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| Titel |
Earthward electrostatic field in thin current sheet. |
| VerfasserIn |
Lev Zelenyi, Anton Artemyev, Anatoli Petrukovich |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037363
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| Zusammenfassung |
| We provided experimental evidence for the existence of the earthward electric field in a thin
current sheet of the Earth’s magnetotail. This field plays an essential role in redistribution
between ion and electron components of the cross-tail current via the cross-field drift. We use
the statistics of 59 crossings of thin current sheet by CLUSTER spacecraft to show
that curvature and diamagnetic drifts of electrons can explain only a half of the
observed electron bulk velocity across the tail. This difference of electron velocities
is attributed to the Earthward electric field of the order of 0.05 mV/m, because
in the central region of the realistic current sheet the analogous effect of vertical
electric field vanishes due to non-zero normal component of magnetic field. The
corresponding effect is also manifested in the structure of ion distributions owing to the
negative shift of cold core of the ion distribution. We also present the theory of
earthward electric field formation based on difference of motion of magnetized
electrons and unmagnetized ions in the model of thin 2D current sheet.This work is
supported by RFBR grant 10-05-91001, NIII-472.2008.2 and programm OFN-15. |
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