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Strong Sunward Propagating Flow Bursts in the Night Sector During Quiet Solar Wind Conditions: Superdarn and Satellite Observations : Volume 20, Issue 6 (30/11/-0001)

By Senior, C.

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Book Id: WPLBN0004001093
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Strong Sunward Propagating Flow Bursts in the Night Sector During Quiet Solar Wind Conditions: Superdarn and Satellite Observations : Volume 20, Issue 6 (30/11/-0001)  
Author: Senior, C.
Volume: Vol. 20, Issue 6
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
-0001
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Senior, C., Parks, G. K., Rich, F., Cerisier, J., & Lester, M. (-0001). Strong Sunward Propagating Flow Bursts in the Night Sector During Quiet Solar Wind Conditions: Superdarn and Satellite Observations : Volume 20, Issue 6 (30/11/-0001). Retrieved from http://www.ebooklibrary.org/


Description
Description: Centre d’Etude des Environnements Terrestre et Planétaires (CETP), 4 Avenue de Neptune, 94107 Saint-Maur Cedex, France. High-time resolution data from the two Iceland SuperDARN HF radars show very strong nightside convection activity during a prolonged period of low geomagnetic activity and northward interplanetary magnetic field (IMF). Flows bursts with velocities ranging from 0.8 to 1.7 km/s are observed to propagate in the sunward direction with phase velocities up to 1.5 km/s. These bursts occur over several hours of MLT in the 20:00–01:00 MLT sector, in the evening-side sunward convection. Data from a simultaneous DMSP pass and POLAR UVI images show a very contracted polar cap and extended regions of auroral particle precipitation from the magnetospheric boundaries. A DMSP pass over the Iceland-West field-of-view while one of these sporadic bursts of enhanced flow is observed, indicates that the flow bursts appear within the plasma sheet and at its outward edge, which excludes Kelvin-Helmholtz instabilities at the magnetopause boundary as the generation mechanism. In the nightside region, the precipitation is more spot-like and the convection organizes itself as clockwise U-shaped structures. We interpret these flow bursts as the convective transport following plasma injection events from the tail into the night-side ionosphere. We show that during this period, where the IMF clock angle is around 70°, the dayside magnetosphere is not completely closed.

Key words. Ionosphere (Auroral ionosphere; Ionospheremagnetosphere interactions; Particle precipitation)


Summary
Strong sunward propagating flow bursts in the night sector during quiet solar wind conditions: SuperDARN and satellite observations

 

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