Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31c..04m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM31C-04
Other
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2760 Plasma Convection (2463), 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
Intervals of Steady Magnetospheric Convection (SMC) are loosely defined as times when convection in the magnetosphere is enhanced and there are no substorm signatures. There have been several quantitative definitions developed to detect SMC events. None of these methods, however, are based on observations of convection. SuperDARN is a useful tool for studying SMC, because it quantifies convection directly on a global scale. Previous SMC selection methods make use of ground based magnetometer responses to auroral electrojet currents. These magnetic observations are very useful, because they do not suffer from data gaps like radars do when the ionospheric propogation conditions are not ideal. The magnetometers have a disadvantage, however, in that they record a convolved response to both convection and conductivity. Previous SMC selection methods resulted in a strong seasonal bias in SMC occurrence due to seasonal changes in ionospheric conductivity. A new SMC selection criterion was developed to improve upon the previous criterion for enhanced convection. SuperDARN was used to evaluate the old and new selection methods. According to SuperDARN convection observations the new SMC selection criterion largely eliminated conductivity effects. Statistical studies reveal that the new SMC intervals have similar properties as events selected using traditional methods. Both SMC events sets have a moderate solar wind driver, enhanced convection, and stable polar cap size. Statistical studies also demonstrate that SuperDARN has good data coverage during SMC, unlike some other types of active magnetosphere phenomena. SuperDARN is therefore an excellent tool with which to study SMC.
McPherron Robert L.
McWilliams Kathryn A.
Pfeifer J. B.
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