Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0262t&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0262
Other
2431 Ionosphere/Magnetosphere Interactions (2736), 2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Monitoring the dayside ionospheric convection is of high importance because it shows the energy flux coming from the solar wind to the ionosphere. However, there is still no reliable method for measuring the dayside ionospheric convection driven directly by solar wind electric field. Two mostly known methods for monitoring ionospheric convection are based on (1) measuring magnetic disturbances near geomagnetic pole regions (the PC index), and (2) inferring the dayside ionospheric convection from SuperDARN measurements of ionospheric convection. However, the polar cap PC index does not measure properly the ionospheric convection due to a strong effect of substorm field-aligned currents on the magnetic field in the polar cap [e.g., Huang, 2005], and measuring the SuperDARN convection flow is strongly dependent on ionospheric conditions, so that reliable measurements of the ionospheric flow are available for short-time intervals only. For monitoring the dayside ionospheric convection we introduced a new index of geomagnetic activity. Since the magnetic effect of substorm current wedge is reduced with distance from substorm current wedge, for monitoring the dayside convection we used magnetic field measurements near the noon polar cap boundary, when the observatory was located far from substorm current wedge. Additionally, since the convection flow has an irregular character, we measured geomagnetic activity in all three magnetic field components. To test the results obtained, we used 15-min magnetic field data at two geomagnetic observatories, located near the polar cap boundary (CGL ~ 75 degrees). We calculated 15-min mean values of the new geomagnetic activity index and investigated the correlation between this index and both solar wind coupling function and other geomagnetic activity indices. We found very good correlation between this index and solar wind coupling function (correlation coefficient is as much as ~0.9). This index also well correlates with other geomagnetic activity indices.
Lyatsky Wladislav
Tan Aihong
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