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The Ionospheric Response to Flux Transfer Events: the First Few Minutes : Volume 15, Issue 6 (30/11/-0001)

By Rodger, A. S.

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Book Id: WPLBN0003983417
Format Type: PDF Article :
File Size: Pages 7
Reproduction Date: 2015

Title: The Ionospheric Response to Flux Transfer Events: the First Few Minutes : Volume 15, Issue 6 (30/11/-0001)  
Author: Rodger, A. S.
Volume: Vol. 15, Issue 6
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Rodger, A. S., & Pinnock, M. (-0001). The Ionospheric Response to Flux Transfer Events: the First Few Minutes : Volume 15, Issue 6 (30/11/-0001). Retrieved from

Description: British Antarctic Survey, Natural Environment Research Council, Madingley Road, Cambridge, CB3 0ET, UK. We utilise high-time resolution measurements from the PACE HF radar at Halley, Antarctica to explore the evolution of the ionospheric response during the first few minutes after enhanced reconnection occurs at the magnetopause. We show that the plasma velocity increases associated with flux transfer events (FTEs) occur first ~100–200 km equatorward of the region to which magnetosheath (cusp) precipitation maps to the ionosphere. We suggest that these velocity variations start near the ionospheric footprint of the boundary between open and closed magnetic field lines. We show that these velocity variations have rise times ~100 s and fall times of ~10 s. When these velocity transients reach the latitude of the cusp precipitation, sometimes the equatorward boundary of the precipitation begins to move equatorward, the expected and previously reported ionospheric signature of enhanced reconnection. A hypothesis is proposed to explain the velocity variations. It involves the rapid outflow of magnetospheric electrons into the magnetosheath along the most recently reconnected field lines. Several predictions are made arising from the proposed explanation which could be tested with ground-based and space-based observations.

The ionospheric response to flux transfer events: the first few minutes


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