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Electron Jet Detected by MMS at Dipolarization Front
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Zeitschriftentitel: | Geophysical Research Letters |
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Personen und Körperschaften: | , , , , , , , , , , , , , , , , , |
In: | Geophysical Research Letters, 45, 2018, 2, S. 556-564 |
Medientyp: | E-Article |
Sprache: | Englisch |
veröffentlicht: |
American Geophysical Union (AGU)
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Schlagwörter: |
Zusammenfassung: | <jats:title>Abstract</jats:title><jats:p>Using MMS high‐resolution measurements, we present the first observation of fast electron jet (<jats:italic>V</jats:italic><jats:sub><jats:italic>e</jats:italic></jats:sub> ~2,000 km/s) at a dipolarization front (DF) in the magnetotail plasma sheet. This jet, with scale comparable to the DF thickness (~ 0.9 <jats:italic>d</jats:italic><jats:sub><jats:italic>i</jats:italic></jats:sub>), is primarily in the tangential plane to the DF current sheet and mainly undergoes the <jats:bold>E</jats:bold> × <jats:bold>B</jats:bold> drift motion; it contributes significantly to the current system at the DF, including a localized ring‐current that can modify the DF topology. Associated with this fast jet, we observed a persistent normal electric field, strong lower hybrid drift waves, and strong energy conversion at the DF. Such strong energy conversion is primarily attributed to the electron‐jet‐driven current (<jats:bold>E ⋅ j</jats:bold><jats:sub><jats:italic>e</jats:italic></jats:sub> ≈ 2 <jats:bold>E ⋅ j</jats:bold><jats:sub><jats:italic>i</jats:italic></jats:sub>), rather than the ion current suggested in previous studies.</jats:p> |
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Umfang: | 556-564 |
ISSN: |
1944-8007
0094-8276 |
DOI: | 10.1002/2017gl076509 |