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Simultaneous Optical and Radar Signatures of Poleward-moving Auroral Forms : Volume 18, Issue 9 (30/11/-0001)

By Thorolfsson, A.

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Book Id: WPLBN0004000629
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Simultaneous Optical and Radar Signatures of Poleward-moving Auroral Forms : Volume 18, Issue 9 (30/11/-0001)  
Author: Thorolfsson, A.
Volume: Vol. 18, Issue 9
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


APA MLA Chicago

Lester, M., Lockwood, M., Sandholt, P. E., Cerisier, J., Thorolfsson, A., & Senior, C. (-0001). Simultaneous Optical and Radar Signatures of Poleward-moving Auroral Forms : Volume 18, Issue 9 (30/11/-0001). Retrieved from

Description: Centre d'étude des Environments Terrestre et Planétaires, 4 avenue de Neptune, 94107 Saint-Maur CEDEX, France. Dayside poleward moving auroral forms (PMAFs) were detected between 06:30 and 07:00 UT on December 16, 1998, by the meridian scanning photometer and the all-sky camera at Ny Ålesund, Svalbard. Simultaneous SuperDARN HF radar measurements permitted the study of the associated ionospheric velocity pattern. A good general agreement is observed between the location and movement of velocity enhancements (flow channels) and the PMAFs. Clear signatures of equatorward flow were detected in the vicinity of PMAFs. This flow is believed to be the signature of a return flow outside the reconnected flux tube, as predicted by the Southwood model. The simulated signatures of this model reproduce globally the measured signatures, and differences with the experimental data can be explained by the simplifications of the model. Proposed schemes of the flow modification due to the presence of several flow channels and the modification of cusp and region 1 field-aligned currents at the time of sporadic reconnection events are shown to fit well with the observations.

Key words: Ionosphere (auroral ionosphere; plasma convection) - Magnetospheric physics 
(magnetopause; cusp and boundary layers)

Simultaneous optical and radar signatures of poleward-moving auroral forms


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