Magnetopause Reconnection Rate and Cold Plasma: A Study using SuperDARN

Details Magnetopause Reconnection Rate and Cold Plasma: A Study using SuperDARN Magnetopause Reconnection Rate and Cold Plasma: A Study using SuperDARN

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13d1627l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM13D-1627

Physics

[2731] Magnetospheric Physics / Magnetosphere: Outer, [2760] Magnetospheric Physics / Plasma Convection

Scientific paper

There is evidence that cold plasma associated with cold dense plasma plumes from the plasmasphere can decrease the reconnection rate at the magnetopause as the cold plasma convects towards the magnetopause. This is a system level problem as the rate at which flux is reconnected determines the flux content of the polar cap and hence the tail lobes, and could be important for controlling subsequent night time magnetospheric dynamics. Further the cold plasma from the plasmasphere has to reach the magnetopause and this happens as a consequence of the dynamics of the magnetosphere. This paper reports a study using SuperDARN of the convection flows in the ionosphere which are generated by the reconnection at the magnetopause and therefore are a direct measure of the reconnection rate. Northern hemisphere SuperDARN data are used in this study and we concentrate on intervals when there is data coverage in the local time sector 0900 to 1500 MLT. This ensures that we have complete flow measurements in that sector. Cold plasma density are taken from LANL measurements and have been sued in earlier studies of the impact of cold plasma on the reconnection rates. Initial results indicate a smaller impact on the ionospheric measurements than on the magnetic indices as in the earlier study.

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