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Abstract
We present Cluster measurements of large amplitude electric fields correlated with intense downward field-aligned currents, observed during a nightside crossing of the auroral zone. The data are reproduced by a simple model of magnetosphere-ionosphere coupling which, under different conditions, can also produce a divergent electric field signature in the downward current region, or correlation between the electric and perturbed magnetic fields. We conclude that strong electric field associated with intense downward field-aligned current, such as this observation, is a signature of ionospheric plasma depletion caused by the downward current. It is also shown that the electric field in the downward current region correlates with downward current density if a background field is present, e.g. due to magnetospheric convection.
Original language | English |
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Pages (from-to) | 1876-1887 |
Journal | Journal of Geophysical Research: Space Physics |
Volume | 120 |
Issue number | 3 |
Early online date | 19 Mar 2015 |
DOIs | |
Publication status | Published - Mar 2015 |
Keywords
- magnetosphere-ionosphere coupling
- Cluster satellite
- ionospheric depletion
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Dive into the research topics of 'Magnetospheric signatures of ionospheric density cavities observed by cluster'. Together they form a unique fingerprint.Projects
- 1 Finished
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Complex Magnetic Fields: An Enigma of Solar Plasmas (joint with Durham University)
Hornig, G. (Investigator), Pontin, D. (Investigator) & Wilmot-Smith, A. (Investigator)
Science and Technology Facilities Council
1/04/13 → 30/06/16
Project: Research