Periodic Emission Within Jupiter's Main Auroral Oval
| Autor: | T. R. Robinson, Emma J. Bunce, Jonathan D. Nichols, Tim K. Yeoman, M. N. Chowdhury, Stanley W. H. Cowley |
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| Rok vydání: | 2017 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Field (physics) Oscillation Plasma sheet Magnetosphere Geophysics Astrophysics Plasma 010502 geochemistry & geophysics 01 natural sciences Jovian Jupiter Physics::Space Physics General Earth and Planetary Sciences Astrophysics::Earth and Planetary Astrophysics Ionosphere 0105 earth and related environmental sciences |
| Zdroj: | Geophysical Research Letters. 44:9192-9198 |
| ISSN: | 0094-8276 |
| DOI: | 10.1002/2017gl074824 |
| Popis: | We have discovered pulsating emission within Jupiter's main auroral oval, providing evidence of the auroral signature of Jovian ULF wave processes. The form comprises a 1° × 2° spot located directly on the main emission, whose intensity oscillates with a period of ∼10 min throughout the 45 min observation. The feature appears on the duskward edge of the discontinuity, maps to ∼13–14 h LT and ∼20–50 RJ, and rotates at around a half of rigid corotation. We show that the period of the oscillation is similar to the expected Alfven travel time between the ionosphere and the upper edge of the equatorial plasma sheet in the middle magnetosphere, and we thus suggest that the pulsating aurora is driven by a mode confined to the low-density region outside the plasma sheet. This significant new observation shows that Jupiter's auroras present an important remote sensing window on Jovian magnetospheric wave processes. |
| Databáze: | OpenAIRE |
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