Convective response to a transient increase in dayside reconnection
| Autor: | William A. Bristow, James A. Slavin, J. Michael Ruohoniemi, George J. Sofko, Jean Paul Villain, K. B. Baker, Mark Lester, R. A. Greenwald |
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| Rok vydání: | 1999 |
| Předmět: |
Convection
Atmospheric Science Soil Science Magnetosphere Super Dual Auroral Radar Network Aquatic Science Oceanography Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Astrophysics::Solar and Stellar Astrophysics Earth-Surface Processes Water Science and Technology Line (formation) Ecology Northern Hemisphere Paleontology Forestry Magnetic reconnection Geophysics Space and Planetary Science Physics::Space Physics Magnetopause Astrophysics::Earth and Planetary Astrophysics Ionosphere Geology |
| Zdroj: | Journal of Geophysical Research: Space Physics. 104:10007-10015 |
| ISSN: | 0148-0227 |
| Popis: | Measurements with five of the northern hemisphere Super Dual Auroral Radar Network (SuperDARN) radars have yielded a detailed temporal and spatial view of the evolution of a dayside convection enhancement, which we associate with a transient increase in dayside reconnection. The convection enhancement was located in and immediately poleward of the ionospheric footprint of the cusp. During the enhancement, both the cusp and the region of enhanced flow shifted equatorward by ∼2°. As the flow enhancement diminished, the cusp footprint moved poleward to its original position. The entire event had a duration of ∼18 min and was associated with a transient 29 kV increase in the cross polar cap potential. We estimate that ∼3.2 x 10 7 Wb of magnetic flux was opened at the dayside magnetopause during the most active 12 min of this event. The length of the reconnection line on the dayside magnetopause is estimated to have reached 19,000 km. The characteristics of the dayside ionospheric response are very similar to those predicted by Cowley and Lockwood [1992] in their expanding and contracting polar cap model. These are the first observations that have provided an extended spatial and temporal view of the responses of dayside convection and the cusp to a transient reconnection event. |
| Databáze: | OpenAIRE |
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