event, each of the four MMS spacecraft observed dissipation of EM energy at the
in-plane magnetic null point, though large-scale generation/dissipation was observed
inconsistently on the magnetospheric side of the boundary. The current at the null was carried
by a beam-like population of magnetosheath electrons traveling anti-parallel to the guide
field, whereas the current on the Earthward side of the boundary was carried by
crescent-shaped electron distributions. We also analyze the terms in Ohm’s law, finding a
large residual electric field throughout the EDR, inertial and pressure divergence fields at the
null, and pressure divergence fields at the magnetosphere-side EDR. Our analysis of
the terms in Ohm’s law suggests that the EDR had significant three-dimensional
structure. |
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