Dynamics of the AMPERE R1 Oval during substorms and SMCs

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Presentation transcript:

Dynamics of the AMPERE R1 Oval during substorms and SMCs L. B. N. Clausen1, J. B. H. Baker2, J. M. Ruohoniemi2, S. E. Milan3, B. J. Anderson4, and S. Wing4 1 Technical University of Braunschweig 2 Virginia Tech 3 University of Leicester 4 Johns Hopkins University Applied Physics Laboratory

Typical AMPERE Data: 2124-2134 UT on 12 December 2010 Clausen et al., 2012

Fitting a Bipolar Shape to Latitude Profiles of Current Density Clausen et al., 2012

MLT Fits to the R1 Oval in Both Hemispheres Northern Hemisphere Southern Hemisphere Strong Currents Weak Currents Clausen et al., 2012

R1 Oval Location vs. DMSP Particle Boundaries

Interhemispheric Variations of R1 Oval for Two Multi-day Events Non-Storm Storm-Time IMF Bz Sym-H AL Jnorth L0 L0(error) Jsouth L0 L0(error) Clausen et al., 2012

R1 Oval & Magnetospheric Modes Substorm (Themis list) SMC (courtesy J. Kissinger) Auroral Imager R1 Oval size Avg. R1 current R1 flux AU Index AL Index IMF Bz

Summary and Conclusions The AMPERE dataset provides widespread continuous observations of field-aligned current densities in both hemispheres simultaneously. A technique has been developed for fitting an MLT-profile to the Region-1 field-aligned currents to produce a radius for the “R1 oval”. An superposed epoch analysis of the behavior of the R1 oval during substorms and SMC events confirms the standard paradigm: The R1 oval expands and contracts during the substorm cycle The R1 oval remains reasonably steady during SMC events The R1 oval is therefore a valuable magnetospheric index!!!!

References Clausen, L. B. N., J. B. H. Baker, J. M. Ruohoniemi, S. E. Milan, and B. J. Anderson, “Dynamics of the region 1 Birkeland current oval derived from the Active Magnetosphere and Planetary Electrodynamics Response Experiment (AMPERE)“ J. Geophys. Res., doi:10.1029/2012JA017666, in press, 2012. Kissinger, J., R. L. McPherron, T.-S. Hsu, and V. Angelopoulos, “Steady magnetospheric convection and stream interfaces: Relationship over a solar cycle“, J. Geophys. Res., 116, A00I19, doi:10.1029/2010JA015763, 2011.

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